Powdery mildew on cucumbers. Preparations and folk methods of combating the disease. How to deal with powdery mildew on cucumbers

rare household plot does without planting cucumbers, this culture has long won people's love. Growing cucumbers is a fairly simple and enjoyable activity, but if the disease is not recognized in time, all efforts will go down the drain, and the crop will be spoiled. How to deal with powdery mildew on cucumbers? First of all, you need to know the enemy in person!

Powdery mildew is fungal disease. The spores that cause it are transmitted from one plant to another. The infected parts of the plants are covered with a whitish coating, as if a little flour was scattered on the leaf. Over time, the “flour” becomes more, and the leaf itself fades, turns yellow and soon dies off. The first to suffer are those leaves that are located closer to the ground, gradually the infection moves up, capturing the entire plant, affecting not only the leaves and their petioles, but also flowers, ovaries, fruits. If the disease is not stopped in time, then most of the crop dies, and the surviving fruits develop poorly, they taste qualities spoiled.

Powdery mildew usually appears in early summer. This is facilitated by high humidity and heat, in such an environment, the fungus feels most comfortable.

Reasons for the appearance of fungus on cucumbers:

• an excess of nitrogen fertilizers;
• deficiency of phosphorus and potassium;
• sharp fluctuations in temperature;
• long rainy weather;
• excessive or, conversely, poor watering;
• as well as watering cold water at low air temperature;
• crop rotation is broken - cucumbers are grown in one area for several years;
• landing crowding;
• draft and insufficient lighting in the greenhouse.

What to do?

If you find whitish spots on the leaves of cucumbers, you need to urgently take action, because the disease is spreading rapidly! How to deal with the disease? First of all, this is timely prevention, but if the disease has already spread, then they begin treatment with chemicals or folk remedies.

Fungicides have proven effective in controlling powdery mildew and can be used in combination with traditional recipes.

Powdery mildew prevention

It is necessary to take preventive measures long before the start of sowing. In the fall, after harvesting, collect the remains of plants from the site, including not only the stems and leaves, but also the roots, and also carry out a deep digging of the soil. Disinfect greenhouses, greenhouses, working tools using a formalin solution.

If you've had fungus in the past, it's worth taking more careful precautions to prevent a recurrence next year. To do this, remove the top 5 cm layer of earth, dig and treat the soil with biological products. When the time comes for spring work, water the area with a solution of potassium permanganate.

Preventive measures:

• maintain proper crop rotation; ​​​​
• choose a sunny place protected from the cold wind for sowing cucumbers;
• strictly observe the recommended distance between plants;
• apply nitrogen fertilizers with care;
• it is better to give preference to phosphorus and potassium supplements;
• keep the temperature in the greenhouse at 20 degrees;

• water the cucumbers with warm water under the root;
• for preventive purposes, spray with Skor, Topaz, Fitosporin, etc.;
• effective preventive measures include periodic spraying of leaves with a solution of potassium permanganate. To do this, 3 g of potassium permanganate must be dissolved in 10 liters of water;
• for spraying, you can prepare a solution of furacilin - crush 10 tablets into powder and pour 5 liters of warm water.

You can grow cucumbers in the same area at intervals of 4 years.

At the moment, varieties and hybrids of cucumbers resistant to powdery mildew have been bred. It is important to understand that varieties that are completely insured against diseases do not exist, they only have increased immunity from pathogens. If precautions are not followed, they can also be infected with fungal spores.

The following varieties of cucumbers are resistant to powdery mildew:

• Anyuta F1
• Benefit F1
• Dear F1
• Blizzard F1
• Far East 27
• Crane F1
• Quadrille F1
• Competitor
• Robust F1
• Thumb boy F1
• Masha F1
• Ant F1
• Octopus F1
• spring
• Strumok F1
• Phoenix.

Fighting methods

Biofungicides

On the initial stages powdery mildew diseases, biological preparations that are safe for humans can be used. Cucumbers can be eaten immediately after treatment with such preparations. The composition of biological fungicides includes beneficial bacteria that can suppress and completely destroy the pathogenic fungus. For the treatment of powdery mildew, one treatment is not enough, they should be carried out several times with an interval of 5-7 days until the plants are completely healed.

Effective biological products:

• Alirin-B
• Gamair
• Fitosporin-M
• Planris.

Biofungicides are also good as a means of prevention, in this case two or three sprays are carried out with a frequency of 2 weeks.

Chemicals

If the disease has spread over a large area, heavy artillery - fungicide preparations - is called to help. Fungicides are chemicals long-acting, which effectively suppress the development of a harmful fungus. These drugs should be used with personal protection- a respirator or mask, gloves, goggles.

For processing plants, it is desirable to choose dry, calm weather. If necessary, re-spraying is carried out after 10 days.

Systemic fungicides:

• Topsin
• Topaz
• Thiovit Jet
• Fundazol

Chemical fungicides can be addictive in the pathogen, so you can not use the same drug all the time, it is better to alternate several drugs with each other.

Folk remedies

Folk recipes are good as preventive measures or with minor foci of the disease. In addition to a solution of potassium permanganate, infusions for spraying can be prepared from improvised and pharmaceutical products:

Parts of the plant completely spoiled by the fungus should be burned!

Folk recipes are good because they do not have a harmful effect on the fruits, cucumbers can be eaten immediately after spraying with such infusions. Ash and iodine infusions, a remedy with soda ash are considered absolutely harmless. Laundry soap, which can be successfully replaced with tar, a well-known pest control agent on personal plot. Thanks to fatty acids in its composition, it destroys all pathogenic flora, while not having a harmful effect on the human body.

However, it would be a mistake to assume that all means are completely safe. Colloidal sulfur, for example, is the same fungicide, it must be used with precautions - rubber gloves, goggles, a respirator, a hat.

downy mildew

In addition to powdery mildew, cucumbers are susceptible to peronosporosis (downy mildew). This is a dangerous fungal disease characterized by yellow spots on the leaves and a grayish coating on their reverse side.

With the course of the disease, the spots increase in size, the leaf dies off, with a strong lesion, almost all leaves fly around. Most often, the fungus appears in August, when prolonged rainy weather sets in. The most common reasons for this misfortune are the thickening of planting cucumbers, watering with cold water and sudden changes in temperature, when the difference between night and day temperatures is 15-25 degrees. Measures for the prevention of peronosporosis are in many ways similar to those discussed above.

The following hybrids have a certain level of resistance to peronosporosis:

• Alekseich F1
• Bouquet F1
• Delpina F1
• Grasshopper F1
• Thumb boy F1
• Ant
• Goosebump F1
• Moscow evenings F1
• Secret of F1
• steppe
• Farmer F1.

How to deal with peronosporosis?

If the first signs of the disease are found, watering should be stopped and the cucumbers should be treated with Bordeaux liquid.

• Kuprosat
• Ordan
• Oxychrome
• Previcur Energy
• Profit Gold
• Ridomil
• Topaz

It is advisable to cook warm solution preparations, and after processing, provide the plants with warmth - use a film to organize a mini-greenhouse.

Folk remedies for fighting fungus include:

• whey mix and blue vitriol , which is prepared as follows - 1 tsp. copper sulfate is dissolved in 7 liters of water and 3 liters of whey are added.
• sulfur solution- 50 g per 10 liters of water
• iodine with milk- 10 drops of 5% iodine mixed with 1 liter of milk and diluted with 9 liters of water.
• infusion onion peel - 300 g of husk pour 10 liters of water, boil, insist for two days.

Sick plants are sprayed with prepared solutions, if necessary, the procedure is repeated several times with an interval of 7-10 days.

Infected parts of plants must be destroyed, because the spores of the fungus are wintering, they can remain on infected plant remains, and therefore in the soil for up to 6 years!

The diseases discussed in the article are quite dangerous, however, if all precautions are observed, these diseases can be avoided. Do not forget to periodically inspect the leaves for suspicious spots and plaque, because in the initial stages the disease is easier to stop than the running one. The harmful fungus tends to spread rapidly, in a couple of days it can literally cover the entire area. But do not despair, the disease can be stopped with modern drugs or folk recipes that have been tested for centuries.

Good luck and rich harvests!

Powdery mildew on cucumbers is one of the most common diseases that causes a lot of trouble. If no action is taken against it, then the affected cucumber plantings will die, and there will be no harvest. In addition, in areas where plants were sick with powdery mildew, infection of new plantings is likely next year.

Powdery mildew is a fungal disease, the causative agents of which are located in the upper layer of the earth, on last year's plant residues, on dried weeds. They are not afraid of frost. They wake up in the spring when the air becomes warm.

A mandatory factor contributing to the activation of spores of this fungus is high humidity. In dry weather, powdery mildew rarely infects plants.

Spores are carried with the wind, with raindrops. They are attached to the leaves of cucumbers, most often to the lower ones. The leaf is covered with white rough spots, which at first have a small size. Then they grow, the sheet becomes completely white, and eventually turns gray, its edges fold to the top.

The fungus, under favorable conditions, quickly spreads throughout the plant, damaging stems, flowers, and cucumbers. The plant looks like it's covered in mold. The cucumbers are starting to rot. Cucumber plantings, the disease of which has developed to such a stage, die.

Causes of powdery mildew in cucumbers and the conditions when the fungus spreads most often:

• a sharp change in air temperature;
• frequent rains;
• watering with cold water;
• thickening of plantings, in which cucumbers are not ventilated and do not dry out for a long time after rain;
• dried parts of last year's plants are not removed from the garden in the fall;
• unkempt area overgrown with weeds;
• insufficient illumination of the beds by the sun;
• an excess of nitrogen in the soil, and a lack of phosphorus or potassium.

Methods for dealing with powdery mildew on cucumbers

Biological

"Albit" - the drug effectively acts on the fungus, regardless of weather conditions and temperature extremes. In addition to medical and protective properties has an immunostimulating effect, helps the plant recover from the action of chemical pesticides, promotes the formation of additional stems and the development of the root system.

"Alirin-B" - treats powdery mildew and other fungal diseases, restores the microflora in the soil, reduces the content of nitrates in fruits. When processing, soap should be added to the solution for better adhesion to the leaves.

"Gamair" - suppresses the action of pathogens of fungal diseases, restores the soil, reduces its toxicity, stimulates plant growth and improves immunity.

Biological preparations are used repeatedly, starting at the first signs of powdery mildew disease, and until the disease completely stops.

Chemical fungicides

If the spores have covered most of the plant, chemical fungicides should be applied.

• Bayleton - the protective effect lasts up to 4 weeks, depending on weather conditions;
• "Rayok" - the action begins 2 hours after treatment, the protection lasts about 7 days. Doesn't wash off with rain.
• "Thiovit - Jet" - the protective effect lasts up to 7 days, it can also be used to kill ticks;
• "Topaz" - the action lasts for 1-2 weeks, is used for prevention and treatment. It also has eradicating properties.

