Diseases of cucumbers in a greenhouse: causes and methods of treatment
There are a wide variety of diseases in cucumbers in the greenhouse, and their treatment requires the use of special tools and the implementation of the correct actions. What causes the diseases, what threat they pose to the plant, how to save the vegetable crop, it is urgent to find out.
Common diseases
One of the most common ailments of greenhouse cucumbers is the melon aphid. Signs of the presence of a pest are negative changes on the shoots, flowers, the inside of the leaves, the ovary. The cucumber becomes shriveled, curled up. Melon aphids develop quickly. Damage is common in August. From the very beginning, cucumbers acquire a yellow color, then it turns dark green. Within 2 days, the appearance of the flower and leaf changes.How to fight? It is necessary to weed the soil, destroy the weeds, since the melon aphid passes from the weed. To eliminate the disease of cucumbers, the plant is sprayed with a solution made using red pepper. Special care when growing cucumbers in a greenhouse and their treatment is carried out when they appear. Damage is associated with the suction of juice from the leaves. A white discharge of a sugary structure is observed.
Sooty fungi form on the leaves, which causes the leaves to turn black and dry.
- Growing cucumbers in greenhouse conditions requires careful removal of weeds throughout the area.
- Special measures are the installation of glue traps, for this door and window openings are covered with one layer of gauze.
- To attract a dangerous insect, plywood rectangles are used, which are painted with white and yellow paint. Plywood is lubricated with rosin, honey, castor oil or petroleum jelly are added to the composition.
- You can escape the greenhouse whitefly by spraying water on the plant. Efficiency is observed after washing the lower parts of the leaves on which the insect is located.
- When the washing manipulations are completed, the soil is loosened. A composition of peat and sawdust should be poured into it, or organic fertilizer should be applied.
Powdery mildew damage
Often diseases of cucumbers in a greenhouse are associated with powdery mildew. Experts also distinguish the so-called false dew. The latter option is quite common at the present stage. Downy mildew gives rise to various diseases of cucumber seedlings, since it is a kind of infection that can be present in the greenhouse for several years. The infected crop has spoiled leaves with characteristic oily base spots. They increase over time and degenerate into burn formations. By examining the images of cucumbers in pictures, a person can understand what external signs indicate problems.
Protecting cucumbers from this type of disease involves taking various measures. It is necessary to stop watering the culture with cold water. In addition, professional vegetable growers recommend giving up feeding for a week. Only in this way can the cultivation of cucumbers be resumed. Various drugs can also be used, for example, "Topaz". They are sprayed with bushes in accordance with the instructions.
The defeat of cucumbers in the open field is also often observed. For powdery mildew, rapid spread is inherent, and the culture may die after a short period of time.
To save the plants, you need to use a special solution that treats the bushes. To prepare it, you need the following components:
- water (10 l);
- mullein in liquid form (1 l);
- urea (1 tbsp. l.).
All elements are mixed and allowed to brew for 10 minutes. Spraying is necessary only in warm and not rainy weather. Otherwise, the solution will wash off and will not be able to act on the causative agent of the disease. The cultivation of cucumbers after the procedure is carried out in a standard way.
Great harm
Diseases in open field and greenhouse cucumbers include gray mold damage. It can be seen as characteristic gray patches with a structure that resembles mucus. Gray mold spreads well at low temperatures, especially at night. Watering with very cold water, as well as too dense planting of plants, can provoke the disease.
The fight against diseases of cucumbers consists of the following actions:
- It is necessary to plant a culture at a certain distance, if necessary, it will need to be thinned out.
- If a lot of empty flowers are seen on the bushes, it is recommended to pick them.
- Places where barren flowers were previously located are treated with ash.
Many diseases of cucumbers and their treatment require special attention. These include black mold, which is often observed on the leaves of greenhouse plants. The nature of this disease is fungal in nature. The danger is that the infection spreads throughout the bush, including the stem and other parts of the crop.
Black mold manifests itself at the initial stage by the appearance of small black spots on the leaves of cucumbers, which are most often oval in shape. After a while, they grow, completely affecting all the leaves. As a result, the whole bush falls ill, as evidenced by the appearance of a kind of black web on it.
- In order to prevent the appearance of pathology, the seeds are disinfected, which are being prepared for planting.
- In addition, the soil is cultivated, which can potentially be contaminated.
- Black mold can leave fungus on the greenhouse itself. Before planting seeds, it is necessary to disinfect the structure. To do this, use funds that can be purchased in a specialized store.
Diseases of cucumbers in the greenhouse (video)
Additional threats
Diseases of cucumbers and their treatment are associated with brown spot. The reason for the appearance is watering the vegetable crop with cold water (rainwater). Such a cucumber bears the disease hard because of the high level of humidity with frequent temperature fluctuations, as well as with temperature fluctuations during the day and night. A draft can act as a provoking factor. If the soil and the roof of the greenhouse are poorly disinfected, then the pathogen remains.
Small brown ulcers indicate the occurrence of brown spot. Such a disease of cucumbers provides for the release of a liquid mass. The ulcers can spread throughout the fetus and should not be eaten. Brown spot spoils all vegetables in a week.
If from the very beginning of the disease you stop watering the plant for 6 days, the cucumbers will not be susceptible to the disease. In sunny weather, the greenhouse needs to be ventilated. To do this, open the doors, and remove the film from the ridges. If the weather conditions are not very favorable, the temperature should be increased.
Root rot is also a threat. It rapidly infects the soil on which cucumbers previously grew. The manifestation of the disease is also observed with a significant decrease in soil temperature, irrigation of the culture with cold water. Root rot often occurs when seedlings are improperly planted.
The occurrence of infection is evidenced by wilting of the leaves both before the onset of the appearance of fruits and after their formation. Negative processes are clearly visible on sunny days. Moving the soil away from the stem, you can easily see the yellow color, the appearance of cracks. To prevent an ailment during planting operations, it is necessary to avoid covering the stem with soil: the exclusively nutritious area of the root is deepened. In the summer months, the plant is not subjected to hilling, the soil is not poured onto the stems, otherwise the death of the vegetable crop is provoked.
If the disease has appeared, you need to prepare the following composition: Combine 500 ml of water with 1 tsp. copper oxychloride (can be replaced with copper sulfate) and with 3 tbsp. l. honey or wood ash.
Greenhouse cucumbers are quite often susceptible to various diseases. To prevent them or to deal effectively with them, it is recommended to use the presented tips.