Cucumber colonization to prevent disease

1. Downy mildew. Cucumber can infect the disease during the whole growth period, mainly affecting the leaves. Because the lesion is limited by the veins, it is usually a polygonal brown or yellow-brown plaque, which becomes a very easy to diagnose disease.
The pathogens mainly overwinter on winter greenhouse crops and can occur on the anniversary in the protected area. The suitable temperature for the onset is 15 °C ~ 22 °C, the relative humidity is higher than 83%, and the leaf surface is easy to be sick when there are water drops.
Control method: In addition to the selection of disease-resistant varieties, it should be kept clean, reasonable close planting, high ridge cultivation, and humidity control. Under-film dark or drip irrigation, water-saving insulation, in order to help reduce the humidity inside the shed. Ventilation and moisture release as early as possible in the morning, pay attention to the balanced application of nitrogen, phosphorus and potassium fertilizers. For the prevention and treatment of pharmacy, a "fool prescription" for disease prevention and control based on prevention can be used. The prevention can be carried out by spraying 70% Dakening WP 600 times solution, 25% Amishida suspension 1500 times solution, 80% Dasheng wettable powder 500 times solution, 56% azoxystrobin chlorothalonil 800 times solution and the like. Immediately after the discovery of the central diseased plant, the drug was sprayed completely, and the diseased leaves were removed in time to be burned out of the shed. Treatment can choose 68% Jinlei water dispersible granules 500 ~ 600 times liquid, 40% Feige suspension 500 times liquid, 25% Ruifan suspension 1500 times liquid, 68.75% silver rose suspension 800 times liquid, 72% grams Anti-spirit 600 times liquid, 64% anti-bacterial vanadium wettable powder 500 times liquid, 69% Anke wettable powder 600 times liquid, 72.2% Plex water agent 800 times liquid, etc. Synchronous prophylaxis and treatment can also be carried out by adding 25% amishida suspension to 68% gold mine water dispersible granules.
2. Powdery mildew. The disease is also one of the easily accessible diseases of cucumber in the autumn season, and can be susceptible to disease during the whole growth period. The powdery mildew pathogens overwinter in the soil with the closed capsule and the diseased body, and can also overwinter on the greenhouse vegetables. Propagating by air, rain and watering, the environment of warm, humid, rainy weather and dense planting is prone to epidemics, flooding with large water, high humidity, insufficient fertility, and severe debilitation in the late stage of plant growth.
Control methods: Appropriate application of biological bacterial fertilizer, phosphorus and potassium fertilizer, strengthen field management, reduce humidity, enhance ventilation and light transmission. Chemical control can take 25% Amishida suspension 1500 times solution, 75% Dakoning WP 600 times solution, 10% Shigao water dispersion granules 2500 ~ 3000 times solution, 32.5% phenyl ether Cycloboloxazole Ester suspension 1500 times solution, 80% large WP 600 times solution, 43% bacteria gram suspension 3000 times solution, 2% added rice water 400 times solution, 40% Fuxing emulsifiable concentrate 4000 times liquid spray. Yan Ningning