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Many gardeners, especially beginners, believe that growing cucumbers in a greenhouse will allow protect plants from many diseases, and it will protect against pests much better than in open ground conditions.
This is not entirely true. Let's try to talk about what dangers lie in wait for your planting in the greenhouse, what diseases and pests can threaten them, ways to protect against pests, ways of treatment and prevention of diseases of cucumbers.
Diseases: description and control measures
The diseases encountered in the greenhouse, when growing cucumbers, are not limited to one name. Let's talk about the most common... These include:
- rot is white and gray;
- root rot;
- dew: downy and powdery;
- brown spot (olive);
- leaf mold (black).
Let us consider in more detail the diseases of cucumbers in the greenhouse and their treatment with illustrative examples in the photo.
Causative agent plant diseases is a fungus... A sign of a lesion is a fluffy coating of white in all parts of the plant, from roots and lashes, to leaves and fruits. Secreted by the fungus substances not only destroy plants, but also stored in the ground a very long time.
Over time, the affected plant tissue decays completely. It is difficult to fight this disease, but it is quite possible. Control measures are the removal of all remnants of the affected plant, old fruits, leaves. Complete replacement of soil is desirable at the planting site of cucumbers.
Useful information about white rot on cucumbers in the video:
A sign of gray mold damage is the appearance of gray, slippery spots on the fruit. The infection then spreads throughout the plant. Fruits, ovary, flowers are most affected... Control measures are the same as for white rot.
Only the need for pollination in the initial stages of the disease with a mixture of copper sulfate (one teaspoon) with a glass of wood ash is added. Spraying will help, with strict observance of the instructions, with a preparation of the "Barrier" type. The drug is not harmful to humans and animals.
Important: even in the absence of fungal infections, it is recommended to change the soil in the greenhouse every two years. Replace the surface layer of soil (about 20 centimeters) with a mixture of earth, peat, sand. Good drainage is important and soil fertility.
Very often, this disease manifests itself when planting cucumber seedlings in a greenhouse. Occurs due to deep planting, may come to light when carrying out additional hilling plant stems. The disease develops very quickly, especially if the seedlings were planted on the soil where cucumbers used to grow. Watering with cold water or a sharp drop in soil temperature can provoke the disease.
Indicator of disease there are spots on the leaves, which are especially visible after a prolonged bad weather. Cracking and a clearly visible yellow color of the stems are also a sign. Cracking and discoloration clearly visible if you shake off the ground from the stem in the holes.
Control measures are the observance of the rules when planting seedlings. The stem of the plant above the root should not be buried in the ground. Also experienced gardeners it is not recommended to add soil in the holes, at which the stem of the plant is filled up.
The affected tissue is clearly visible when you shovel the soil off the plant stem. The lesions can be sprinkled with crushed chalk or coal, wood ash. After that it is required dry the affected areas... During the next watering, do not allow the stems to fall asleep with earth, water only the soil in the hole, preventing moisture from getting on the affected stems.
Completely dead stems are removed with a clod of earth. Pour the remaining hole with an aqueous solution of copper sulfate, prepared in the following proportion: for 5 liters of water, 20 grams of copper sulfate. Burn the dead plant.
Useful information about root rot on cucumbers in the video:
Affected cucumber stalks covered with white bloom... The lesion is caused by a fungus. Leaves are affected first. Further, the disease spreads to the stems of plants. The next stage of the disease is drying and dying off of leaves and stems... An excellent drug for the fight is Topaz. The drug is available in ampoules, the contents of which are dissolved in eight liters of water.
The resulting solution is sprayed on the affected plants. Treatment with a solution can be carried out not only with the manifestation of signs of the disease, but also for the purpose of prevention.
Possible treatment with the drug "Zaslon"which is very effective in showing signs of the disease.
The solution for spraying is prepared from the calculation - three caps of the drug are dissolved in a liter of water.
Attention! For the prevention of diseases, especially with large processing areas use biologics... Such as Alirin-B, Gamair, Glyokladin, Trichocin. Remember to strictly follow the instructions for use of the drugs.
Useful information on powdery mildew on cucumbers in the video:
The causative agent of downy mildew remains in the ground for a long time, may appear in 5-7 years after the first illness. A sign of infection is the appearance of spots on the leaves, similar to burns. In the future, the leaves will melt brown. Drying of affected leaves very fast, no longer than 2-3 days.
Watering with cold water or a sharp drop in day and night temperatures, high humidity in the greenhouse at night can provoke infection. Control measures serves to stop watering and making dressing. Ventilate the greenhouse to reduce humidity.
Against the pathogens of downy mildew, the drug "Quadris" is perfect. Dissolve five grams of the drug in a bucket of water, then spray the cucumbers.
Useful information about downy mildew on cucumbers in the video:
Brown spot (olive)
Most often defeat manifests itself on the fruits of plants... The signs are the appearance of brown defects, from which the fluid flows out. If no protection measures are taken against the causative agent of the disease, all plants in the greenhouse may die within a week.
High humidity, the presence of drafts, excessive watering, and a strong temperature drop during the day can provoke infection. To fight the disease night drafts should be excluded, for 5-7 days, stop watering, in the daytime, warm time of the day, to prevent the appearance of condensation, ventilate the greenhouse.
Leaf mold (black)
Defeat plants causes funguslocated on the inner surface of the coating and in the soil of the greenhouse. Leaves are most often affected first. In the future, the disease spreads to all parts of the plant that are above ground level.
Spots appear on the leaves, gradually merging into one. The affected leaves dry out, subsequently covered with a bloom of black, very similar to a spider web. Measures of struggle are disinfection of the greenhouse inside, replacing soil in cucumber ridges, dressing seeds or using varieties resistant to disease.
The most common pests of cucumbers in greenhouses are melon aphids and spider mites.
Shrinking and curling of leaves cucumbers most often say about the defeat of melon aphids. Yellow spots appear on the leaves, the leaf curls up. When viewed on the bottom of the leaf, you will see aphid larvae of various colors. Having chosen a plant, aphids sucks juices, slowing down its growth and development.
The development of numbers is very fast and aphids are spreading over all planted plants. If aphids are found on cucumbers in a greenhouse, the control measures are as follows - in order to protect plantings, it is advised to use an infusion of onion peels, which will destroy aphids in your greenhouse.
For guard from pests when it is necessary to process large areas use insecticides produced by the industry.
Spider mite infestation leads to drying out of leaves and stems, and subsequently the complete death of the plant. You can determine the defeat of a tick by the cobweb on the leaves and stems of cucumbers. When a spider mite is found needs to be processed quickly planting in the greenhouse. A spider mite on cucumbers in a greenhouse, without taking measures for its destruction, can lead to the loss of all planted cucumbers.
The most effective removal of completely affected plants, followed by their burning. If a single plant is damaged, it is necessary to cover it with a film or cloth by placing a container with turpentine inside.
Instead of turpentine, you can place chopped garlic next to it. The smell will destroy the aphid colony on the plant. Processing must be carried out repeatedly, with a break of 2-3 days.
Timely detected damage to the bushes in your greenhouse by fungi or pests, with timely processing, it will help preserve plants.
And by keeping the planting, you will not be left without a harvest of cucumbers.