Recognizing cucumber diseases according to description and photographs and choosing the right ones treatment methods and preventive measures, you can get a large harvest and harvest it until the fall. If a disease is detected at an early stage, it will be much easier to fight and will cause less harm. The article describes the signs of often striking cucumber diseases with photos and control methods with them.

Powdery mildew

Signs

The disease appears on the leaves in the form of small white spots. Powdery plaque gradually spreads over the entire surface of the leaf. The affected plant begins to turn yellow and wither.

These are symptoms of powdery mildew, a fungal disease of cucumbers, due to the spread of which the vegetable stops bearing fruit.

Causes

These are fungi that spend the winter on organic debris. Cloudy and cold weather contributes to their spread. When the temperature stays at an average of + 25 degrees all day, the disease does not manifest itself. This is the most common problem that appears on cucumbers when they are fertilized too often with nitrogen fertilizers and watered inconsistently or poorly.

Prevention measures

The first way to avoid powdery plaque on cucumbers is proper crop rotation. Plants should not be planted in the same place for several years in a row. Basic requirements to avoid infection:

• a cucumber can grow in the same place only once every 4 years;
• it is important to timely clear the beds of both fruits and plant residues;
• after harvesting crops grown in greenhouses, it is necessary to immediately carry out disinfection, for example, using a formaldehyde solution for this purpose;
• control the temperature, if necessary, cover the bushes so that the indicator remains at + 23_ +25 degrees;
• for irrigation you need to take only warm water;
• choose hybrid varieties that are resistant to powdery mildew for breeding.

Treatment options

In order to defeat powdery mildew, the plant is sprayed with fungicides, for example, topsin. This should be done as soon as the first signs of the disease are noticed:

The drug "Topaz".

• 2 ml of the drug
• for 10 liters of water.
• mix and process the plant. This must be done in calm, warm weather without strong wind. It can also be used for preventive purposes.

"Hom" (copper oxychloride). Use

• 40 g copper oxychloride powder;
• 10 liters of water.

For 10 square meters of planting, use a liter of this solution, which is sprayed on the plants.

Colloidal sulfur. It is taken based on

• 20 g colloidal sulfur;
• 10 liters of water.

If the treatment will be carried out on open ground, or 40 g for the same amount of water if a greenhouse will be treated. Plants are treated on both sides in cloudy weather.

If you don’t want to use chemicals, you can use traditional methods:

• Mix 1 kg mullein;
• 3 liters of water;
• stand for 3 days;
• then strain thoroughly;
• add another 3 liters of water;
• spray the plants.

Once every 7 days you can spray the plants with the mixture:

• 1 liter of sour milk;
• 10 liters of water;
• 50 g soda;
• 50 g the same amount of laundry soap.

Mix all ingredients and spray cucumbers once a week.

Downy mildew - downy mildew

Signs

This disease is also called downy mildew because the symptoms are quite similar. The spots that affect the plant with this disease are slightly yellowish in color.

The shoots become brown and dry out. The danger of the disease is that it can appear at any stage of plant development.

Why does the disease occur?

The main reason is watering at low temperatures, as well as the appearance of fungus at high humidity.

Prevention measures

Everything is simple here:

• crop rotation must be observed;
• plant plants at the correct distance;
• collect fruits on time;
• use warm water for irrigation.

Treatment options

When the disease has just begun to appear, it is worth stopping watering and fertilizing. For treatment, cucumbers are processed:

• warm solution of polycarbacin;
• copper oxychloride;
• Bordeaux liquid (mix 100 g of copper sulfate and freshly slaked lime with 10 liters of warm water.

There are good chemicals:

• "Ordan".
• "Ridomil".

The main requirement is to maintain a temperature of +25 degrees in the greenhouse after spraying. When growing in open ground, it is worth covering the bushes with film at night.

For prevention you can use:

• whey;
• kefir with iodine (1 drop per liter);
• sprinkle the beds with ash.

Watch the video! Diseases of cucumbers: downy mildew and spider mites

Cladosporiosis - brown olive spot

Signs

This disease has a second name that fully describes its manifestation - brown olive spot. Accordingly, green or olive-colored spots appear on the plant, which darken and increase in size on the 3rd day of damage. It's mushroom cucumber leaf disease, which is spreading very quickly.