For the treatment of powdery mildew on cucumbers, the use of biological and chemical preparations can be combined. Chemical agents are considered more effective, while biological ones reduce their toxicity and restore plants from stress after an illness.

Folk remedies for the fight against powdery mildew on cucumbers

Folk remedies used for prevention or at the first sign of the appearance of the fungus. In a difficult situation, when the disease covers large plantations of cucumbers, and in addition to the leaves, stems and ovaries are infected, they are powerless.

• fermented milk products - yogurt, whey, kefir. Proportion: 1 part to 10 parts of water room temperature. Thoroughly stir and process the entire plant completely;
• soda ash - 1/3 teaspoon is diluted in 1 liter of water and a little soapy solution is added;
• wood ash - 1 liter jar ash per 5 liters of boiling water. Insist for about a day, filter, add liquid soap.

It is best to start using all these remedies when the weather begins to rain, or dew lasts for a long time in the morning, and fogs rise in the evening. Processed once a week, wetting all cucumber plantings and the ground near them with a solution. The disease can and will arise, but will not progress.

Prevention

If every year to carry out preventive measures, a fungal disease can be avoided completely.

Stages of preventive work:

1. In autumn, after harvesting, all plants are removed from the garden, leaving no roots.
2. If the cucumbers were sick this year, then the top layer of soil about 5 cm thick is removed.
3. The earth is being dug up.
4. Treat the soil with biological preparations.
5. In the spring, the area allotted for planting is spilled with boiling water or a strong solution of potassium permanganate. This will help get rid of not only powdery mildew pathogens, but also other diseases and pest larvae.
6. When fertilizing, it must be taken into account that an excess of nitrogen, or a lack of potassium and phosphorus, is a favorable environment for the development of spores.
7. For planting, seeds of varieties resistant to powdery mildew are used.
8. When planting cucumbers, you should observe the distance between them recommended for the selected variety. It is better to plant them rarely than to thicken them.
9. After the cucumbers grow up to 20 cm in height, preventive treatments with folk remedies or biological preparations should be started, and carried out regularly, at least 1 time in 2 weeks. In rainy weather, the interval between treatments should be reduced.

Powdery mildew resistant cucumber varieties

"Goosebump" - parthenocarpic (not requiring pollination) variety, the ripening period of the first fruits is 45 days. Up to 5 ovaries are formed in the sinus, fruit length is up to 12 cm. Without bitterness. Grown in open field, in greenhouses and greenhouses.

"Golubchik" is a bee-pollinated variety, the fruits ripen on the 50th day, the length of greens is up to 12 cm. Suitable for canning and pickles.

"Boy-with-finger" - small greens up to 10 cm, ripen on day 38, ideal for canning.

"Masha" - parthenocarpic, very early variety. The first fruits are ready for use on the 35th day, bear fruit for a long time. The length of cucumbers is up to 13 cm, without bitterness. Eat fresh, prepare for the winter. Grown in open ground.

"Benefis" is a self-pollinating variety. Fruit without bitterness. Ripens in 40-50 days. Suitable for summer food and preparations for the winter.

"Ibn-Sina" - parthenocarpic, for open ground. Ripens at 45 days. Cucumbers are long, up to 17 cm. There are 2-3 greens in one ovary. Used fresh.

"Alekseich" - parthenocarpic variety, gherkin fruits, up to 8 cm. Ripen in 40-45 days.

This is not a complete list of powdery mildew resistant cucumber varieties. When choosing a variety, you should also pay attention to:

• suitable for growing in your area;
• grows best in a greenhouse, or only in open ground;
• suitable for salting or consumed only fresh;
• greens length;
• fruit ripening period.

When growing F1 hybrids, you need to know that it is pointless to collect seeds from your cucumbers. The qualities and taste of mother plants are not transmitted through seeds collected from hybrids.

Video

Powdery and downy mildew appears on cucumbers in the form of spots and plaque. If you do not start taking action, then soon the cucumber lashes will begin to dry out and die. Therefore, it is necessary to know effective ways to prevent and combat these dangerous ailments.

powdery mildew

signs

If specks of rounded white or cream color- this is the beginning of a disease called "powdery mildew". Outwardly, the disease looks like the leaves and stems are sprinkled with flour. The causative agent is a fungus that develops on plant tissues. It can hit them from the moment the green mass grows.

White spots on the leaves of cucumbers are first found on the upper surface. They grow rapidly both in size and quantity. Merging, they move to the lower parts of the sheet, covering everything with powdery coating white color. The leaves affected by the disease turn pale, acquire a light yellow color, then turn brown, curl and dry. If treatment is not carried out, then the stems and even fruits become infected in the future. Cucumber lashes do not develop, are chlorotic in appearance, begin to die off gradually. The disease spreads rapidly and soon manifests itself like a white patch on cucumbers. Infected fruits are underdeveloped and tasteless, have no sugar content, and are often deformed. Later, the plant dies.

Causes

Mealy spots are an overgrown mycelium on which conidia are formed. They will serve as a source of infection in the future. The fungus overwinters on the remains and rhizomes of infected garden crops and weeds (thistle, chicory, plantain, etc.), and in spring the infection with drops of moisture falls on young cucumber leaves. The latent period of infection is very short - only 4-6 days.

A pathogenic fungus can give many generations in a season, so powdery mildew on cucumbers spreads rapidly and is quite difficult to remove.

If a cucumber beds located on the same plot of land for many years, the pathogen accumulates in large quantities in the soil. The infection can also get on cucumbers from plants planted nearby, carriers of the mycelium.

Distribution factors

Powdery mildew on cucumbers in a greenhouse is more common than outdoors. The vital activity of the fungus is very suitable for excessively humid greenhouse conditions and insufficient ambient temperature, which is especially typical for greenhouses and unheated greenhouses in early spring. Contributes to the disease and the presence of condensation on the walls and film.

An outbreak of the disease also appears with improper watering with cold water. If in the beds the decrease in yield reaches 50-85%, then in greenhouses the damage can reach up to 100%.

How to fight

To date, there are different ways to deal with the disease. Along with modern preparations for powdery mildew, gardeners do not forget about folk methods, rightly considering them more harmless and affordable. Let us consider in detail how to effectively process cucumbers if they are still sick. From powdery mildew, the following measures can help:

signs

This dangerous fungal infection, otherwise called peronosporosis, has recently spread widely and can affect cucumbers at any stage of growth.

Watch out for signs of downy mildew! If urgent measures are not taken, the landings will quickly die.

The causes and conditions for the spread of peronosporosis are similar to ordinary powdery mildew.

The fungus appears on the leaves as green-yellowish multifaceted spots that appear oily in appearance. Rapidly increasing in size, they capture the entire upper surface, and in the lower part appear as bluish purple bloom. What this type of fungal infection looks like can be seen in the photo.

The leaves begin to turn brown, as if the plant was burned with something. It will wither and dry out if not carried out in time. necessary processing cucumbers.

How to fight

It should be noted that it is more difficult to cope with peronosporosis than with ordinary powdery mildew. The main thing here is timely preventive maintenance and also prevent the disease from spreading. Good results are obtained in the following ways:

To save cucumbers from fungal infections, you must:

1. Timely remove old tops, plant remains and weeds around plantings.
2. Dig deep in the fall soil.
3. Plant seeds in the old place only after 3 years.
4. Alternate crops when growing, the best predecessors are onions, cabbage and legumes.
5. Plant varieties and hybrids that are resistant to the disease. The cultivation of early varieties and hybrids will also serve as protection. This way you can get away from a dangerous outbreak of the disease, which begins during the period of cool nights towards the end of summer.
6. Constantly maintain in greenhouses normal temperature and humidity level.
7. Watering, especially in cloudy weather, should be carried out only with warm water, and it is important to ensure that it falls strictly on the soil, and not on the leaves.
8. Follow the schedule of feeding with potassium and phosphorus, which increase the resistance of plants to infection and are a good prevention of powdery mildew in cucumber beds.
9. If Rizoplan is used as a prophylactic, then downy mildew on cucumbers may not spread further. When working with it, follow the instructions, but usually it will take only 2 tbsp for a bucket of water.
10. Greenhouses after the final harvest are treated with a solution of copper sulfate, based on a bucket of 3 tbsp. means, well shedding the soil. All infected plants are removed and burned outside the site.

Safety

In the fight against powdery and downy mildew on cucumbers, it is often necessary to resort to toxic drugs. There are a number of rules that must be observed when using them so as not to harm your own well-being:

1. Wear protective clothing, gloves and a mask when working.
2. Treatment with toxic substances is not carried out during the flowering of fruit and berry crops, so as not to kill pollinating insects.
3. Spraying is best done in cloudy weather so that the plants do not get burned.
4. Rinse all processed vegetables thoroughly with warm water before eating to wash off the remnants of the preparations.

As you can see, powdery and downy mildew are not so terrible if you know how to destroy them.

Vegetables, like people, are characterized by various diseases that affect their development and growth. The cucumber, beloved by gardeners, is also not completely immune from death. Prevention is a good thing, but sometimes vegetable diseases can be activated due to low temperatures or dampness. Knowing how to save the crop as soon as possible is necessary.

Diseases and pests of cucumbers

Vegetable crops are prone to various types of ailments, regardless of where they grow. There are diseases of cucumbers in the greenhouse and in the open air. The role of pathogens, as a rule, is played by fungi, but viral and bacterial lesions of plants and fruits are not uncommon. Mushrooms include:

• Various kinds of rot. Equipped greenhouse or growing cucumbers using ordinary film only helps the fungi in the soil to actively destroy crops. Both the roots of young cucumbers and parts of a grown plant can rot.
• Diseases, the symptoms of which are spots on the leaves and fruits. By the color of the plaque, it is not difficult to determine the infection with which disease has occurred, including powdery mildew. Such ailments develop well under conditions of high humidity, threaten to weaken seedlings up to the death of less resistant ones.

Cucumbers can become infected with bacteria by angular leaf spot. The uncomplicated name hides the possibility of losing half the crop. All parts of cucumbers during the course of the disease can be affected by dark brown spots of an angular shape. The leaves die first, the fruits, on the surface of which these symptoms are noticeable, bend and rot along with the seeds a little later.

A disease with a pleasant name, a mosaic, has a viral nature. Outwardly, it fully corresponds to its name, and its abilities make it possible to deprive gardeners of about half of the seedlings of almost any crop. Photosynthesis in the affected leaf plates is reduced, cucumbers stop growing. Helping viruses with their atrocities low temperature air, which middle lane may occur in summer.

Small pleasant water droplets that form in the morning on the grass have little to do with cucumber disease, although they are called similarly. Signs of powdery mildew can be considered white spots on the leaves of cucumbers. The causative agent of the disease is a fungus, after the time required for the spores to mature, a certain amount of liquid can be seen on gray-white spots. In rare cases, powdery mildew can affect the stalks and the fruits themselves.

