Diseases of cucumbers in a greenhouse and their treatment: how to process after planting with a photo

During the cultivation of cucumbers, many vegetable growers face a considerable number of problems, as these plants often suffer from various diseases. At the same time, viral diseases of cucumbers can appear even if they are grown in a greenhouse.

Quite often this happens due to the use of small greenhouses or violations of the rules of cultivation. To restore the he alth of the bushes, it is necessary to study the diseases of cucumbers in the greenhouse and their treatment in advance.

Causes of diseases

Cucumber diseases in the greenhouse may occur due to certain predisposing factors or conditions. There are several reasons why bushes start to hurt:

1. Air humidity level. During the cultivation of crops, it is necessary to carefully monitor the humidity of the air. If it is too high, ideal conditions will be created for the development of greenhouse cucumber disease. Due to too humid air, the fruits, stems and root systems of plants can suffer.
2. Failure to comply with agricultural requirements during cultivation.
3. Wrong crop rotation. Often inexperienced gardeners plant cucumbers in the same place for several years. Also, crop rotation violations include planting bushes in areas where plants that were incompatible with cucumbers previously grew.
4. Bad lighting. Sometimes greenhouses are installed in places with insufficient sunlight. For cultivation, it is recommended to choose areas that are well lit by the sun.
5. Lack of useful trace elements and complete depletion of the soil. In order for the soil to always contain a sufficient amount of nutrients, it is necessary to periodically feed it.Such top dressing consists of vitamin, mineral and other useful elements that young bushes need.
6. Wrong watering. Water the bushes very carefully so that water does not fall on the leaves.
7. Late detection of diseased seedlings. It is recommended to regularly inspect the bushes to check if they have diseases and pests of cucumbers. If the disease is not detected in time at the initial stage of development, then it will eventually move to the rest of the bushes.
8. Incorrect ventilation. The greenhouse must be ventilated periodically. However, this must be done carefully so that there is no strong draft.
9. Polluted greenhouse. The greenhouse should be periodically cleaned of fallen leaves of cucumbers, as various diseases develop in them.

Powdery mildew

One of the most common diseases affecting cucumbers is powdery mildew.

Signs

When this disease occurs, spots appear on the leaves of cucumbers in the greenhouse. Over time, they can spread to the stems. The spots are colored grayish or white and therefore outwardly they resemble scattered flour.

If you do not get rid of powdery mildew in a timely manner, the spots will spread throughout the plant. This will lead to the cessation of the appearance of fruits, the drying of the leaves and the death of the plant.

Reasons

The main reason why this disease appears is the wrong temperature regime. The disease appears at low temperatures during cool and cloudy weather. If the air temperature is raised to 25-30 degrees, then the spores will be destroyed. Also, the disease can appear if fertilizers that contain a lot of nitrogen are often applied to the soil.

Prevention

In order not to waste time on treating cucumber leaf disease in the future, it is necessary to figure out how to protect cucumbers from it. For prevention it is necessary:

• water bushes with warm water several times a week;
• monitor the beds with cucumbers - periodically weed them, remove weeds and crumbled dry leaves;
• cover the bushes with foil or close the greenhouse to raise the temperature in it;
• only grow varieties that are resistant to powdery mildew.

Treatment

Some people don't know how to deal with this disease. Powdery mildew can also be cured with folk remedies. To do this, spray the bushes with a solution of mullein. To make a solution of one kilogram of the substance, 3-5 liters of water are poured and infused for 5 days. Then the infusion is passed through gauze and again filled with 5 liters of clean water.

If there is no mullein, you can use sour milk. To do this, it is mixed with boiled water in a ratio of one to one. Spray cucumbers with this solution no more than once a week.

You can also get rid of powdery mildew with a soda solution. During its preparation, 100 g of the substance is mixed with 100 g of laundry soap and a liter of water. Use the prepared remedy every week.

Peronosporosis

The disease can appear on bushes of any age. This affects not only plants growing in greenhouses, but also in open ground.