Ideal conditions for spread are sudden changes in air temperature and excessive humidity. Often the disease occurs at the end of the growing season, when the nights become cool. In the rain or from watering, the infection spreads as much as possible throughout the plants and the ground.

Why does it occur

Fungal spores, which are the causative agents and carriers of this disease, overwinter on plant debris.

Prevention

Preventive methods that will help prevent cladosporiosis:

• observe the principles of crop rotation;
• water only with warm water, ventilate greenhouses;
• keep the garden beds clean and tidy.

Treatment options

• at the first manifestations of diseases, it is necessary to stop watering the plants for several days;
• It is definitely worth monitoring the air temperature in the greenhouse (not lower than 20 degrees);
• for treatment by spraying take:
  • Bordeaux mixture 1% solution,
  • copper oxychloride 0.4% solution,
  • "Fundazol".

You can also use Oxychom:

• 20 g "Oxychom"
• 10 liters of warm water.

Sclerotinia - white rot

Signs

White bodies appear on the affected areas, which subsequently darken.

Then the leaves, stems and even fruits become covered with a whitish coating, causing them to mucus, soften and rot.

Why does it occur

Sclerotia, fungi that overwinter in the soil, are the main cause of the disease, and they spread in conditions of high soil and air humidity.

Prevention

All methods that will help in the fight against other diseases are suitable for prevention:

• correct adherence to crop rotation;
• cleaning beds from plant debris;
• does not thicken cucumber crops.

Treatment options

Infected plant parts should be cut back to healthy tissue immediately to prevent the fungus from continuing to infect other cucumbers. The cut areas are carefully treated with lime or charcoal. If there is a large area of ​​damage, the entire plant should be removed.

You can feed the plant with a nutrient solution:

• 10 g urea;
• 1g zinc sulfate;
• 1g copper sulfate.
• 10 liters of water.

Gray rot

Signs

On the fruits, where the flower attaches to the stem, a gray coating appears, then becomes covered with fluff in the same place.

Why does it occur

The disease spreads due to excessive watering and low ambient temperatures.

Prevention

• Bushes should be planted only once every 4 years in one place;
• plant the bush at the correct distance from one another;
• proper care and use of preventive measures;
• After harvesting, treat the planting site.

Treatment options

1. Do not water cucumbers for 2-3 days;
2. ventilate the greenhouse;
3. destroy the affected areas;
4. in case of a large lesion, the entire plant is removed and burned;
5. thin out the plants, remove barren flowers and trim excess shoots so that the plant can fully develop;
6. Copper-chalk powder, ash or a mixture of ash and chalk, one glass at a time, should be applied to the cut areas, adding a teaspoon of copper sulfate.

Among the spraying preparations used:

• "Trichodermin";
• "Fitosporin";
• "Home";
• "Oskihom."

Dilute according to instructions.

Root rot

Signs

The roots become brown, dry out and die, then the root collar and stem dry out and become thinner, which is why the whole plant suffers.

Why does it occur

The disease appears due to:

• watering with cold water;
• due to dense plantings;
• sudden temperature changes;
• when the seeds were planted deep into the soil.

Important! The disease persists in the soil and plant debris.

Prevention

To prevent the roots from rotting, you should:

• observe crop rotation;
• use warm water for irrigation;
• make sure that the stems are not covered too high with soil;
• in the greenhouse, control the air temperature, insulate the bed at night with covering material when it gets cold.

Treatment options

When the roots are affected by rot, the following measures should be taken urgently:

1. It is necessary to remove as much soil as possible from the stems of the plant;
2. for treatment it is worth using a disinfectant solution (2 teaspoons of copper sulfate and 6 tablespoons of lime or ash per liter of water);
3. dust the root system and stem with ash or chalk and dry well;
4. After the roots have completely dried, cover them with soil;
5. Dig up the affected bushes and burn them.

Anthracose or copperhead

Signs

Many brown spots appear on the leaves and stems of the plant, the fruits are covered with wet ulcers, the leaves dry out - these are symptoms of anthracosis infection.

Why does it occur

• The cause of the disease may be contaminated seeds that were used for planting. The seeds may have been collected from an infected plant. Or the cucumbers were planted in a place where the fungus remained.
• Another reason could be that the plant is watered with water at too low a temperature or significant temperature changes.

