One of the common diseases of cucumber in winter in greenhouses is powdery mildew, virus disease and downy mildew. Now we introduce the prevention and treatment methods to everyone.
1. Powdery mildew. Powdery mildew is mainly harmful to the leaves, white round spots appear on the front of the leaves, and the whole leaf is covered when serious. Powdery mildew develops rapidly under the proper temperature conditions, causing the decline of photosynthesis in the leaves. The premature decline of cucumber has a great impact on the yield. Prevention and control measures: selection of disease-resistant varieties; strengthening management, reasonable control of greenhouse temperature and humidity; chemical control can choose carbendazim, chlorothalonil or Shibuya higher spray control. Farmers need to combine early detection, early detection, and early prevention and control with plant growth in the shed to control the disease at the source.
2. Viral disease. The diseased plant leaves yellow and green, and the disease usually occurs first from the heart and leaves of the plant. There are two main causes of the disease: one is the transmission of poisonous insects such as aphids and whitefly; the other is the lack of zinc fertilizer. Control measures: Cucumber virus disease can be chemically sprayed with ningamamycin, while chelated zinc fertilizer is used to increase plant resistance. Farmers often use viruses and other agents such as virus A to passivate the virus and have a poor control effect.
3. Downy mildew. Cucumber downy mildew is easy to be confused with keratopathies. The discrimination method is that keratoses are limited by leaf veins. When the leaves are facing the sun, the lesions are thin and there is no mildew layer, while the downy mildew is not seen at the spots when facing the sun. Thin and mildew. Prevention and control measures: You can choose silver and other agents, and spray it twice every 10 days or so.
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