Diseases of cucumbers in the greenhouse, photo and treatment

2024 Author: Howard Calhoun | [email protected]. Last modified: 2023-12-17 10:16

When growing cucumbers in protected ground, a variety of diseases can develop. They are caused not only by long-term cultivation of crops in the same greenhouse, but also by improper disinfection, lack of fertilizers. To know how to treat cucumbers in a greenhouse for diseases, you must be able to determine the cause of the disease. To do this, you do not need to do any tests: it is enough to know the signs of the disease and what drugs to treat.

Aphid

Melon aphid parasitizes on the inside of leaves, on flowers, ovaries. It can cause wrinkling and twisting of fruits. Cucumbers are usually damaged by this pest in the second part of summer. The pest is developing rapidly.

At the beginning of this disease of cucumbers in the greenhouse, the leaves turn yellowish. In a few days, the aphid multiplies to such an extent that it can damage not onlyfoliage, but also flowers and fruits.

To get rid of aphids, it is necessary to timely weed weeds on the site, process trees, shrubs, destroy garden ants.

You can get rid of the disease of cucumbers in the greenhouse with the help of folk remedies or by treating the plants with special preparations for aphids.

Among folk remedies, red pepper tincture has proven itself well. For its preparation, thirty grams of capsicum, a glass of tobacco are taken. Everything is steamed with a bucket of boiling water and infused for a day. After the infusion is filtered, a spoonful of green soap and a glass of wood ash are added to it. The consumption of the drug is a liter per square meter. Spray pepper tincture every day for a week.

Some gardeners struggle with aphids with a solution of soap and ash. To prepare it, you need to dissolve two glasses of ash in a bucket of water and add a spoonful of soap. The composition is left for a day. Before use, the product is filtered. Spraying is carried out every day for ten days.

Chemical preparations help to get rid of the disease of cucumbers in the greenhouse faster. From aphids, you can use "Karbofos", "Fufanon", "Aktara", "Arrow" or other means available in the garden store. It is necessary to use any drugs according to the instructions attached to them.

Whitefly

Pests and diseases of cucumbers in a greenhouse can completely destroy the crop. One of the pests that feed on plant sap is the greenhouse whitefly. It is not always possible to findon the plant, but sticky white marks, blackening of the leaves and their drying speak of its presence.

Whitefly can get into the greenhouse not only from weeds growing next to it, but also from neighboring areas. The pest flies through the door, windows, sits on the plant and multiplies rapidly, destroying the vegetables.

It is difficult to fight the whitefly, it is easier to take preventive measures. For this purpose, the vents are covered with gauze folded in several layers. In the greenhouse itself, pieces of plywood are hung, painted yellow and smeared with rosin with honey or petroleum jelly. Such traps attract whiteflies: insects fly to the bait, stick to the board and die.

Be sure to loosen the ground to a depth of at least three centimeters, add humus or peat.

Powdery mildew

The diseases of cucumbers in the greenhouse shown in the photo may not always be true. Powdery mildew is an ailment that can be of two types: true and false. Both are diseases, but each has its own characteristics and different treatments.

Downy mildew infects the plant at different stages of growth. It occurs both in open ground and in a greenhouse. Moreover, the infection persists in one place for up to six years.

Signs of illness are the presence of oily spots of green tint. Over the course of two weeks, they increase in size, turning brown, as if the plant had been burned. Then the sheet dries quickly, in just a couple of days. They say about this phenomenon that “a sourrain . In fact, the disease occurs when there are sharp changes in day and night temperatures, for example, +25 during the day, and +10 at night. Downy mildew can occur when watering with cold water.

Cucumber diseases in the greenhouse and their treatment affect the quantity and quality of the crop. To cope with powdery mildew, it is necessary to stop watering for a week, ventilate the greenhouse. As soon as the humidity level decreases, the plants are treated with special preparations, such as Topaz, Oxychoma. Dilute the funds according to the instructions.

During the treatment of the greenhouse, it is important to spray not only the plants themselves, but also the greenhouse, the soil under the cucumbers. After processing, the greenhouse is ventilated.