In order not to grieve over the crop destroyed by powdery mildew, which was planted and fertilized with such difficulty, it is necessary to actively fight the pest. Sometimes everything can be limited only to preventive measures, but if it was not possible to avoid the disease, then it is necessary to treat the affected vegetable crops, preventing infection of healthy ones. There are several options for how to get rid of powdery mildew, each has both adherents and opponents.

Powdery mildew chemicals

Store-bought products aimed at a specific pest, in this case a mushroom, almost always completely cope with their task. However, since the composition contains chemicals, it is necessary to use drugs to combat powdery mildew according to the instructions. These types of funds fall into two categories:

• Fungicides. Powdery mildew preparations, produced in the form of powders, and sometimes immediately in the form of aerosols, are required to be sprayed on a diseased plant. Topaz and Thiovit Jet are popular among this category. In what proportions to dilute the powder or emulsion is clear from the description on the pack, but the product can only be used during the growing season.
• Biofungicides. A remedy for powdery mildew on cucumbers of this type will help only at the initial stage. Bacterial cultures from their composition stop the reproduction of harmful fungi. A huge plus of such preparations for powdery mildew is environmental safety, which allows the use not only during the vegetative period, but also during the appearance of fruits. Among the well-known are Fitosporin and Planriz.

Processing cucumbers from diseases with folk remedies

Homemade medicines made from improvised ingredients are considered less dangerous due to the lack of chemicals. Often shop options they are not inferior in performance. Here are some effective folk methods:

• Grated soap is mixed with iodine and milk. Approximately 20 g of soap and 25 drops of iodine will be required per liter of the milk component. Cucumbers are treated with the resulting solution once every one and a half weeks.
• Milk whey is diluted with water according to the proportions of 1 to 10. It is very important to achieve a uniform solution, then pour it into a spray bottle and process the cucumbers.
• Weeds can also do a good job: chop them finely, pour hot water according to 1: 1 proportions, leave for 3 days. When time is up, strain and drizzle over vegetables in the evening.
• Mix 4 g of soda and shabby soap in a liter of water. Achieve a homogeneous solution. Spray weekly twice a day.

Prevention methods

Regardless of whether vegetables are grown inside a greenhouse or not, powdery mildew on cucumbers can appear in all its glory. Preventive measures aimed at protecting crops can save future crops from death. In order not to have to treat cucumbers during the growing season or fruit ripening, you need to remember the following rules:

• Before placing young seedlings in the ground, make sure that there are no particles left inside. plant origin. The fact is that for the wintering of the fungus, the plants remaining after harvesting are the best fit. They must be removed and burned.
• Fertilizers are good in moderation! Those that contain nitrogen components in large quantities can do harm instead of good: help powdery mildew become more active.
• The causative agent of powdery mildew of cucumbers is sensitive to potassium and phosphorus. Feed cucumbers with fertilizers containing these elements.

Video: cucumber diseases and their treatment

To start active measures to combat powdery mildew, you need to identify the disease in time by external symptoms. To give a complete picture of what a cucumber ailment looks like, the photos and videos below will help. Often this disease can be mistaken for peronosporosis of cucumbers, commonly referred to as downy mildew. Experts in this field will tell you how to distinguish one from the other and how the treatment will differ.

Downy mildew on cucumbers - control measures

Powdery mildew of cucumbers

sovets.net

Treatment of cucumbers for powdery mildew

Powdery mildew disease causes a lot of trouble for the owners of garden and garden plots. This disease affects both vegetable crops and fruit trees and shrubs. It is not easy to prevent its appearance, it is even more difficult to get rid of it in order to save infected plants. But before using certain preparations for powdery mildew, you need to make sure that it is she who is the cause of the problems that have arisen.

Signs of powdery mildew damage

Business card powdery mildew - a whitish-gray coating. Thin and like dust at the beginning, it gradually begins to thicken and blacken over time. Small brown balls form on the upper side of the leaves. Diseased leaves dry up, the shoots are bent at the ends, darken and die.

Whitish mealy spots may appear on the leaves of roses, grapes or cucumbers. In the first stage, even before the formation of plaque, infected leaves become dull, lose their elasticity or wrinkle slightly.

Most often, the infection begins its destructive effect from those leaves and shoots that are near the ground. Gradually, it rises higher and captures the entire plant, including petioles and stalks. Infected fruits usually crack and rot.

Causes of Powdery Mildew

In order to find effective means from powdery mildew, one must clearly understand where and why it arises.

The spores of the fungus that causes powdery mildew in plants live in the soil. They are almost always there. But they begin to manifest themselves only under certain conditions. Yes, in the sun warm weather, with sufficient watering and optimal nutrition, plants rarely become infected with this fungus. But as soon as the ambient temperature drops to 12 - 15 ° C and stays that way for about a week, an alarming white coating begins to appear on the leaves.

Gardeners have long noticed that not all plants get sick. Even pampered cucumbers in a greenhouse can remain intact if they are not overfed with nitrogen and not exhausted by too much humidity. The fungus also does not settle where fertilizing was made on time and thinning was carried out.

What factors contribute to powdery mildew infection? As practice shows, this is:

Cool cloudy and damp weather when the air humidity exceeds 80%; - the presence of excess nitrogen in the soil; - strongly thickened landings; - the soil is often overdried, and then poured;

Watering is done when the topsoil is still wet.

The spores of the fungus awakened in this way can also be transmitted to other plants. They are easily carried through the air, along with water, even through the hands of a person who has touched an infected leaf or branch.

Powdery mildew prevention

Like most other plant diseases, powdery mildew is easier to prevent than to cure. Therefore, prevention is the first remedy against such a fungus. And any prevention is, first of all, the right agricultural technology. To minimize the risk of infection, you must:

Regularly thin out plantings; - remove old leaves in contact with the ground; - carry out watering of plants only after the top layer of the earth is completely dry; - do not abuse nitrogen fertilizers;

In time to carry out phosphorus-potassium top dressing.

Another type of prevention against powdery mildew can be carried out in early spring, before the leaves bloom. Berry bushes and other perennials are simply scalded with boiling water. This must be done quickly, using a watering can with a diffuser. All branches should be poured over as a whole, without lingering for a long time in any one place.

Short-term exposure to very hot water does not have time to harm plants that have not yet fully woken up after winter. But spores, mycelium, as well as pathogens of other diseases, die. A similar effect is exerted by a jet of steam under pressure, obtained using a household steam cleaner.

Powdery mildew treatment

For successful fight with powdery mildew, it is necessary to destroy not only the mycelium, but also the spores of the fungus. At the first signs of the onset of the disease, you should:

Completely eliminate any spraying; - refuse to fertilize those beds where affected specimens are seen; - if possible, improve the illumination of plants; - thin out plantings and remove all weak and old leaves, cut off flower stalks; - if the plant is in a pot or container, it is advisable to replace the soil in its upper part; - watering or dousing with the use of one or another means of powdery mildew;

Treat with a medicinal preparation not only the leaves, but also all the shoots and stems; potted plants you can simply dip into a basin, bath or other container filled with a solution.

For treatment, you can use proven folk remedies, or purchase ready-made chemicals.

Folk remedies for powdery mildew

1. Soap and soda solution:

Soda ash - 25 grams; - liquid soap - 5 grams;

Hot water - 5 liters.

Soda is dissolved in water, while soap is added. After cooling, the plants and the upper layer of the earth adjacent to them are sprayed. This should be done at least twice, with an interval of 7 - 10 days.

Another variant:

Baking soda - 1 tablespoon; - liquid soap - 0.5 teaspoon;

Water - 4 liters.

All parts are mixed well and the plants are sprayed 3 times at intervals of no more than a week.

2. Whey solution:

Serum - 1 part; - water - 10 parts.

The plants are treated 3 times at three-day intervals, so that a film forms on the leaves that prevents the mycelium from breathing. The tool is effective only in dry weather.

3. Decoction of horsetail:

Fresh horsetail grass - 100 grams; - water - 1 liter.

Horsetail is poured with water and kept for a day. Then boil on fire for two hours. Then they cool and filter. The resulting concentrate can be stored in a cool and dark place for about a week. Before spraying, the product is diluted with water in a ratio of 1:5. Processing is carried out three to four times every five days.

4. A solution of copper sulfate with soap:

Copper sulfate - 5 grams; - soap - 50 grams;

Water - 5 liters.

Soap is dissolved in warm water. Vitriol is diluted separately using a glass of hot water. A solution of vitriol is carefully combined with soap, pouring in a thin stream and constantly stirring. The resulting emulsion is treated with affected plants several times at weekly intervals.

5. Mustard solution:

Mustard powder - 2 tablespoons; - water - 10 liters.

Mustard is stirred in warm water. After cooling, you can either spray or simply water the plants.

6. Soap solution with ash:

Ash - 1 kilogram; - water - 1 bucket.

Water is heated to about 40 ° C and ash is poured into it. The solution is thoroughly mixed and infused for about a week. After that, they are drained, separating and removing the ash suspension collected at the bottom. Before spraying, add a little soap to the solution. It is necessary to process every other day or daily.

7. Infusion of rotted cow dung;

Rotted manure - 1 part; - water - 3 parts.

Manure is poured with cold water and left to infuse for at least three days. Before spraying, dilute with water twice.

8. Garlic infusion:

Garlic - 50 grams; - water - 2 liters.

The garlic is crushed and dipped in cold water. After standing for a day, drain and filter. The solution is used for spraying undiluted.

9. Copper sulfate and soda ash:

Copper sulfate - 80 grams; - water - 10 liters; - soda ash - 50 grams;

Water - 10 liters.

In the spring, even before bud break, they are sprayed with a solution of vitriol, and after flowering is over, with soda ash.

10. Colloidal sulfur solution:

Sulfur - 40 grams; - water - 10 liters.

The tool is well suited for spraying currants during periods of its growth. But we must remember that it cannot be used for gooseberries.

Special chemicals for powdery mildew

Topaz is a popular systemic fungicide used to treat and prevent fungal diseases. The active substance is penconazole. For spraying currants, gooseberries, grapes, cucumbers and strawberries, one ampoule is diluted in 10 liters of water. For flowers and pot crops - in 5 liters. Spray only with a freshly prepared solution, evenly wetting the entire plant. The treatment is repeated after about two weeks. The protective effect lasts up to 14 days. The drug belongs to the third hazard class - toxic to fish, but not dangerous to beneficial insects and birds. It is considered moderately dangerous to animals and humans.

Tilt KE is a systemic fungicide. It is used as a preventive and protective agent. The active substance is propiconazole. Available as an emulsion concentrate. It has a high duration of action, stops the further development of the disease, inhibits the formation of fungal spores. Elevated air temperature favorably affects the work of the drug, enhancing its effectiveness. "Tilt KE" has a high rain resistance, as it quickly penetrates into plant tissues.