Signs

Signs of the disease appear almost immediately after its appearance. Spots appear on cucumbers in the greenhouse, their leaves turn light yellow. After a few days, they begin to change their color and acquire a brown tint. It is imperative to treat the disease, since its further development will lead to the drying of all leaves and the death of the cucumber bush.

Reasons

Peronosporosis appears due to fungi that are often found in greenhouses. They develop due to too humid air. Also, the fungus can appear if you often water the bushes with cold water.

Prevention

To protect cucumbers in the greenhouse from diseases and downy mildew, you must follow certain rules:

• do not water the young bushes of the plant with very cold water;
• do not thicken plantings and plant seedlings less often;
• timely harvesting of fruits;
• disinfect seeds before planting them in the ground;
• remove plant remains from the site, as spores of cucumber diseases can develop in them.

Treatment

For the treatment of peronosporosis, folk remedies for diseases of cucumbers are used. An effective tool that will help get rid of peronosporosis is whey. You need to process the bushes with liquid several times a week.

Fungal diseases do not tolerate copper well, so you can get rid of peronosporosis with the help of Bordeaux liquid.To prepare it yourself, you should mix 100 grams of lime and copper sulfate with soapy water. Bordeaux liquid is recommended to be used once a week until the plants are fully healed.

Cladosporiasis

Brown spot is quite common in adult bushes and affects their leaves and fruits.

Signs

Kladosporiosis is a rather dangerous disease that can spread to all bushes within one week. The first signs of the disease begin to appear on the stems and leaves. They are covered with brown spots, which eventually pass to the fruit. Grown cucumbers affected by the disease should not be eaten and should be collected and discarded immediately.

To learn more about the signs of the disease, you can look at the photo of leaves that are affected by cladosporiosis.

Reasons

The disease occurs and actively develops with serious temperature changes. Also, cladosporiosis can appear after watering the bushes with ice water. The disease begins to appear at the end of the growing season, when nighttime temperatures are much lower than daytime temperatures.

Another common cause of brown spot is leftover vegetables. Over time, they accumulate a huge amount of spores of the fungus, which are very dangerous for cucumbers.

Prevention

Many people do not know what to do to protect the bushes from infection with cladosporiosis. To prevent the disease, you must:

• plant cucumber seedlings in well-lit greenhouses;
• water the bushes only with warm and infused water;
• regularly clean the beds from accumulated plant debris;
• water the cucumbers under the root so that the liquid does not get on their leaves;
• ventilate the greenhouse several times a week.

Treatment

When identifying the first signs of cladosporiosis, it is necessary to stop watering the plants. If the temperature in the greenhouse is below 20 degrees Celsius, then it must be increased immediately. The fight against diseases of cucumbers and cladosporiosis consists in treating the bushes of the plant with Bordeaux liquid or preparations that contain copper. Ash and lime can also be used with them.

The bushes should be treated with special sprayers, not a regular watering can.

Fusarium wilt

Not all varieties of cucumbers are resistant to Fusarium, so many vegetable growers often encounter this disease.

Signs

A plant can become infected with Fusarium at an early stage of its development, but the first signs will begin to appear only during fruit ripening or flowering.First, the leaves located at the bottom of the bush will gradually begin to fade. Over time, wilting will spread to the upper leaves, which immediately turn yellow and change their shape.

Fusariosis is confused with verticillosis, as these diseases have similar symptoms. To distinguish them, it is necessary to cut off one bush and carefully examine the vessels of the stem. If the cucumbers are ill with Fusarium, then they will be painted in a dark brown color. With verticillosis, the vessels are much lighter.

Reasons

To infect cucumbers with Fusarium, a special pathogen is needed. Fungi may be present on the surface of the inventory or in the ground. They are also often present in the seedling substrate and harvested seeds. There are several factors that cause Fusarium wilt to appear:

• not enough light in the greenhouse;
• seedlings planted too close together;
• the soil contains a large amount of fertilizer containing nitrogen or chlorine;
• greenhouse installed near industrial production.

Prevention

To prevent fusarium, you need to soak the seeds of cucumbers before planting. This is done with a strong solution of potassium permanganate, heated to 70 degrees. Before planting, the seed is placed in this solution for 2-4 hours for disinfection.