Prevention

Measures that will help stop the spread of the disease are compliance with the principles of crop rotation and maintaining order in the beds.

Treatment options

To defeat anthracnose, you need to:

• before harvesting, spray the plants with 1% Bordeaux mixture once a week;
• treat diseased plants with a 0.5% solution of copper sulfate, and then sprinkle with lime or charcoal.

Fusarium wilt

cucumbers in greenhouses and greenhouses are most susceptible to fusarium wilt.

Signs

Individual leaves begin to wither, then shoots, and then the root collars rot.

Why does it occur

Humidity is the root cause of the development of this disease.

The causative agent of the disease is stored in the seeds and soil, which manifests itself when the plant begins to bear fruit. First, a few leaves wither, but it ends with the whole plant withering and dying.

Prevention measures

• It is necessary to treat the seeds before planting in the ground.
• The soil is also thoroughly treated with a solution of Fitosporin or Trichodermin.
• This must be done 7 days before the seeds or seedlings survive.
• A good preventative measure is to improve the health of the soil with high-quality compost.

Field mosaic

Signs

Aphids carry a disease called field mosaic. It is so named because the leaves turn yellow-green in a mosaic pattern.

After defeat, they curl up, dry out and fall off. The entire plant suffers; at the first drop in temperature, it stops developing and dies.

Prevention measures

The mosaic virus overwinters in weeds. Therefore, the best preventative measure is thorough weed removal.

Treatment options

White and green mottled mosaic

Signs

The disease manifests itself as white or slightly yellow spots on the leaf, which subsequently merge and become white; only the veins in the plant remain green. Due to the damage, the plant slows down, depressions appear on the fruits, and a large number of barren flowers appear. This type of mosaic can be transmitted through infected seeds, and can also be stored in soil and plant debris.

Causes

The provocateur for the manifestation of the disease is a rapid rise in temperature in greenhouses from +20°C to 30°C and above, especially with dense plantings.

Prevention measures

• proper care of cucumber bushes;
• Before planting, the seeds must be warmed and treated. proper planting of bushes;
• timely removal of infected shoots or plants, they must be burned;
• aphid control;
• use warm water for irrigation
• fight weeds.

Treatment options

• treatment with serum solution.

Why do cucumber leaves turn yellow?

There are several reasons:

1. The first of them is simple and independent of humans - the plant is cold. Very often, due to a sharp temperature change, cucumbers suffer. Simply warming the plants at night will help solve this problem. They can be covered with film or other covering material.
2. The second problem is a lack of potassium. There are several ways to deal with it:

Using an infusion of ash for spraying. To do this take:

• 3 tbsp. l ash;
• 1 liter of warm water and leave for 2 days.

Top dressing with infusion of onion peels. Mix in a metal container:

• 10 liters of water
• 50 grams of onion peel (2 tbsp.)

All this is boiled and after cooling, a slightly warm solution is watered over the plant under the bush. Use 1 liter of infusion per bush.

Watch the video! Causes of yellowing cucumber leaves

Diseases of cucumbers are unpredictable and dangerous primarily because they occur at the slightest violation of the growing conditions of the crop. Despite the fact that cucumber varieties that are resistant to some diseases have already been developed, most are still vulnerable to pests of all kinds. As you know, it is better to know the enemy by sight. Cucumber diseases and their treatment are the topic of this article.

The leader in the frequency of damage to cucumber leaves is powdery mildew. It appears as a powdery whitish coating over the entire area of ​​leaves and stems. If ignored, the disease spreads to the entire plant, leading to yellowing of the cucumber shoots and then their complete drying out. The disease is caused by fungal microflora. It often leads to the death of the plant.

The “harvest” season for powdery mildew occurs during cloudy, cool periods, at air temperatures no higher than 18-19°C. It survives the winter well, so it can survive on plants that have not been harvested from the garden in order to move to neighboring bushes in the new season.

Bushes with an excess of nitrogen are most susceptible to powdery mildew, especially if they are not watered regularly. Thus, by arranging for “drying” of the soil, the day before feeding the cucumbers with a large dose of fertilizers containing nitrogen, you expose the bushes to the risk of developing powdery mildew.