A working solution with a concentration of 0.4 to 0.5 ml per liter of water must be prepared immediately before use. It is not recommended for use at air temperatures exceeding 29 ° C, accompanied by a humidity of less than 60%. The protective effect exceeds half a month and begins to appear within two hours after the end of treatment. Dangerous for fish and bees.

To combat the spread of powdery mildew, drugs are also used: Bayleton, Sulfarid, Fundazol, Previkur, Acrobat MC, Skor, Vitaros and others.

Diseases of cucumbers in the greenhouse

Cucumbers are a heat-loving crop that requires proper care, nutrition, shaping, watering and fertilization. Cucumbers also need protection from pests, diseases and weeds.

All the most common diseases are infectious.

Diseases and factors of their occurrence

Diseases that cucumbers in a greenhouse are susceptible to are associated with such factors:

• wrong conditions care for cucumbers in the greenhouse;
• the soil is used for a long time;
• incorrect selection of crops, in the neighborhood and predecessors;
• creation of an artificial microclimate;
• inability to grow cucumbers;
• drought;
• lack of nutrients, minerals and fertilizers;
• too much watering.

The most common cucumber pests are melon aphid, spider mite, sprout fly.

The most common cucumber diseases are:

• root and root rot;
• gray and white rot;
• withering;
• powdery mildew;
• ascochitosis;
• bacteriosis;
• downy mildew;
• olive blotch;
• brown spotting;
• anthracnose;
• alternariosis;
• black mold.

These are the most common cucumber diseases in the greenhouse, but, in general, there are many more of them. All of the above diseases are infectious. That is, they are passed from plant to plant. In this regard, it is necessary to take measures for disinfection, to fight the reproduction of infection. Cucumber pests most commonly found in greenhouses:

• melon aphid;
• spider mite;
• sprout fly.

Helpful Hints when growing cucumbers in a greenhouse

1. In no case should cucumbers be planted in the ground where zucchini, pumpkin and cucumbers grew.
2. Planting cucumbers should be alternated. The best precursors for cucumbers should be: potatoes, beans and tomatoes.
3. Cucumbers can be planted in the place where they have already grown before, not earlier than 3 years.
4. Cucumbers need to be watered only with warm water and only under the root.
5. Cucumbers should be tied up, otherwise they may face many fungal infections.
6. Before planting vegetables in a greenhouse, you need to prepare the soil for planting and the premises of the greenhouse. It must correspond to the correct temperature regime in summer, and in winter, and at night, and during the day.

Adhering to such simple rules, many problems can be avoided when growing cucumbers. To fight infectious diseases of vegetables, you need to know what signs this or that disease gives. You need to familiarize yourself with all the typical diseases, then it will be easier to treat plants. Each disease is treated in different ways, the principle of treating cucumbers, just like in humans, cannot be treated with one remedy. It is better to understand the cause and deeply study the disease, how it manifests itself and what it threatens. And only then treat. It happens that gardeners can treat cucumbers at random with some kind of solution, but the disease will not go away. It turns out that the waste of time and money will go to waste. In order to have a result, you need to have full knowledge of the information. Skill comes with experience. Before planting cucumbers, novice gardeners, all the more, need to study the characteristics of diseases and pests in order to protect and save the future crop.

Basal and root rot

The reasons for the appearance of white rot: high humidity in the greenhouse, poorly ventilated greenhouse and a large planting of vegetables.

a brief description of and signs of cucumber disease in greenhouses Roots and stems at the roots become brown, stained, dry, the leaves also become stained and lie on the ground. The roots can exfoliate, darken and dry. As a result, the plant stuns and dies. The source of the disease The causative agent of infection are pathogenic fungi that live in the soil. They can even be stored in seeds, and when planted, they begin to appear. Fungi infect both young plants and adults. Causes of the disease Infection can occur with a sharp temperature drop. If you pour cucumbers with cold water or hot water, then the risk of infecting the plant increases.

Gray and white rot

White rot.

Her signs:

If the stem becomes wet and covered with a white bloom like cotton wool, then this is white rot. It affects the stem and tops at the branching points. The causative agent of the disease is a polyphage fungus. It affects not only cucumbers, but also many other vegetables. Causes of the disease: high humidity in the greenhouse, poorly ventilated greenhouse and a large planting of vegetables leads to infection of cucumbers with white rot.

Gray rot.

Signs:

To combat gray rot in cucumbers, it is required to sprinkle the affected areas of plants with chalk, moisten with a solution of copper sulfate (0.5%).

Wet spots appear on the stem, fruits, flowers and leaves. There is a gray coating and black dots. The causative agent is the fungus Botrytis cinerea. Causes of the disease: gray rot, like white rot, appears due to low ventilation, high humidity in the greenhouse. Bacteria live on the greenhouse structure and in the soil.

Sprinkle the affected areas of plants with chalk, moisten with a solution of copper sulfate (0.5%). The soil infected with rot is selected and it is not allowed to plant cucumbers in this place for 2 years.

wilting plants

Signs:

To combat wilting, loosening of the soil under the plants and timely watering is required.

The leaves become sluggish, the plant lies on the ground. The stems turn white with a pink or white coating.

• pathogens are pathogenic fungi that penetrate the plant through the root;
• the cause of infection is too dense earth, not loosened. Roots in hard ground do not grow and develop well, water does not reach them, and therefore the plant is inhibited in growth, the fruits become small and not tasty.

Fight: Loosening the soil under the plants and timely watering is required to avoid wilting.

Powdery mildew on cucumbers

Pathogens infect the leaves of plants. The leaves are covered with a gray-pink bloom. Then black dots appear on the leaves, the leaf surface withers and dries, the plant dies. The source of bacteria is brought from the open ground.

Sources of infection are located near the doors, windows of the greenhouse and heating pipes.

The cause of this disease is a draft and a sharp temperature drop.

1. If signs of plaque appear, the plants are treated with a solution of potassium permanganate (2 g per 12 liters of water).
2. 250 g of onion peel is poured into 12 liters of hot water, infused for 1.5 days, filtered, and then plants are processed with infusion.

Ascochitosis

Signs:

Wet spots, black dots, watery places form in the root part of the plant, which cause the plants to dry out. The leaves first turn yellow, then dry up, and then the whole plant dies. The infection is transmitted through water, drops and air currents. The humidity of the air and the weakening of plants leads to the fact that bacteria multiply better.

Plant residues are removed. If it is possible to preserve the cucumber, then the plant is sprayed with a composition consisting of water, figon - 0.2%, cineba - 0.6%.

bacteriosis

The fight against bacteriosis of cucumber consists in spraying with Bordeaux liquid (1%) or using copper oxychloride (0.60%), cineba (0.60%).

The disease manifests itself as follows: black spots appear on the corners of the leaves. The corners dry up, and soon the entire leaf becomes damaged, covered in spots, sores and holes. The plant becomes like it was being pecked by birds. The infection spreads through drops of water. A good environment for the reproduction of bacteriosis is the air temperature from +16 to +20 degrees.

Control: plants are sprayed with Bordeaux liquid (1%) or copper oxychloride (0.60%), cineba (0.60%) is used.

downy mildew

The disease manifests itself as white round and angular spots on the leaves. A gray coating may appear on the stem and foliage. Diseased leaves become brittle and curl. With a strong infection, the plant dies. The infection is transmitted by droplets with high humidity and a temperature of +20 degrees.

1. Mix skimmed milk (1 l) with 8 l of water and add 10 drops of iodine 5%.
2. Ash (0.5 l) is brewed with 2.5 l of boiled water, infused for 30 minutes, more water is added to 8 l.

In the first and second variants, the plants must be sprayed with the resulting consistency.

Olive (brown) spotting

Most often, this disease affects the fruits of cucumbers and develops in greenhouses that are covered with film material. Bacteria live on the structures of cultivation equipment and structures. Spotting appears on the fruits in the form of spots, olive color and then the spots develop into sores. The plant stops growing.

Struggle: the greenhouse is fumigated for 2 days with the help of sulfur dioxide (sulfur checkers), thorough cleaning both inventory and everything where plaque is present. You can repeat if necessary.

Anthracnose

Another disease is called copperhead.

To get rid of anthracnose, cucumbers are sprayed with Bordeaux liquid (1.5%) or a 1% suspension of colloidal sulfur.

Appears on leaves, but also on stems. Signs are plaque spots, which then crumble the leaves. Spots may be single or may be numerous. Then the leaf turns black and falls off. Bacteria are transmitted through the air and droplets. May remain in seeds and plant debris in the ground or on the surface.

Control: all plant residues are removed, sprayed with Bordeaux liquid (1.5%) or 1% suspension of colloidal sulfur.

black mold

It is characterized by the formation of small spots, at first barely noticeable with black dots. Then the spots get bigger. Conditions for reproduction is high humidity. The disease leads to the death of the leaf and the death of the plant as a whole.

Fight: try to plant cucumbers in a drier place in the garden. It is better to water more often than to be left without a crop.

Cucumber pests in greenhouses

melon aphid

Pests in the greenhouse - aphids, sit on the inside of the leaf, on stems and flowers. After damage to the plant, the aphid helps it to curl up and the leaves fall off. Aphids carry diseases throughout the plants, thus they can infect the entire greenhouse. After damage to the plant, it slows down growth and dies.

Aphids and a means to combat it: treatment with a solution of laundry soap with lye, or you can take wood ash with soap. 100 g of soap, 200 g of lye, 200 g of wood ash and 10 liters of water.

spider mite

Fight against a tick: the plant must be treated with water, sprayed with a solution of water mixed with garlic. You also need to remove weeds.

Cucumber pests in greenhouse conditions- mites, sit on leaves and stems. After a leaf is bitten by a tick, it turns yellow, dries up and dies.

Fight against a tick: the plant must be treated with water, sprayed with a solution of water mixed with garlic. You also need to remove weeds, and in the fall it is good to dig up the soil.

growth fly

The fly is also a pest in the greenhouse. She lays her eggs in the soil. When sprouting cucumbers, the fly harms them the most. It feeds on the nectar of flowers, lays larvae and has three stages: egg, pupa and adult insect. After the disease of cucumber sprouts, they acquire a bluish color and soon die.

Fly control: treatment with chemical solutions. They need to spray young sprouts.

Disease and pest control

• when growing cucumbers closed ground you need to adhere to the correct temperature regime +18 at night and not higher than +26 during the day;
• sudden changes in temperature should not be allowed;
• well ventilate the room;
• when plants are damaged, they are removed, leaving only intact ones;
• a draft is an enemy for vegetables in a greenhouse. It must not be allowed;
• use fertilizers, organic matter;
• to protect the plants, you need to treat the entire area of ​​\u200b\u200bthe greenhouse with chemical fertilizers;
• Before planting, you need to prepare and cultivate the soil. In advance, in the fall you need to fertilize. In the spring, repeat the process;

In greenhouse conditions, vegetables are at risk of catching diseases in the same way as in open ground.