Real or true powdery mildew is manifested by the formation of white bloom on the leaves. The disease spreads quickly, the sheets look like they've been sprinkled with flour. Then the plants dry up.

The disease occurs due to watering with cold water, with a sharp temperature drop. Weeds, insects that have visited a diseased flower and flown into the greenhouse can infect cucumbers.

At the first signs of cucumber disease in the greenhouse, their treatment and prevention of powdery mildew is carried out by the following means:

1. Mullein solution. For him, you need to take a bucket of warm water and a liter of liquid mullein.
2. A tablespoon of urea.
3. Everything is thoroughly mixed. Plants are treated with a solution in warm weather. The leaves are sprayed from below and above.

Sulfur can be used to pollinate plants. To do this, take sulfur and place it in a bag. ATin warm weather, sulfur is scattered over plants.

There are special preparations for powdery mildew, for example, Topaz, Zaslon and others.

Brown olive spot or Cladosporiosis

You can see on the Internet a lot of photos of diseases of cucumbers in a greenhouse, in which the stems and fruits are covered with rounded olive-colored sores. They literally turn brown before our eyes, grow. Indentations appear on the leaves, which dry out, destroying the leaf blade. This ailment is cladosporiosis, a fungal infection.

The disease occurs in cool weather with sudden changes in temperature. During hot summers, olive blotch may occur late in the growing season. The infection spreads with rain, wind, water. The fungus remains on the plant and in the soil for a long time.

To prevent the disease from occurring, it is necessary to observe crop rotation and not return cucumbers to their original place for four years. It is also important to ventilate the greenhouse, remove all plant debris from the garden in time, and do not water the plants with cold water.

At the first sign of cladosporiosis, stop watering for five days. If the average daily temperature drops below eighteen degrees, you need to raise it to at least twenty degrees.

Be sure to treat plants with one percent Bordeaux liquid, copper oxychloride, Oskihom.

White rot or sclerotinia

The fight against diseases of cucumbers in the greenhouse comes down not only to airing and monitoring the temperature, but also to timelyplant processing. It helps to get rid of a variety of viral, fungal infections. One of the most dangerous ailments is white rot. With this disease, the fruits, stems, leaves are covered with a continuous white coating. The disease can be confused with powdery mildew, but its difference is that the fruits are involved in the process - they turn white.

Sclerotinia manifests itself due to fungi that overwinter in the soil and rapidly spread along the ground in humid air.

Proper treatment for cucumber disease in the greenhouse and preventive measures will help save the crop. To get rid of white rot, it is necessary to remove all diseased parts of the plant by sprinkling them with charcoal or lime. If the fungus has spread strongly, then you need to remove the entire plant.

Then the bushes are fed with a nutrient solution, taking ten grams of urea, one gram of copper sulfate and sulfur sulfate. All this is diluted in a bucket of water. Cucumbers are watered with a solution.

Grey Rot

With gray rot, stems, leaves and flowers are covered with brown vague watery spots. They quickly merge with each other, becoming covered with a grayish coating. This disease is bacterial, capable of infecting all parts of the plant.

The main cause of cucumber disease is waterlogging and low temperatures. This type of disease is preventable. To do this, do not thicken the plantings, as well as follow the rules of crop rotation. From the greenhouses where cucumbers were grown, it is necessary to remove all the remains of plants, as well as to process the greenhouse itself and process the plants in timepreventive purposes.

If suddenly the disease manifests itself, it is necessary to treat the plants with a fungicide. It can be Rovral, Bayleton, Hom. All affected parts of the plant are removed.

Root rot

Diseases and pests of cucumbers in greenhouses can persist for many years in the ground. Bacteria, viruses, pest larvae, fungi overwinter well in the soil, and when favorable conditions are created, they become active, destroying plants.

With root rot, the leaves begin to wither, gradually they dry. If you pull out a bush and look at its roots, you can see that they are painted red and look rotten. These signs speak of root rot - the most dangerous and common disease.

As soon as the disease is detected, the first thing to do is to stimulate the formation of new roots. To do this, around the bush, it is necessary to raise the soil level by at least five centimeters. This option will allow cucumbers to start new roots. You can cut the leaves from the bottom and lay the whip in a ring. In a week, the bush will re-root. During this procedure, the bush is not watered under the root, but only with warm water.