Disease prevention is about being proactive. Try not to plant cucumbers for two years in a row in the same place; move them around the garden so that they return to the previous planting site in no less than 3-4 years. At the end of the fruiting period, completely remove the plants from the beds. Treatment of greenhouses and open ground areas should occur immediately after harvesting cucumbers from the beds. The air temperature (especially in greenhouses) should not fall lower than plus 24-26°C, so as not to create a favorable environment for fungal growth. Use warm water for watering so that there is no sudden change in soil temperature. Regular treatment of plantings with fungicides will not leave powdery mildew a single chance.

At the first symptoms of the disease, plants should be treated with antifungal drugs, for example, Topsin-M or Topaz. Dissolve 2-3 milliliters of the selected preparation in 10 liters of warm water and begin spraying the bushes. The procedure is best carried out on windless, dry days.

To combat the dominance of powdery mildew, use well-proven copper oxychloride. For 10 liters of warm water, take 40 grams of copper oxychloride, and then start spraying.

During periods of flowering or fruiting, the use of chemicals is extremely undesirable, so you can use:

• mullein tincture (1 kilogram of raw material is soaked in 3 liters of water for 3 days, then diluted with another 3 liters of water before use);
• whey (1 liter of sour milk is mixed with 1 liter of water, filtered);
• soda-soap solution (mix 50 grams of soda with 50 grams of laundry soap, dilute in 10 liters of water).

Remember that before spraying you need to remove infected areas of the plant.

Downy mildew

The disease appears as light, slightly yellowish or white spots over the entire surface of the leaves. After some time, the affected areas begin to acquire a brownish tint, after which they dry out. The main danger of downy mildew is that it can appear at any stage of a crop’s life.

Downy mildew is a fungal disease that develops in high humidity conditions. This is facilitated by both excessive soil moisture and excessive thickening of plantings.

To prevent the appearance of downy mildew, you need to regularly thin out the density of cucumber shoots, tie them up and pinch them. Of course, you should not plant cucumbers in one place for two years in a row. At the end of the season, you need to completely remove the plants from the ground. Forget about watering with cold water. Excessive watering is, in principle, unacceptable. Also, regularly spray with fungicides or whey.

If a disease is detected, you should stop watering, avoid applying fertilizers, and pinching. As first aid, treat the plantings with a solution of polycarbicine, Bordeaux solution or copper oxychloride. You can use the drugs “Ordan”, “Ridomil”. During treatment, a stable temperature in the greenhouse is required, about 25°C. When growing cucumbers in open ground, hide them under film.

Brown spot

Cucumber diseases usually appear first on the leaves and stems of plants; brown spot is no exception. The disease is characterized by the appearance of green ulcers with a brown tint on plant stems. After some time, the spots increase, while the leaf itself darkens.

The problem is that brown spot affects the entire plant. The disease actively develops and spreads in cool weather conditions, when air humidity rises, for example, during periods of heavy rain. It is often caused by sudden changes in air temperature, for example, during unexpected night frosts. Spread is facilitated by rain, wind, and contaminated soil. Brown spot overwinters on plant debris and in soil. Fungal spores are frost-resistant.

To prevent cladosporiosis, transplant cucumbers to a new place every year; be sure to disinfect the soil before planting. Ventilate the greenhouse and also maintain a stable temperature in it; in the open area, cover the beds with film if frost is coming. At the end of fruiting, after harvesting, be sure to remove the above-ground and underground parts of the plants.

If you find brown spot on your plants, stop watering for at least 5 days. Try to stabilize the air temperature at 20-24°C to create unfavorable conditions for the life of fungal spores. Plants should be treated with fungicides, Bordeaux mixture, copper oxychloride or Oxyx. Be sure to remove bushes that are actively affected by the disease from the beds so that they do not spread it to their neighbors.

White rot

Fungal diseases are a real scourge of cucumbers. One of them, white rot, tends to appear over the entire area of ​​plants. Its symptoms: whitish spots appear, after a while they darken to black, the bush becomes covered with a thick whitish coating, becomes slimy, soft, and subsequently rots.

The root of the problem is the activity of the sclerotia fungus, which survives the winter well and develops very quickly and, what is most sad, spreads in moist soil with high air humidity.

As in the case of previous diseases, the invasion of white rot can be avoided by regularly thinning the planting density and replanting the cucumbers to a new location every year. It is very important not to over-moisten the soil, ventilate the greenhouse every day, thin out the leaves, and create access to fresh air in the beds. After harvesting, it is imperative to remove the plants from the soil and treat it with antiseptics and fungicides.