ParnikiTeplicy.com

Plant diseases: powdery mildew and downy mildew

The development of plants and the appearance of the crop are often hindered not only by pests, but also by various diseases: powdery mildew, peronosporosis, clamp rot, coccomitosis, anthracnose, rust and many other fungal diseases.

In this article, we will talk about how to deal with powdery mildew and the treatment of downy mildew (transferosis).

Powdery mildew is one of the most common fungal diseases affecting cucurbits. It is usually found in greenhouses and greenhouses, but under favorable weather conditions (high air temperature and humidity) it quickly spreads in open ground.

Peronosporosis affects cucumbers, melon, pumpkin, watermelon, as well as plants of the haze family. More often than other plants, parsley, parsnips, celery, dill, as well as cucumbers, zucchini, cabbage, peas, onions, and beets are infected with this disease.

Powdery mildew control measures and its photo

As you can see in the photo, powdery mildew is a white coating on the leaves and causes the plants to dry out. With severe damage, white spots also appear on the stem and fruits.

The rapid spread of powdery mildew in protected ground conditions is facilitated by sharp fluctuations in temperature, drafts, and watering plants with cold water. Outdoors, powdery mildew spreads rapidly with the onset of persistent hot weather and with the appearance of dew.

The causative agents of the disease persist on plant debris and on weeds.

In open ground, it is recommended to grow varieties resistant to powdery mildew. Plant residues, as well as diseased plants, should be burned or buried in the soil to a depth of at least 40 cm. In autumn, the soil must be carefully dug up and crop rotation observed, that is, plants should be planted in their original place no earlier than after 3 years.

One of the measures to combat powdery mildew is to smear the leaves and stems with ground or colloidal sulfur using a cotton swab. Further, if necessary, the plants should be treated with a suspension of colloidal sulfur or mullein infusion.

To prevent the disease, the temperature regime should be observed. The daytime temperature in the greenhouse should be 24-26 °C during the day, and 20 °C at night.

This fungal disease affects the leaves and stems of beans and peas, which turn yellow and dry out. At the same time, powdery plaque, consisting of fungal spores, is clearly visible on the affected organs. The disease can persist for a long time on plant debris. The development of infection occurs at an air temperature of 20-25 ° C and a relative humidity of 70-80%. To protect legumes from powdery mildew, sources of infection should be destroyed, as well as preventive measures should be taken, which include treating plants with sulfur preparations 2-3 times every 10-15 days.

How to deal with downy mildew and photos of peronosporosis

Peronosporosis affects the leaves of plants. It develops both indoors and outdoors and often leads to the death of plants.

Pay attention to the photo of downy mildew - at first these are oily spots on the leaves, which then turn into brown ones. On the underside, a purple coating of fungal spores is clearly visible. The pathogen can persist in soil and plant debris for 5-6 years. There are no varieties resistant to the disease.

The spread of peronosporosis is facilitated by high humidity and air temperature, therefore, to protect plants in protected ground, an optimal microclimate should be maintained. Air humidity should be no higher than 80%, and air temperature at night should not be lower than 20-22 °C. Downy mildew can persist in the soil and on plant debris, so autumn soil digging should be carried out and plant residues should be burned.

For guard cucurbits from peronosporosis they are sprayed with a 0.4% solution of copper oxychloride, a 0.4% solution of polycarbacin or Bordeaux liquid. To prepare it, mix 100 g of lime and 100 g of copper sulfate with 10 liters of water. Before planting in open ground, seedlings are recommended to be fed with ammonium nitrate.

When growing crops in greenhouses, it is important to avoid sudden temperature changes in them.

High air humidity is also harmful to plants under the film.

Photo gallery: powdery mildew and downy mildew (click to enlarge):

Powdery mildew on cucumbers

Signs of powdery mildew on cucumbers (see photo) are brown spots small size covered with white bloom (it is also called mycelium). At first, a small area is affected, but over time, the disease captures the entire leaf. It gradually becomes dull and dries completely. Cucumber seedlings affected by this disease do not develop, and educated young shoots no longer grow.

How to deal with powdery mildew on cucumbers? Protection is carried out by preparing a solution of weeds. To do this, you need the following material: plantain, coltsfoot, nettle, dandelion, wood lice, Ivan tea. All plants are crushed, placed in a bucket (usually the capacity is 10 liters) and filled with hot water. Next, add one teaspoon of urea, manganese powder, liquid soap and mix everything. And if the question arises - how to treat cucumbers from powdery mildew and other diseases, then the resulting solution is the best option for protecting plants.

In addition to a natural herbal cocktail for powdery mildew on cucumbers, folk remedies are used - whey and a mixture of mullein and urea in a proportion of 10 liters. water / 1 kg of cow manure with the addition of 1 tbsp. spoons of urea.

As a prevention of powdery mildew on cucumbers, fine sulfur powder is used (the soil is pollinated through a three-layer gauze and covered with a film for 3 hours). Also, in the fight against powdery mildew on cucumbers, a decoction of horsetail is used.

Preparation of tincture: 100 gr. dried or 1 kg of fresh horsetail is infused for about a day in 10 liters of water, then boiled for about 2 hours. After boiling, the broth should be cooled and diluted with water in a ratio of 1:5.

Thus, it is possible to significantly improve the process of growing cucumbers. Diseases are eradicated, and the soil becomes quite suitable for the safe growth and fruiting of plants.

Advice! In order to prevent the disease, diseased leaves and shoots should be burned immediately. Throwing them to the edge of the garden or garden is not recommended.

How to deal with downy mildew (downy mildew)?

The main sign of downy mildew on cucumbers (see photo) are yellow-green spots that cover most of the leaf. They are also mistaken for traces of acid rain. A purple-gray coating appears from the bottom of the leaf, as a result of which it dries completely and crumbles. Downy mildew of cucumbers affects plants regardless of age. It is typical in most cases when growing cucumbers in open ground.

Prerequisites for the emergence and development of peronosporosis are high humidity and air temperature up to 16-180C. The disease develops from small droplets on a leaf.

Spores are able to maintain their dangerous activity in the soil for a long time, so it is very difficult to deal with them. If peronosporosis or downy mildew appears on cucumbers, then control measures should include the use of certain preparations containing copper (Bordeaux liquid, Ridomil Gold, Oxyhom). These funds are effective as a prophylactic agent.

If cucumbers are affected by downy mildew, then the treatment is carried out with the drug "Rizoplan". It is based on living cells of some bacteria. They are absolutely harmless to humans, but fatal to downy mildew spores. The drug also does not accumulate in the soil, but decomposes immediately.

In addition to traditional preparations, you can apply from downy mildew on cucumbers and a folk remedy - whey. Leaves are sprayed with it.

How does olive blotch (cladosporiosis) appear on cucumbers?

The occurrence of olive spotting of cucumbers (see photo) should be observed in the second half of summer, when the cucumbers have already fully formed a bush. Olive blotch appears on fruits in the form of olive (brown) color spots with bloom. The disease spreads rapidly and if not treated, you can lose the entire crop.

This type of disease is more typical for greenhouse conditions. Cladosporiosis spores are resistant to the microclimate of the greenhouse, so the fight against this disease should be started immediately.

If olive spotting of cucumbers is observed, then control measures should include thorough wiping of all surfaces of the greenhouse with a disinfectant that does not contain chlorine. In no case do not water the cucumbers with cold water, and at the first detection of the disease, you should generally stop watering the plant for 3-4 days.

Treatment of cucumber disease in the open field is carried out through the use of solutions that contain copper - Bordeaux liquid with the addition of liquid soap.

In order to prevent the occurrence of olive blotch, a change of crops in the affected areas should be carried out.

What is an ordinary cucumber field mosaic?

Ordinary cucumber mosaic (see photo) most often develops in open soil. Signs of the disease are yellow-green spots in the form of a mosaic. With the development of the disease, the leaves of cucumbers curl, fade, dry out and crumble. The fruits become very pimply. Under the influence of the disease, the immunity of the plant is so weakened that with a sharp decrease in air temperature, the bush simply stops growing and soon dies.

The danger of this disease lies in its resistance to cold. Spores of an ordinary field mosaic easily survive winter and cold in the root systems of reserve plants (thistle, quinoa, wood lice, bindweed, wheatgrass). These are hard-to-remove weeds, so it is very difficult to fight this virus. You can apply the method of growing cucumbers in plastic bottles. It is absolutely not complicated and plants are not affected by field mosaic in 94% of cases.

How to spray cucumbers from the disease? With an ordinary cucumber mosaic, the treatment consists in spraying the bushes with whey. In especially severe cases, this is done with a concentrated substance, and in preventive measures ah and in the initial stages of the disease, serum should be diluted with water in proportions of 1:2. Treatment of cucumbers for diseases with folk remedies very often gives a positive and lasting result.

Green and white mottled mosaic

Green and white cucumber mosaic (speckled) is one of the most common infections. Signs of the disease are wrinkled leaves with blown out places, and areas with a green or white color also appear. Spots become white in a progressive stage. In this case, it is very difficult to fight the disease.

At the advanced stage, cucumber bushes dull their growth. Leaves weaken and begin to fade in places. The fruits, accordingly, become very soft, and their taste qualities deteriorate. An outbreak of the disease can be provoked by a sharp increase in temperature from 220C to 300C.

This dangerous viral disease is transmitted through an untreated tool, plant remains, and simply persists in the soil. To combat this disease, summer residents choose varieties that are resistant to the disease (mainly hybrids for open or closed ground).

The best measure to get rid of this disease of cucumbers is care. It is necessary to remove the affected shoots and leaves in time and burn them immediately. Also, for prevention, you can spray the bushes with a light solution of whey.

How to deal with gray cucumber rot?

Gray rot on cucumbers (see photo) is a type of viral disease that manifests itself during their active fruiting. A gray coating may appear on leaves, stems and fruits, especially in internodes. The most favorable environment for its development is a densely planted area of ​​\u200b\u200bthe garden or garden.

The fact is that cucumbers that grow in close proximity to each other begin to rot due to the inability to develop in close quarters.

How to deal with gray mold on cucumbers? The therapeutic measure is the timely removal of diseased leaves and entire sections of the stem. In some cases, it is necessary to remove the entire hive. The fight against gray rot on cucumbers also consists in applying to the wounds of the removed sheets of a specially prepared substance (chalk with potassium permanganate). The consistency of such a remedy should be viscous and have a light pink tone.

Root rot of cucumbers

The danger of cucumber root rot (see photo) is that the signs of the disease are not immediately visible, since it affects the root system of the plant. The first sign of this disease is a sharp wilting of the bushes. In this case, you can not start watering the plant, this will harm it even more.

How to save cucumbers from root rot? In the early stages of the manifestation of the disease, the root system should be slightly exposed (for this you need to slightly loosen the soil around it). Treatment of root rot of cucumbers consists in sprinkling the affected parts with a specially prepared composition (charcoal, chalk and ash). A solution of copper sulfate and copper oxychloride can also help with root rot of cucumbers.

