Peronosporosis, or downy mildew is one of the most common problems gardeners. Affected pathogenic microflora vegetables begin to wilt quickly. If not promptly take measures to resolve the problem, then you can completely lose the harvest.
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symptoms
Symptomatology of the disease begins to manifest itself in the form of the formation on the surface of cucumber leaves yellow spots with vague contours. If you do not start the event on the treatment of vegetables, about 2 days there will be new signs of destruction of pathogenic microflora. On the outer side of the leaf is formed powdery gray-purple plaque. It contains fungal spores, which provoke further progression of the disease and wilting plants.
In the affected areas increase observed spots that change color to brown. If extensive lesions occur curling of sheets and drying them falling off. Cucumbers, which were hit by downy mildew can cause infections of other crops growing on the site.
Causes
The disease develops as a result of fungal microflora. Disputes may be contained in the seeds of cucumbers. They tolerate the cold and can overwinter in the soil. For this reason it is recommended in the autumn to remove from the site all the plants and disinfect.
Fungus activated by moisture. But not only the rainy weather is one of the reasons for the defeat of cucumbers. If the outside temperature changes occur (day and night), in the morning condensation on the plants. It serves as a breeding ground for pathogenic microorganisms.
plants often suffer from downy mildew, if growing on extremely nitrogen-rich soil, but lack of potassium and phosphate compounds.
prevention
To reduce the probability of hitting the cucumber downy mildew, it is possible to acquire any special hybrid seeds. On the resistance of plants to various diseases according to manufacturer on the packaging.
Prevention of downy mildew lesions is the acquisition of early varieties of cucumbers. With such horticultural crops can have time to harvest before the reduction begins night temperatures, i.e. the approach of autumn.
Viable spores remain for about 6 years. For this reason, to the beds were not pathogenic organisms, it is recommended to destroy the old bushes infected plants (burning). If you use them for compost, the infection will spread throughout the garden.
To cucumbers on plates, which grow in a greenhouse, did not form a condensate, the room must be ventilated. In rainy or cold summer plants should be treated to resist mildew growth, as well as substances that make a culture resistant to diseases.
If the cucumbers are sick
If you can not keep cucumbers from the disease, it is necessary to deal with it. Fungus afraid of copper, however it recommended for the treatment of crops defended dissolved in a bucket of water 20 g of copper sulfate and add 200 g of soap. If mildew struck cucumbers in late summer, when the bushes have already started to wither due to natural reasons, can not take action against pathogenic microorganisms. Peronosporosis only infects the leaves and does not affect the results. Therefore, the vegetables may have time to ripen in the garden on their own.
Cucumbers save from destruction will be possible with the help of such safe for human drugs:
- fitosporin;
- Baikal-EM1;
- kefir and iodine (1 l 1 drop).
To improve the effectiveness of drugs, they should be sprayed on the inner and outer sides of the leaves.
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