The disease must be treated by removing the infected parts, treating the cuts with ash or lime. In case of extensive damage, you will have to completely remove the bush from the garden, since without this you will not be able to cure the plantings. Treat the bushes with any fungicide, then apply therapeutic fertilizing with mineral fertilizers (dilute 10 grams of urea, 1 gram of zinc and 1 gram of copper sulfate in 10 liters of water).

Gray rot

Gray rot is characterized by brown spots powdered with a gray coating. It affects the entire plant, so you need to act decisively and without delay. As with all fungal diseases, gray rot actively multiplies in soil that is too wet, as well as when the air temperature drops.

For all fungal pests, prevention is the same: do not thicken the beds, remove plants from the ground at the end of the season, change the location of cucumbers every year. And, of course, the fight against them will not be complete without regular treatment of plants with fungicides or whey.

Fungal diseases of cucumbers and their treatment are largely identical. The affected bushes must be treated with a fungicide with active substances against gray rot; “Rovral” and “Bayleton” are suitable. Reduce or completely stop watering plants while treating with antifungal drugs. It is necessary to remove all infected bushes.

Root rot

Root rot is noticeable to the naked eye by the dryness of the leaves. The plant dries out; if you examine the roots, they are red and crumbling. Unlike previous diseases, root rot actively develops at high temperatures, insufficient soil moisture, or with excessive watering with low-temperature water.

The fight against root rot is carried out under the motto “down with thickening of plantings.” You can prevent the harmful activity of the disease: try not to water the bushes with very cold water, especially during hot periods, and also treat the plants with fungicides every 2-3 weeks.

In the case of root rot, it is necessary to stimulate the development of the root system of cucumbers. Add fresh fertile soil to the beds, cut off the lower leaves, and dig the stem itself into the fresh soil. Over the next 10 days, irrigate the soil around the plants with warm water. Use yeast solution. Dried bushes will have to be removed from the soil, treated with antiseptics (for example, iodine solution) and fungicides.

copperhead

A brown mosaic on cucumbers, due to which the plant begins to dry out and the fruits become covered with wet ulcers, is a sign of damage to the crop by verdigris. Often, copperhead progresses and develops on infected seeds that were not calcined or treated before planting. The fungus also overwinters quietly in the upper layers of the soil. The copperhead is activated by changes in air temperature or abundant watering with cold water.

Preventive pest control is carried out at several levels. First of all, replant cucumbers every year or take care to renew the soil. After harvesting completely, remove the plant from the ground. Do not use seeds taken from infected plants; be sure to treat them before planting. Pests take advantage of your carelessness; to deal with them, you must always be on alert.

For treatment, take a 1% Bordeaux solution, which you spray the bushes with every week. You should also remove infected segments of the bush, and cover the sections with copper sulfate or lime. Copper sulfate can be used to treat the soil after harvesting to kill the fungus.

To grow a rich harvest of cucumbers, you need to know not only the peculiarities of the agricultural technology of this plant, but also diseases that can cause irreparable harm to the plant and destroy the entire crop.

Common diseases of cucumbers

What diseases are most common? The fight against cucumber diseases involves first finding out the cause, eliminating it, and only then starting to treat the plants. To prevent the death of all plantings and preserve the future harvest, you should learn to identify the presence of the first signs of damage, learn how to deal with infectious processes and pest invasions. You can also plant cucumber varieties whose main advantage is resistance to infectious processes. Diseases such as:

• Anthracnose
• Ascochyta blight;
• White rot;
• Gray rot;
• Powdery mildew;
• False dew;
• Bacteriosis.

When the first signs of such diseases develop, it is recommended to process the cucumber bush in a timely manner to prevent crop loss in the future. Chemical fungicides are used for treatment, and folk remedies are also common.

Powdery mildew

The incubation period is 3-5 days. Distributed in damp, warm climates, all regions where the crop is grown are under threat. Outbreaks of harmful mildew on cucumbers are usually observed 3-4 days after rains. For the growth of condidia, the optimal temperature is 16-22 C and high humidity. Active spore formation occurs at low relative air humidity and plenty of light.