After therapeutic measures, the roots and part of the stem should be sprinkled with clean, dry and unaffected soil. Watering can be started at the first sign of improvement in plant growth.

main-dacha.ru

how to cure a cucumber plant from powdery mildew in protected ground?

Linda

Spray with fungicide

Nikitich

Downy mildew. The development of the disease is promoted by high humidity at high temperatures. The infection persists in the soil on plant debris. It is difficult to defeat powdery mildew, but it is possible if you use the entire set of preventive and eradicating agents.

First of all, this is the observance of garden crop rotation when growing cucumbers in open ground, and in closed ground, if there are two greenhouses, alternately growing cucumbers and tomatoes in them. Of no less importance is the cleaning of greenhouses and greenhouses in the fall from plant residues and weeds and their immediate destruction, followed by disinfection of the entire greenhouse with bleach or fumigation with sulfur briquettes. Deep autumn digging of the soil is also of great importance.. .

Galina Kurmaeva

you can sprinkle with manganese

bbbbbbbbb

The drug of systemic action - TOPAZ, helps 100%.

Svetik

Pouring warm water under the root maybe? I grow everything outdoors. I also get covered with some kind of yellowness - like bubbles, it looks like rust .... And then all the leaves dry up even. I don't know what disease it is. We are told - the dew is bad or the fog has taken it. There is nothing to do - the end of the cucumbers comes - the deadline has already passed for them. And we calm down. Since that time, the yield of cucumbers is low, and then completely disappears. Maybe try Topaz? And what kind of disease I have - I do not know.

Rodionov Sergey

treatment is rather difficult since the use of fungicides excludes the use of fruits for food. it is much easier to prevent this disease and apply varieties resistant to this disease; now the choice is quite wide. treatment in any case will greatly reduce the yield and further keeping the plants in the greenhouse will no longer be economically feasible. maybe you should think about changing the plants grown so as not to waste time?

Olga Malysheva

I know that before the start of intensive fruiting, for the prevention of peronosporosis (false powdery mildew), it is necessary to spray the plant with a preparation of copper (oxych). How about a cure? I think that the affected plant should be removed in order to save the rest, stop watering, ventilate the greenhouse well, and scatter ash or chalk over the soil to dry it. Leaves can also be powdered with ash. Or spray the plant with iodine (10ml per 10l of water). It helps currants, and tomatoes from phytophthora. And Sveta, I think, has bacteriosis on cucumbers, and Fitosporin should be sprayed.

Spring Melody

Old people taught: to water cucumbers after harvesting with a solution of brilliant green, 10 drops per bucket of water. You can start early for prevention. Checked. Works.

vyrastisad.ru

Powdery mildew on cucumbers: effective ways to fight

Favorable factors for the spread of the virus are warm and damp weather conditions. 3–4 days after heavy rainfall, outbreaks of powdery mildew can already be observed on cucumbers. She prefers temperatures in the range of 16–22 degrees and a high degree of humidity. Spore formation also requires an abundance of light. A decrease in the immunity of vegetable crops to pathogenic effects is facilitated by sharp changes in day and night air temperatures.

The causative agents of the virus often remain to live in last year's plant debris that overwintered on the site.

signs

Contribute to the infection of plantings with ashtray certain conditions plant content:

• cool and damp weather;
• thickened in excess of the landing rate;
• high nitrogen content in the soil structure;
• excessive drying and subsequent flooding of the earth;
• watering the site at a time when the topsoil is still quite wet.

The hallmark of the disease is a white fluffy coating on the surface of the foliage. The first signs of damage to cucumbers by a spore-bearing fungus are round whitish spots or reddish light ones. First they can be seen on the top of the sheet, and later on the bottom. Over time, they populate all green areas, up to shoots and roots. Some whips in the event of a severe defeat are able to dry out. The leaves become twisted, have a loose surface. Plants are weakened, there is an acute lack of oxygen, which often provokes their death.

Highly favorable conditions for the appearance of ashtrays, there are inside the greenhouse. There, the air humidity can go off scale up to 80% and there is drip moisture. The first signs of the disease can be observed near the open windows. Often it is possible to see the disease on the foliage of cucumbers, less often it is deployed on the cotyledons. The infection spreads from leaves and shoots located close to the soil surface. Fruits infected with the virus are prone to cracking and rotting.

Video "Signs of powdery mildew on greenhouse cucumbers"

See what greenhouse cucumbers look like, the leaves of which are affected by powdery mildew.

How to fight

As soon as you notice the first signs of the disease, you should immediately take action. Before starting the treatment of plants, it is necessary to exclude any types of spraying, stop fertilizing, improve the degree of illumination of plantings, thin them out and remove old, as well as weakened leaves, cut off flower stalks. After such manipulations, it will be possible to fight effectively not only with the mycelium, but also with the spores of the fungus.

Modern gardeners and gardeners often use chemicals to fight fungal infection:

• Topaz, which is used by many to fight the virus, is a popular systemic drug, the active ingredient of which is penconazole. It is used for treatment at the rate of 1 ampoule of funds per 10 liters of water. Spray should be freshly prepared solution. The frequency of treatments is every 2 weeks. The drug in the process of treating plantings is moderately dangerous for human and animal health.
• Tilt CE for plant treatment with the active ingredient propiconazole is offered in a convenient emulsion form. It tends to suppress the formation of spores. The effectiveness of the drug is enhanced by high temperature environment. The agent quickly penetrates into the tissues of the plant. A solution to combat the disease is prepared at the rate of 0.4 - 0.5 ml of the drug per 1 liter of water. The protective effect shows a few hours after treatment and lasts more than 2 weeks. The product is dangerous for bees and fish.

You can also treat vegetable plantings to fight a fungal infection with Sulfarid, Bayleton, Fundazol, Previkur, Skor, Vitaros, Acrobat MC preparations. In the initial stages of the disease, it is permissible to fight the disease with sulfur-containing drugs, such as Thiovit Jet or VDH. Effective and copper-containing - oxychloride, Bordeaux liquid in the proportion of 1 teaspoon per 10 liters of water.

quite varied and folk methods struggle, which have proven themselves among gardeners for many years.

A soap-soda solution has always helped to get rid of a fungal infection. For its preparation, 5 grams of liquid soap, 25 grams soda ash for 5 liters of boiling water. It will be necessary to process the plants several times, after a break of 7-10 days.

Used to combat the disease and whey solution at the rate of 1 part per 10 parts of water. Processing is done 3 times with an interval of 3 days.

Decoction horsetail- 100 grams of horsetail per 1 liter of liquid. It is not difficult to prepare it. Horsetail is poured with water and aged for a day. It cools and strains. Before spraying it is diluted with water in a ratio of 1:5. Plants are sprayed with it 3 times every 5 days.

Copper sulfate in the amount of 5 grams is combined with 50 grams of soap and 5 liters of water. The resulting emulsion should be treated with landings at least 2 times, taking a break of 1 week.

A mustard solution will also help in the treatment. For its preparation 2 tablespoons mustard powder stir in 10 liters of warm water. Next is watering the vegetables.

Among folk methods of struggle, processing cucumbers with a solution of soap and ash is popular. It will require 1 kg of ash per 1 bucket of water. The solution should be infused for about 1 week. Before processing, which will be carried out every day or every other day, add a little soap.

A solution of rotted mullein will also come to the aid of cucumber plantings - 1 part to 3 parts of water. It is insisted for about 3 days. Before use, dilute with water, increasing the volume by 2 times.

Infusion of garlic - 50 grams per 2 liters of water. Garlic is crushed, placed for 1 day in cold water, then filtered.

Another recipe for fighting the disease is 80 grams of copper sulfate, 50 grams of soda ash, 10 liters of water.

You can try treatment with a solution of colloidal sulfur. To prepare it, you need 40 grams of sulfur per 10 liters of liquid.

In addition to powdery mildew, downy mildew, called penosporosis, is also distinguished. It is distinguished from powdery mildew by the presence of yellow spots on the surface of the leaves, not white. Since it is even more difficult to deal with it than with an ashtray, it is better to take preventive measures: seeds should not be sown very thickly, crop rotation should be followed, crops should not be watered with cold water, it is required to harvest on time.

If the appearance of downy mildew could not be avoided, measures must be taken to treat it. This will help drugs such as Kuprosat, Ridomil, Oxychrome. Folk recipes are effective against the false form of the virus, for example, spraying with whey in combination with blue vitriol (1 teaspoon per 3 liters of whey and 1 bucket of water).

How to warn

Experts advise growing such varieties of cucumbers that have a strong immunity to the disease. These are Ofix, Swallow, Phoenix, Darling, Octopus, Pasadeno, Pasamonte.

Sanitary cleaning of the territory (removal of plant residues and weeds from it), adherence to the rules of crop rotation (the return of pumpkin crops to their usual place no earlier than 3 years) are used as preventive measures. Preventive measures include isolating crops to keep the virus from spreading more than 20 meters away from similar crops. It is also required to regularly thin out plantings, remove old leaves from cucumbers that touch the surface of the earth. It is important not to make a lot of nitrogenous dressings, to feed crops with phosphorus-potassium fertilizers in a timely manner.

There is a type of disease prevention tested by many gardeners.

Even before the leaves bloom, namely in early spring, the bushes on the site are scalded with boiling water. Do this quickly, using a watering can with a diffuser.

Such an effect does not harm plants waking up after hibernation, but leads to the death of fungal infections. It is permissible to resort to the help of a household steam cleaner - a jet of steam, which is supplied under high pressure, has a similar effect.

Video "Methods of counteracting powdery mildew"

In this video, an experienced gardener will tell you what to do to prevent and treat one of the most common fungal diseases that affect gardens and orchards.

gryadki.com

First Aid for Cucumbers: Powdery Mildew

Cucumbers. Their curly two- and three-meter vines with large leaves, which are akin to maple, are strewn with more than a dozen cherished greens with pretty yellow flowers. With the exception of the latter, each puzzle of such a wonderful plot is presented in turquoise and salad colors. And it also happens that you have to "beat the bells." The reason for this is powdery mildew on cucumbers. Already something, but she knows how to bring dullness into the colorful days of a summer resident. In addition to it, there is also the so-called. downy mildew (peronosporosis), due to which the leaves of cucumbers are first covered with colorless pigments from the wrong side. Quickly corroding the layer of "tops", fungal spores come out already in the form of small brown blotches. It is good that the control measures for ordinary powdery mildew and downy mildew are the same.

Downy mildew on cucumbers

In general, pruning of cucumber leaves should be carried out with the incidence of mosaic, fusarium, etc. But after all, spores of harmful fungi, flying through the air, can easily cover the entire plant. Accordingly, in the fight against dew, it is better to focus on the growing conditions than to treat the symptoms themselves, which is precisely the disease.

Video "Downy mildew on cucumbers, control measures"

As mushrooms grow in the forest after a long downpour, so the spores of the harmful mycelium of powdery mildew cover vegetable, horticultural crops after regular spraying and even watering. The culprit was found out - excessive humidity.