If the plant has already died, then it is removed from the greenhouse with soil. Fill the hole with fresh soil. All tool process.

Anthracnose

Timely treatment of cucumbers from diseases in a greenhouse can save bushes from copperhead or anthracnose. This disease manifests itself on leaves, stems with brown spots. Leaf blades begin to dry out, fruitscovered with wet sores.

The cause of the disease is often infected seeds collected from diseased plants. A fungus that persists in the upper layer of soil, in plant debris, can also lead to disease. When watering with cold water, sudden changes in temperature contribute to the rapid spread of the disease throughout the greenhouse.

To prevent the disease from occurring, it is necessary to observe crop rotation, as well as to remove the remains of plants from the garden in time, to till the soil.

If suddenly the plant gets sick, it is necessary to treat with Bordeaux mixture (1%). All affected parts of the plant are removed, sprinkled with lime.

Lack and excess of nitrogen

To get a good harvest, it is important not only to know and see the manifestation of the disease. Having studied cucumber diseases in the photo, treatment in the greenhouse will help protect the crop from death.

One of the most common plant problems is yellowing leaves. Each type of trace element has its own signs of yellowing. If the shade of the top sheet changes, then this indicates a lack of nitrogen. Such plants form small fruits in small quantities. Plants develop poorly.

When oversaturated with nitrogen, the leaves become dark green. Old and medium leaves bend, merge into a single whole, a brownish tint appears. The fruits become smaller, nitrates accumulate in them. Huge doses of nitrogen can kill a plant in a matter of days.

It's easy to solve the nitrogen deficiency problem. For this, the bushes are watered with mullein infusion.or use a solution of s altpeter (a tablespoon per bucket of water).

If there is an excess of nitrogen, it must be washed out of the soil. For this, abundant watering is carried out every day, and before sunset, foliar feeding is carried out with two percent calcium nitrate.

Calcium

Cucumbers need calcium to grow properly. With its excess, the bush becomes brittle, hard. With a deficiency, light stripes appear on the leaves. Over time, they expand, causing the leaves to wilt and die. On the inflorescences rot is observed. It extends to fruits, stems, roots.

To cope with the problem, you need to feed with calcium.

Phosphorus

With a lack of phosphorus, yellowness occurs on the leaves, necrotic spots form, and then, the leaves fall off. The plant begins to age rapidly, potassium absorption is disturbed.

With a deficiency, the plant stops growing, ovaries and flowers fall off. To solve this problem, it is necessary to water the plants with phosphorus-potassium fertilizer. It is bred according to the instructions.

Iron

You can see iron deficiency on young leaves. It is manifested by lightening the top of the cucumber. On leaf blades, the veins become whitish, growth and flowering slow down. To eliminate this cause of plant death, it is necessary to apply a solution of complex fertilizer under the root. It can be biohumus or mullein infusion.

Manganese

Manganese is needed for the synthesis of chlorophyll by plants. It takes part in a number of oxidative processes,originating in cucumber.

With an excess of manganese, the soil begins to turn sour. This leads to a decrease in the concentration of chlorophyll, chlorosis begins between the veins on old leaves, then on new ones. Leaf blades are covered with brown necrotic spots.

With a lack of manganese on the sheet, light dotted spots are formed on the upper part. To solve the problem of manganese deficiency, fertilizing should be carried out either with a manganese solution (0.3 mg per liter of water), or with a complex fertilizer solution, for example, biohumus.

There are other types of micronutrient deficiencies, manifested by a change in leaf color, a change in the shape and size of the fruit, falling inflorescences and other manifestations. To avoid them, it is important to fertilize plants with complex fertilizers once every two weeks.

To reduce the likelihood of disease, disease-resistant cucumber varieties should be planted in greenhouses. Such plants get sick less often, give a high yield.

Disease-resistant cucumbers in greenhouses rarely suffer from rot, powdery mildew and other ailments. To get a good harvest from them, it is necessary to carry out timely top dressing and monitor the microclimate in the greenhouse.