Methods for controlling powdery mildew in cucumber

Let's remember folk remedies for protecting cucumbers from powdery mildew:

• Whey (reverse) in a ratio of 1:10, processing per sheet to form a protective film, suppressing the spread of fungus.
• The soap solution acts in a similar way - it protects the surface of the leaf from the introduction of pathogens.
• A three-day infusion of mullein also has some fungicidal activity. Use 1 kg of manure: 10 liters of water.
• Nettle and tobacco are used for prevention - an infusion or decoction is used for spraying before the bush begins to be damaged.
• As soon as you notice the first signs of powdery mildew, immediately spray the plants with a fungicide such as topsin. Or treat them with a solution of the TOPAZ preparation, for the preparation of which mix 2 ml. preparation with 10 liters of warm water. Spraying is carried out in calm, dry weather both to prevent the disease and at the first signs of its appearance.
• Good results in the fight against powdery mildew are obtained by treating plants with the preparation “CHOM” (copper oxychloride solution). To prepare the solution, take 40 grams of powder and dilute it in 10 liters of water. Spray the plants, using a liter of the resulting solution per 10 square meters.

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Ascochyta blight

One of the most dangerous diseases of cucumbers, attacking both seedlings and adult plants. It also affects watermelon, melon and pumpkin. Moreover, plants in greenhouses and open ground are affected with equal success. Weak plants die quickly. Light gray spots form along the edges of the leaves, gradually spreading over the entire leaf area. Black spots appear on them - fungal bodies with spores. Small whitish-brown spots form on the stem, shoots and root collar. In case of secondary bacterial infection, gum (exudate) is released. The fruits turn black and mummify or become covered with a dense network of black dots.

It is most active during the fruiting period. The disease is infectious in nature. The fungus can remain in a state of suspended animation for a long time in the soil and on the stems. It is carried by organic debris, through the air and is sometimes found in infected seeds. Affected fruits are not edible. A plant affected by ascochyta blight in the last stage is difficult to cure and, as a rule, dies completely

Methods for combating ascochyta blight in cucumber

1. Avoid temperature fluctuations and watering with cold water.
2. Use seeds from trusted producers, processed accordingly.
3. Annual steaming and fumigation of the soil, disinfection of the greenhouse with a 2-5% formaldehyde solution (liquid consumption 1 liter per 1 sq.m).
4. Spraying with 1% Bordeaux mixture, copper sulfate (5 g per 10 l of water) with the addition of urea (10 g per 10 l of water).
5. To eliminate the disease on the stem, it is coated with copper-chalk powder (a 1:1 mixture of copper sulfate and chalk).

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Downy mildew - peronosporosis

Downy mildew, better known as downy mildew, is a common fungal disease of cucumbers that most often affects this crop and is dangerous for the crop. If measures are not taken, the plants may die completely. When the disease manifests itself, green oily spots appear on the leaves of cucumbers, which gradually cover a large area, leading to damage to the plant tissue. The leaves turn brown, like after a burn, and after 2-3 days they dry out completely. Optimal conditions for the development of these pathogenic organisms: sharp temperature changes in day and night temperatures, as well as rain and watering with cold water.

Although downy mildew does not affect the fruits, dried leaves, which are a source of nutrition, cause the vines to dry out completely. This leads to underdevelopment of fruits, reduction and loss of yield. Even if the fruits ripen, their taste and appearance leave much to be desired. Early-ripening cucumbers are more protected from damage by this disease, since the harvest takes place before the night temperatures drop.

Methods for controlling downy mildew of cucumber

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

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

In addition to traditional preparations, you can also use a folk remedy for downy mildew on cucumbers - whey. The leaves are sprayed with it.

Anthracnose

Anthracnose of cucumbers is one of the most dangerous diseases of such a vegetable crop, which has become widespread in many countries. Representing a fungal disease, copperhead (another name for anthracnose) infects the plant completely. On the stems it appears as brown spots, which, “eating away” the living tissue of the vegetable crop, simply lead to its breaking. The leaves are affected by yellowish spots that quickly increase in size; As a result, the tissue dries out and falls out, forming slit-like holes on the leaves. The next target of cucumber anthracnose is the fruit itself; on them, the disease manifests itself as small, fast-growing pink pads that quickly merge into one solid, continuous ulcer. The mushroom mycelium penetrates deep enough into the greens: 3-5 mm. Cucumbers lose their presentation and become unfit for consumption.