And it's about high humidity air and earth at the same time: the soil evaporates moisture upwards, making the atmosphere "bath". Therefore, powdery mildew on cucumbers in a greenhouse is less common than on cucumbers growing in the open: in the unstable climate of Russia, the temperature of + 20-25 ° C sometimes alternates + 15-18 ° C, which contributes to the formation of "hoarfrost" on the upper and big leaves. The corresponding fluctuation often occurs in May and August, when the cucumbers are young or ripe. But the retention of moisture inside the soil provokes excessive evaporation, due to which the lower leaves of the cucumber “rust”, because. suffer from downy mildew.

To reduce the risk of the onset of diseases, growing young cucumbers through seedlings, as well as their prevention, make sense by default. In this case, much attention will have to be paid to watering. It must be carried out strictly according to the schedule, guided by the conditions of growth:

How to properly water cucumbers

Powdery mildew on cucumbers, how to water

The question is, how to get rid of powdery mildew, which is caused by excessive moisture, if cucumbers have to be watered quite often? It's simple - you need to use an integrated approach:

• Firstly, the irrigation regime implies not only the schedule, but also the water consumption. This indicator varies depending on the age of the cucumbers (the larger the bush, the greater the consumption), but in any case, the amount of water consumed should be such that by the time of the next watering, the land where the crop grows has time to dry out a little;
• Secondly, cucumbers do not tolerate cool and especially cold water. She stands idle in the ground for a long time and causes stress in the plant, due to which the leaves and greens are twisted;
• Thirdly, the prevention of powdery mildew necessarily implies the enrichment of the soil with phosphorus and potassium. The last element is rich in wood ash, which is why it is so often advised to pollinate the ground and cucumber leaves. Phosphorus releases superphosphate and complex fertilizers. But root fertilizing with nitrogen fertilizers like saltpeter or urea should be flatly abandoned, because. they increase the acidity of the soil, after which the latter becomes heavy, which worsens the ventilation of the root system;
• Fourth, downy mildew first covers the lower leaves, which indicates waterlogging of the earth. In order for the latter to evaporate less moisture, it is recommended to cover it with mulch in the form of straw, tree leaves or agrofibre. By the way, with a mulched layer, the soil stores more moisture, so the watering schedule can be reduced;
• Fifth, cucumbers should be provided with good lighting. Shade reduces air temperature and promotes humidity, so green vegetable beds must be cleared of weeds and thinned out. This is especially true for seedlings, which individual gardeners often plant densely;
• Sixth, a small but constant watering is better than a heavy one. Accordingly, it is advantageous to moisten the soil with a drip tape than with a watering can. The use of the latter is a tradition for many, and because of it, water often gets on the stems and leaves of the vegetable, which only contributes to powdery mildew on cucumbers.

On a note

The soil is of different types - sandy, loamy, peat, sod. Last - a good option for growing cucumbers, but in order to get it, you need to go to the landing-forest. Sandy loam soil does not store moisture well, loamy soil is viscous, peat soil is nutritious, but “sour”. Therefore, to prevent various diseases, including powdery mildew, cucumbers must be grown in mixed peat-turf substrates.

But how to fight for the future health of cucumbers if there is no way to prepare universal soil? It's simple: when choosing a site, it makes sense to at least be guided by vegetable crop, which grew a season earlier. The fact is that the land can be infected, therefore, for a cucumber, the best predecessors are legumes and root crops; acceptable - tomato, cabbage and bulbous; the worst are potatoes and cucurbits, especially the cucumber itself”

Powdery mildew resistant cucumber variety

Choose a variety of cucumbers resistant to powdery mildew

The fight against powdery mildew on cucumbers can be completely eliminated if resistant hybrids of cucumbers are used. They are bred by breeders by crossing several varieties in wet conditions. The label "F1" indicates hybridity. Among the relevant representatives, the most well-established are:

• Anyuta F1;
• Voyage F1;
• Dear F1;
• Pasadena F1;
• Octopus F1;
• Goosebump F1;
• Boy with a finger F1;
• Dear F1;
• Crane F1;
• Fontanel F1;
• Phoenix plus F1;
• Benefit F1;
• Sir F1;
• Princess F1;
• Ibn Sina F1;
• Julian F1 and others

Moreover, individual hybrids have complex resistance to common cucumber diseases - ascochitosis, mosaic, fusarium, tobacco mosaic. Adequate immunity is not a guaranteed panacea. Moreover, when choosing cucumber seeds, it is also necessary to pay attention to their ability to self-pollinate, early maturity, taste, suitability for preservation, etc.

We use drugs

Despite the abundance of methods and means to prevent "whiteness" and "rust", many vegetable growers, hoping for a chance, are faced with a thematic misfortune "on the forehead", and only then they take up the treatment of powdery mildew on cucumbers. Well, better late than never. The following table suggests considering the most effective drugs in the fight against powdery mildew.

Table "Preparations for powdery mildew"

Name Category Method of application, dosage Disadvantages Overall rating on a 10-point scale

"Baktofit"	Biofungicide	Spraying: 20 ml per 10 liters of water; Watering under the root: 20 ml per 10 liters of water	Washed away by precipitation	9+
"Fitosporin-M"	Biofungicide	Spraying: 6-10 g-ml per 10 liters of water	Doesn't handle light well	9
"Topaz"	Fungicide	Spraying: 3 ml per 10 liters of water	Prohibited during the fruiting period	8+
"Quadris"	Fungicide	Spraying: 6 ml per 10 liters of water		7
"Thiovit Jet"	Fungicide	Spraying: 30-50 g per 10 liters of water;	Prohibited in the heat and fruiting period	7
Hom (copper oxychloride)	Fungicide	Spraying: 40 g per 10 l of water	Washed off by precipitation, prohibited during the fruiting period	7+

In order to prevent downy mildew, control measures were minimized, it is better to spray cucumbers with biofungicides and fungicides in advance - 2-3 times during the entire growing season, i.e. every 2.5 weeks.

Although biofungicides can be used during fruiting, vegetables treated with them are allowed to be consumed 2-3 days after treatment. Also pleased with the presence of useful micro- and macroelements in the composition of biofungicides.

Folk remedies

In addition to industrial preparations, powdery mildew can be fought with folk remedies. They are less effective, but economical and natural, which makes them suitable for use even during the period of active formation of ovaries.

When stirring a teaspoon of soda and soap in 10 liters of water, a good antifungal solution is obtained, which must be sprayed on cucumbers once a week for 2-3 weeks.

To prepare this remedy, you must first boil “tea” from 100 grams for 2 hours. field grass and a liter of water. Next, one part of the solution should be diluted with 5 parts of water, after which the solution is ready for spraying. Processing is carried out 4 times every 3-4 days.

To the question “powdery mildew on cucumbers, what to do?” was resolved in a week, you can insist medium garlic in water at room temperature. The resulting tincture remains to be filtered so that it does not clog the spray bottle.

Video "Powdery mildew on cucumbers, what to do"

Prevention of infection of cucumbers with powdery mildew

Cucumber, although a moisture-loving vegetable, should not be overzealous with its watering. Otherwise, powdery mildew on a cucumber will not take long to eliminate, the measures to eliminate which are as follows:

• Selection of seeds of resistant hybrid "F1";
• Planting in well-lit and high-quality soil, where a foreign culture previously grew;
• Laying a mulch layer on top of the topsoil;
• Optimal Mode glaze;
• Top dressing with phosphorus-potassium fertilizers;
• Thinning and loosening beds;
• Preventive spraying.

It turns out that powdery mildew is easier to prevent than to treat. A comprehensive preventive approach seems complicated, but it is better to apply it in a timely manner than to lose 50-100% of the crop due to disorganization.

Video "Agronomist's word about cucumbers"

veselyi-yrozhainik.ru

Diseases of cucumbers lie in wait for summer residents at every turn. Do not relax, because the care of cucumbers is not limited to planting and growing them. In order for the cucumber harvest to be good, you will have to work hard, spending a lot of your time and physical effort on providing proper care, preventing possible diseases, and fighting diseases and pests.

powdery mildew

What are the signs of the disease

Powdery mildew is considered to be one of the most common diseases that affects different cultures including cucumbers. The disease "beats" the leaves of the plant. Stems and petioles are not so often susceptible to infection, very rarely - cucumber fruits. If a small White spot- This is powdery mildew.

The spot increases in size, first covering the entire leaf, and then the entire plant. Gradually, the disease negatively affects the entire plant. It can be seen how the common bush “suffers” when brown lashes fall from it. Powdery mildew slowly kills the plant. If it grows in an infected form, then this will lead to a decrease in the quality of the fruit, and much fewer cucumbers will grow. Why does the disease appear?

Causes of Powdery Mildew

• increased degree of humidity;
• planting cucumbers without proper care;
• the presence of weeds in the beds;
• systematic changes in temperature indicators;
• when poured with cold water;
• winds, drafts;
• if planting cucumbers every year is carried out in the same place.

The disease remains in the ground, on plantains, weeds and on infected plants that have remained overwintering in the garden.

The development of cucumber powdery mildew is also facilitated by sudden changes in temperature, high humidity and dew.

How to deal with powdery mildew on cucumbers

Over the years developed a large number of all sorts of ways to eliminate this disease.
It is necessary to plant only strong and resistant cucumber varieties, as well as its hybrids. If the owner of the site saw the first signs of the disease, the infected parts of the plant should be cut off and disinfected, or burned.

In the event that the disease progresses, the cucumber bush should be treated with ground sulfur (take 30 g per 10 sq.m. of planting).

You can make a sulfur solution colloidal: 30 grams of 0.3% sulfur per 1 bucket of water.

Action: spray plants with mullein.

In order for the next year the plant does not get sick, it is necessary, in without fail remove all plant debris. The beds must be dug deep.

When only signs of powdery mildew appeared on cucumbers, they increase the fertilization of the soil with potassium.
When the disease progresses, and the whole garden is already in danger, then poisonous chemicals are used. Suitable "Topaz", "Oxyhom". It is necessary to act strictly in accordance with the instructions developed by the manufacturer.

Symptoms of the appearance

On the reverse side of the sheet, a gray coating with a lilac tint is visible.
And on the front of the leaf appear light green spots with a yellowish tint, oily consistency. Their shape can be round or triangular.

After a while, the spots increase in size and pass to the surface of all leaves of cucumbers.
Infected leaves turn brown-burgundy. They will become brittle. The leaves, as a result, crumble, and the stems are exposed.

A disease such as downy mildew differs from a simple one in shade and in the nature of the spots that form. When it is a simple flouriness, the leaves seem to be sprinkled with flour. The white spots are small. If false mealy, cucumber leaves, as if burnt from dew drops sunbeams. Both the first disease and the second harm cucumbers. Without treatment, they will die.