Treatment

Before you spray the bushes, you should figure out how to do it. Processing cucumbers and their treatment should be carried out by special means. The disease can be treated with biological drugs. Trichodermin is an effective remedy against Fusarium.

It can be added to seedling substrate. For each bush of seedlings, about 2 g of the drug is consumed. It can also be added to the soil with the calculation of 1 kg per square meter of land.

In addition, you can get rid of this disease of cucumber seedlings with the help of Pseudobacterin-2. To prepare a mixture, 100 ml of the drug is mixed with a liter of water.

Grey Rot

The disease is spread by contact and airborne during harvesting or when caring for bushes.

Signs

Gray rot is manifested by the spread of brown spots on the leaves of cucumbers. At high humidity, mold appears on cucumbers with fluffy gray spores, which are carried to other bushes by drafts.

Reasons

The disease appears and begins to develop actively only under certain conditions. The most suitable environment for the appearance of gray rot is low temperature and waterlogging. Therefore, it is recommended to regularly monitor the humidity and temperature in the greenhouse.

Prevention

To prevent the appearance of gray rot and protect cucumbers from diseases, it is necessary:

• properly care for the bushes and regularly spray them with special protective preparations;
• plant cucumbers at least 80 cm apart;
• be sure to spray the beds and greenhouse after harvest;
• observe crop rotation.

Treatment

When the first symptoms of gray rot appear, it is recommended to stop watering the plants for 2-5 days. You should also ventilate the greenhouse and get rid of all the affected leaves. To process cucumber bushes, you can use ash or copper-chalk powder.

Root rot

Cucumbers at any stage of their development can become infected with this disease.

Signs

First, the disease spreads to the root system of cucumbers. The roots turn brown and begin to dry out. If you do not take timely treatment, they will begin to die. Then the disease affects the root collar and stem. They also begin to change color and fade.

Reasons

Root rot appears with strong temperature changes. Also, this disease of cucumbers can appear due to regular watering of bushes with cold water or too deep planting of seedlings in the ground. It is recommended to immediately dispose of the remains of plants that have been infected with root rot, as they also spread the disease.

Prevention

Protection of greenhouse cucumbers from diseases and pests is as follows:

• water cucumber seedlings with heated water;
• adjust the greenhouse temperature periodically to avoid major fluctuations;
• do not plant cucumbers in areas where there has been root rot.

Treatment

If signs of root rot have been identified, you must:

• remove soil from bushes;
• fertilize the roots of the plant with manure and special disinfectants (you can prepare a solution of 5 tablespoons of ash mixed with a liter of water and a teaspoon of copper sulfate);
• sprinkle bush stems with chalk or ash;
• dig up infected seedlings and burn.

Anthracnose

A fairly common disease that occurs when growing cucumbers in greenhouses.

Signs

During anthracnose, brown spots appear on the plant. Within a few days, the leaves will begin to turn yellow, and wet sores will appear on the cucumbers. Therefore, it is not so difficult to recognize this disease.

Reasons

Most often, the plant becomes infected with copperhead due to diseased seeds that were previously collected from the bushes. Also, the disease can appear due to a fungus located in plant debris or the top layer of soil. In addition, anthracnose can spread quickly due to temperature changes and frequent watering with ice water.

Prevention

To prevent the disease, you must not forget about the correct crop rotation, so you need to plant cucumbers in their original place only after 3-4 years. You should also periodically clean the greenhouse from plant residues that accumulate during the cultivation of cucumbers.

Treatment

Before processing cucumbers, you need to figure out what to use for this. To get rid of anthracnose, you need to spray them weekly with a weak Bordeaux mixture. Instead, you can use a 0.5% solution of copper sulfate or a mixture of coal and lime.Treatment of cucumbers from diseases should be carried out in the evening after watering.

Conclusion

There are quite a few different diseases of cucumbers. To prevent their occurrence, you need to familiarize yourself with how to prevent diseases of cucumbers in a greenhouse.

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