Anthracnose of cucumbers is a disease that becomes most active at high air humidity; dew and rain, as well as above-zero temperatures from 4 to 30 degrees are the most comfortable conditions for its spread. The incubation period lasts from 4 to 7 days. At a temperature of +20-25 degrees, the ripening period of the mushroom is reduced and is three days.

Methods for combating cucumber anthracnose

Before sowing, it is recommended to treat the seeds with TMTD fungicide at the rate of 4 grams of the drug per 1 kg. This operation can be performed 2-3 weeks before sowing. The effect of the dressing extends over the entire growing season and consists in slowing down and stopping the process of cell division and nuclei of pathogenic fungi located in the plant and soil. Before sowing, it is also recommended to soak the seeds in a solution of the Immunocytophyte biostimulator. Its action has a preventive meaning, forms in plants high resistance to various diseases (including fungal ones), stimulates the active growth of the crop and the passage of various biological processes in it.

Bacteriosis of cucumbers is a very common disease. It has a very negative effect on the growth of cucumbers. The cotyledons are primarily affected, and small ulcers appear on them. Spots appear on the leaves that have an angular shape and are brown in color. The disease develops very quickly with sudden changes in temperature. The main sources of this virus are seeds and various plant debris.

Methods for combating cucumber bacteriosis

Affected leaves and fruits must be plucked from the plant and destroyed. Large areas of the lesion are treated with a solution of Bordeaux mixture at a concentration of 1%.

Gray rot of cucumbers

Gray rot is a bacterial disease of cucumbers. The disease is widespread. Affects all plant organs. Vague slimy spots, covered with a gray coating of sporulation, appear at the branches of the stem, at the root collar, and on broken parts of the plant.

Due to the constant infection of neighboring plants by spores, there is a real threat of significant crop loss.

Methods for combating gray rot of cucumber

• compliance with crop rotation and agricultural technology;
• correct and timely disinfection of the greenhouse;
• treatment of plants for preventive purposes;
• When a disease appears, stop watering;
• constant pruning of affected parts;
• Dust the affected areas with the following mixture: 1 cup of chalk, 1 teaspoon of copper sulfate, 1 cup of wood ash.
• if the disease intensifies, the plants must be treated with approved fungicides. To do this, you can use “Hom”, “Barrier”, “Rovral” or “Bayleton”.

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White rot of cucumbers

The causative agent of white rot of cucumbers is a fungus that affects the roots, lower part of the stems, leaf petioles and fruits. A white flaky coating forms on the affected parts of the plant, on which black dots subsequently appear.

The areas of tissue on which the fungus develops become soft and slimy, the plant withers and then dies. Green plants become infected very quickly upon contact with a diseased area of ​​the stem. With severe development of the disease, the yield of cucumbers (greens) is sharply reduced.

The development of the disease is facilitated by low temperatures and high humidity, dense plantings, and untimely pruning of diseased and dying leaves.

Methods for combating white rot of cucumber

1) alternation of crops in greenhouses and on ridges;
2) wiping with a piece of cotton wool or gauze the areas of the stem with the initial signs of the disease appearing, followed by dusting with crushed coal or chalk; cutting out diseased tissue while capturing part of healthy tissue;
3) evening watering of plants with warm water;
4) the use of foliar fertilizers (1 g of zinc sulfate, 2 g of copper sulfate and 10 g of urea per 10 liters of water);
5) cleaning of all plant residues with the top 2-3 cm layer of soil;
6) reducing air humidity in the greenhouse by periodic ventilation in order to stop the development of the disease; 7) cultivation of varieties resistant to the disease (Urozhayny 86) and with average resistance

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Common diseases of cucumbers and their treatment

The article describes all cucumber diseases that can cause great harm to the crop. The article also presents fungicides to protect cucumbers from diseases and agrotechnical measures that will help reduce the level of pathogen reproduction. Each description of a cucumber disease has a photo to visually represent the disease.

Cucumber - a vegetable crop widely distributed throughout the world. The homeland is China. But this vegetable occupies huge cultivated areas not only in its historical homeland. In the CIS countries, up to 30% of the area is left for cucumber in vegetable crop rotations.

Average yield is 15 – 20 t/ha.