Reasons for the spread of downy mildew

The occurrence of this disease may be due to the fact that a certain type of fungus living in the soil begins to actively multiply. They live in the soil for about 6 years.
Factors that have a beneficial effect on the growth of fungi:

• Too much air humidity;
• rainy season;
• fogs;
• Dew;
• Incorrectly chosen place for planting cucumbers (shady side);
• There is no natural air circulation.

False mealy on cucumbers develops well when the temperature very often drops and rises sharply. This can happen both during the day and at night. The air is completely saturated with water vapor with a difference of more than 10 degrees. Then, at 100% humidity, dew appears on the leaves. It is important, with the onset of night, to cover the cucumbers, or to provide them with heating.

Peronosporosis of cucumbers or downy mildew is one of the widespread diseases of this vegetable. This is just the disease that can lead to the death of the plant.

Ways to fight

In order for false mealy "not to occupy" cucumbers, it is necessary to carry out preventive measures. This is necessary to obtain a healthy and whole crop. Folk remedies to combat this disease are suitable in order to eliminate the first symptoms and extensive lesions when the ovary has already formed. Chemicals are used only until the fruit ripens.

Preventive measures to prevent this disease

It is much easier to prevent the onset of the disease than to waste time and energy trying to save cucumbers, or even lose the crop. To prevent this from happening, you should take the following measures:

1. Watering is carried out only in the morning. The water must be warm. This is necessary so that by the evening, the humidity level has decreased.
2. It is necessary to maintain the temperature at the same level, without sudden jumps. In the daytime, a suitable temperature is +25 degrees, at night - + 18- +21.
3. It is necessary to change the place of planting cucumbers every season.
4. The greenhouse must be ventilated as often as possible.

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One of the preventive measures to combat this fungus is the selection of those varieties that are resistant to false mealy. It is worth choosing cucumber hybrids that are resistant to it:

• Delpin F1;
• Vicenta F1;
• Anyuta F1.

If you give preference, nevertheless, to varietal plants, then after collecting the seeds they need to be soaked for disinfection in a solution of potassium permanganate (dark in color).

The use of special means

The use of biochemical preparations and chemicals is recommended even at the time when the seeds are being prepared for sowing. It’s easier than taking measures to destroy downy mildew later, and losing the crop. The following drugs have proven their effectiveness: Fitosporin-M, Adirin-B and Gamair;

For preventive purposes, so that downy mildew does not appear, it is necessary to make a fungicide solution. Then place cucumber seeds there for 1.5 - 2 hours. After that, the seeds are taken out, washed under water. Dry. They are ready to be sown in open ground, or for seedlings. 1 kg of seeds is consumed per one and a half liters of liquid.

In the period when the stem grows intensively, to prevent the appearance of downy mildew, it is advisable to spray the bushes effective drug, with a certain frequency. For example, one of these:

• Gamair. Every 14 days. 10 liters are spent per are.
• Vitaplan. After 21 days. 3 liters are consumed. on ar.
• Profit Gold. After 7 days (or 14). It consumes 5 liters per hundred square meters.
• Fitosporin-M. After 10-14 days. 10 liters are spent per are.
• Proton Extra. After 10 days. Consumption of 10 liters per hundred.

After preparations have been applied to prevent the appearance of false mealy on cucumbers, their condition may deteriorate sharply. To keep them in a viable state, it is worth conducting tests by selecting 2-3 bushes. In the event that they did not feel bad during the day, you can spray this drug over the entire area.

When cucumbers do not produce a crop every year, and the culprit is simple or downy mildew, then it makes sense to use chemicals both during the ovary period and when the plant bears fruit. Harvest, 7 days (at least) will not be able to be harvested, since cucumbers, after processing, will be unsuitable for food. But, all the remaining time, it will be possible to collect and eat delicious cucumbers.

Folk remedies for the treatment of downy mildew

For hundreds of years, people have come up with all sorts of ways to deal with downy mildew. This knowledge has been passed down from generation to generation. Here are some recipes:

• Garlic decoction. 75 grams of garlic, finely chopped, are placed in 1 bucket of water. Arrows can also be used. A decoction that has cooled is sprayed on the bushes.
• A solution of milk and iodine. Water - 9 liters, milk (0% fat) - 1 liter. Add 10 drops of iodine (alcohol solution 5% concentration). Spray cucumbers.
• Ash tea. Brewed in 3 liters of boiling water 0.5 liters. ash. Tea that has cooled down is brought to 10 liters of volume.

For spraying from this disease, any time of the day and any frequency is suitable. If the plant is sick, it should be sprinkled with decoctions more often. For achievement maximum effect the weather should be as windless as possible. Plants are also sprayed for the purpose of prevention. This procedure will not bring harm.

Signs of white rot on cucumbers

In areas that have been infected, a coating of lush white flakes appears. This is the mycelium of the fungus, which, over time, begins to increase in size. The tissues of the infected areas of the stem become soft, acquire a watery structure. The process of delivering water and the nutrients contained in it from the soil is disrupted. As a result, the plant withers and dies.

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Over time, the mycelium in some places becomes dense and dark. This suggests that the sclerocial stage of the fungus has begun. When cucumber fruits come into contact with an infected area of ​​the fungus, they become infected very quickly.

White rot of cucumber is found almost everywhere where cucumbers are grown. Especially often gardeners encounter it in closed ground.

How to deal with white rot

The key agrotechnical methods for combating cucumber white rot are the constant change of planting sites. It is also important to burn all remaining plant particles after harvesting. For 100% achievement of the effect, it is recommended to remove the various remaining parts of the plants simultaneously with top layer soil (2 or 3 cm). As soon as it became clear that the young stems began to rot, they must be removed immediately. It is also important to remove the layer of soil along with them.

For cucumbers in greenhouses!

It is also important to maintain optimal wet and thermal conditions in greenhouses. To prevent the humidity from being too high in greenhouses, regular ventilation will help to avoid this.

Cucumbers love evening watering and warm water.
If white rot has attacked cucumber tissues, chalk, ash, crushed coal are used for effective sprinkling. Many gardeners do this: they smear the infected areas with a certain composition. color pink. To prepare it, you need to mix potassium permanganate, chalk and water.

If it is seen that the areas are severely affected, they are cut out along with the healthy tissue that is nearby. Greenhouses and soil should be subjected, at intervals, to thorough disinfection.
The use of foliar dressings of cucumbers can do a good job. To complete them, you need:

Recipe for foliar top dressing from white rot

dilute 10 g of urea and 2 g of copper sulfate, 1 g of zinc sulfate in a 10 liter bucket of water.

Watering young cucumbers with a 0.1% Planriz solution will be very useful during the growing season. It does not hurt to use the Trichodermin tool, and also coat the cucumber stems with an aqueous solution from Rovral and Sumilex.

Symptoms of the disease

The fact that the plant is sick is evidenced by the brown color in which the root collar and roots of the cucumber are painted. The lower leaves begin to turn yellow, and all other leaves wither on summer days when there is a lot of sun. The flowers on infected plants begin to take on a painful appearance, and gradually begin to dry out. Zelentsy will not continue their development.

The disease by this time affects almost completely the entire root system. The roots take on a dark brown hue. Their structure becomes loose. The outer layer of stems dies.

Sick cucumbers quickly lose their healthy appearance and dry. There is another symptom that rot destroys cucumbers with great force. This is that the stem is loosened at the bottom. It is easily separated from diseased brown-burgundy roots.

If the soil has an acidity in the region of pH 5-6, most of the pathogens quickly develop their activity. They develop well at a temperature of + 5- + 45 degrees. Each type of virus prefers its own temperature for the manifestation of activity. The pythium virus loves temperatures from 12 to 24 degrees. Phytophthora virus needs a temperature regime of more than 7 degrees so that it shows maximum activity and forms harmful spores.

The level of soil moisture is a factor that affects the level of development of almost all diseases. When a summer resident often and intensively waters cucumbers, in greenhouse conditions, soil moisture rises greatly, and the amount of oxygen, needed by the roots for their normal life, decreases. This is the reason why the root system becomes weak and vulnerable when the plant is attacked by phytopathogens.

When sick" root rot» Cucumbers in greenhouses macerate the stalk

Ways to eliminate root rot

The fact that the leaves have become lethargic (as a result of the fact that the roots rot), the separation of the stem near the base, and the gradual death of the root system are symptoms of a serious disease. Often, the reason for the lack of resistance to this pathogen is that the plants were planted in the soil in violation of certain rules.

How to prevent these troubles:

1. Observe the principle of crop rotation (do not plant cucumbers in the same place for the next season).
2. When the process of planting cucumber seedlings is carried out, it is not buried to a strong depth. 1 cm depth is enough.
3. The height from the leaves of seedlings to the soil should be at least 3 cm.
4. Watering cucumbers is carried out only with warm water. The plant itself should be tried not to hurt.
5. When top dressing and mulching take place, one should not overdo it with the use of humus. The stem, in contact with the soil, needs oxygen, respectively, it is necessary to ensure its free access.
6. You should constantly monitor the level of soil moisture so that it does not exceed 85%. The soil temperature should be between +20 to +26 degrees.
7. Salinization of the soil should not be allowed, since this factor greatly weakens the roots of the plant.
8. It is advisable to choose fertilizers without chlorine. It is worth using organic fertilizers that have been composted for at least 6 months.
9. As soon as the summer resident noticed that the leaves of the cucumber began to wither, it means that the planting was not done in the right way. It is necessary to take a garden shovel, and carefully remove the earth from the stems of the cucumber. It is important not to touch the root, which is shallow.

Recipe for feeding cucumbers

The resulting cracks are treated with the following composition: half a liter of water, 1 tsp. copper sulfate, 3 tbsp. crushed wood ash. Another option: they pour ash into the places of stratification, finely crushed to a powder state Activated carbon or chalk (dry).

If, after carrying out all the procedures, the bush did not begin to recover, it should be dug up and burned. The place where the diseased plant grew must be treated by pouring a mixture of copper sulfate into the pit.

To prepare containers with a nutrient solution, humus, sod, and also peat soil in a ratio of 1:1:1. It is advisable to use composted mixtures sterilized biologically for at least 2 years. A good result is given by cassette technology with mineral wool plugs. It will avoid infection of plants through the soil.

It is worth considering laying the latest sterile mats. These methods prevent plants from being exposed to diseases. If the same soil is constantly used, this will lead to the fact that a variety of pathogenic organisms will accumulate in it.

If the root system rots in cucumbers, they can be saved if this method is also used. It will help when the cracks on the stems are small, and the lower leaves have just begun to fade.

Actions: with a sharp knife, cut off the lower, wilted leaves. Then they wait for the cut points to dry. Remove the plant from the support and put it on the ground. After this, the places where the leaves were cut off are covered with earth.

Last step: lift the plant and tie it to the support again. If such a procedure is carried out, young roots will appear on the part that was sprinkled with earth, and the plant will have a “second wind”.