In the autumn and winter, greenhouse cucumbers are marketed before the Spring Festival and have high economic value. However, wilt, epidemic, downy mildew, anthrax, powdery mildew, and bacterial keratoses significantly affect their yield and quality.
Cucumber downy mildew can cause the whole plant to die in one or two weeks, and the production loss in popular years can reach about 50%. When the cucumber is infested, the surface is unevenly green and yellow.
Severe incidence of cucumber wilt disease up to 80%. The typical symptom of the disease is wilting, which usually occurs after the flowering of the plant.
Cucumber diseases are more common in the base of the vine and the tender base. In the early stages of the disease, green spots of water stains are generated, and later expanded into round, large lesions. The fruit forms water-stained lesions in dark green near-circular depressions.
Anthracnose caused by cucumber cucumber seedlings fall, the latter can cause stems and leaves withered, fruit shape becomes smaller, often cracking and rot.
The prevention and control methods for greenhouse cucumber diseases are as follows:
Seed treatment: soaking in 55-degree warm water for 15 minutes or soaking in 100-fold formalin for 30 minutes before sowing, washing with water and sowing.
Rational rotation: Continuous work should be avoided. Rotation should reach more than three years.
Strengthen cultivation management: Control of indoor humidity and temperature can reduce the occurrence of diseases. To use resistant varieties.
Sapling Grafting: High-resistance varieties of black squash are used for rootstock grafting. The grafted plants grew robustly, with increased resistance to disease and resistance.
High-temperature treatment: In the early or middle period of downy mildew, the closed greenhouse was selected on a sunny day, and the greenhouse was raised to 44-46 degrees for 2 consecutive hours. After treatment, the temperature was reduced and the management was strengthened.
Pharmacy prevention and control: Chemicals should be treated in a timely manner, and the right medicine should be prescribed. Spraying should not only spray the plants, but also spray the ground or irrigate the roots to destroy the bacteria in the soil. The commonly used agents include 25% chlorothalonil wettable powder 600 times, 65% zinc WP wettable powder 400 times-600 times, and 50% cefotaxime WP 500 times.
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