The most common diseases are fungal diseases. They develop under certain conditions of the growing environment. Losses from such diseases can reach up to 50% of the crop. This is explained by the nature of the pathogens, the peculiarity of the cucumber culture itself, as well as the failure to comply with all the conditions for its cultivation. Oh, you can read it here.

Fungal diseases of cucumbers

Cucumber diseases - Alternaria

Biological preparations to protect cucumbers from diseases

Trichodermin p.(a.v.: cultural liquid containing spores and mycelium of the antagonist fungus Trichoderma lignorum, as well as biologically active substances produced by the fungal culture during industrial cultivation).

Apply:

• against gray, white, root rot, fusarium, alternaria, wilts, bacteriosis, powdery mildew (80 ml per 10 liters of water).
• Pre-sowing seed treatment. Consumption rate: 20 ml of the drug / kg of seeds.
• Adding to the nutrient mixture during sowing. Consumption rate: 2 ml of the drug / pot.
• Treatment of the root system of seedlings by dipping it in mash prepared from soil and humus (in a ratio of 2:1), water and Trichodermin. Consumption rate: 5 ml of drug / plant.
• Application into holes when planting seedlings in a permanent place. Consumption rate: 5 ml of drug / plant.
• Watering plants. Consumption rate: 100 ml of the drug / 10 l of water.
• Spraying plants, starting from the phase of two true leaves, every 10 - 20 days, depending on the forecast for the intensity of disease development. Consumption rate: 100 - 300 ml of the drug / 10 l of water or 5 - 15 l / ha.

Planriz– biological preparation (a.v. Pseudomonas fluorescens strain AR-33)

Effective against helminthosporium rot, powdery mildew, leaf rust, blight, late blight of potatoes, gray and fruit rot on fruit and berry plants, blackleg, mucous and vascular bacteriosis of cabbage, has a biostimulating effect.

Seed treatment - 1% solution one day before sowing. Application into the hole when planting seedlings - at the rate of 0.5 ml of the drug per plant, the working volume of the solution as needed.

Treatment of plants during the growing season - 0.5% working solution, preventive treatments - every 14 days. Treatments are carried out with standard spraying equipment with a working pressure of no more than 5 atm.

Pentafag-S, k.zh.(active virions of five strains of bacterial viruses, as well as biologically active substances that are formed during the lysis of bacteria).

Used for vegetable and flower and ornamental crops for pre-sowing seed treatment (20 ml of the drug/kg of seeds). Watering vegetative plants (200 ml/l of water), spraying vegetative plants, starting from the phase of two true leaves, every 10-20 days, depending on the forecast for the intensity of disease development (100-400 ml of the drug/10 l of water or 5-20 l/ha.

Fungicides to protect cucumbers from diseases

MC, (a.v. mancozeb + mefenoxam, 640 + 40 g/kg)

It is used against Alternaria and late blight with a consumption rate of 2.5 l/ha, with a working fluid consumption of 300-500 l/ha.

Fungicide Ridomil Gold MC, v.d.g. apply 2-3 times per season, with an interval of 10-14 days only for the first treatments, but not later than the flowering phase of potato plants. Then use contact fungicides Bravo, c.s. and Shirlan, S.K. with an interval of 7–10 days.

Quadris, s.k. (azaxystrobin active ingredient, 250 g/l)

Used against peronosporosis and powdery mildew. The drug is used only in a system with other fungicides.

Spraying during the growing season with a 0.04–0.06% working solution: before flowering; after flowering with an interval of 14–16 days. Consumption - 800–1000 l/ha. The next year of growing season on this plantation requires a change of crop.

, v.p.(active copper sulfate, at a concentration of 960 g/kg + calcium hydroxide, at a concentration of 900 g/kg.)

Helps against Alternaria, late blight, perenospora, ascochyta, anthracnose, rot; Usually 1% and 3% concentrations are used;

Spraying during the growing season with a 1% working solution. Working fluid consumption - 6 l/100 sq. m

Topsin-M, sp.(d.v. methyl thiophanate, 700 g/kg)

A systemic drug with broad therapeutic and preventive action to combat powdery mildew, cercospora, moniliosis, coccomycosis, scab, anthracnose, fusarium.

Spraying during the growing season 1 - 2 times with a consumption of 10 - 15 g per 10 liters.

, k.e.(active penconazole, 100 g/l)