Prevention of Downy Mildew in Cucumber in Winter Warming House
The resistance to downy mildew in different varieties of cucumber resistant varieties was very different. Generally, the resistance of early-maturing varieties was worse than that of late-maturing varieties. The disease-resistant varieties include Jinyan No.2, No.4 and No.6, Jinza No.1 and No.2, and Jinchun No.2. In the promotion and planting of disease-resistant varieties, we must pay attention to controlling the occurrence of wilt disease.
Cultivating and managing control Cultivate age-appropriate, disease-free and strong seedlings, select high-lying, well-drained plots, apply enough base fertilizer, topdressing nitrogenous fertilizers, and apply 1% urea at the later stage to improve plant disease resistance. Pre-fertility less watering, more cultivator, increase the temperature.
High temperature stuffy shed winter shed cucumber can be used after the general incidence of high temperature stuffy shed, select sunny morning closed shed, so that shed temperature rose to 45 °C, lasted 2 hours, and then properly ventilated, so that the temperature gradually decreased to the normal temperature shed.
Ecological control Every morning, the air is released for about 1 hour. The temperature in the morning is increased to 28°C~33°C. When the temperature exceeds 35°C, the air is released. At noon and afternoon, the temperature drops to 20°C~25°C, relative humidity is 65%~70%, and the air is released in the evening. 3 hours, then close the shed, so that the temperature dropped to 1 °C ~ 12 °C. Watering is required in sunny mornings, watering in the morning, closing the shed immediately after pouring, raising the temperature to 35°C to 40°C, releasing the air, closing the shed once, and raising the temperature to release the air.
Smoke prevention and control use 40% chlorothalonil smoke agent to smoke, in the evening after the closed greenhouse, the drug is divided into 4 to 5 copies, each 50 grams, evenly distributed in the shed, ignited with dark fire, smoke closed the windows and doors, times The morning ventilation, smoked once every seven days, depending on the condition for 3 to 6 times.
In the early stage of spraying, the protective fungicide and the systemic fungicide are alternately used, and can be sprayed with DF500 times or 72.2% Prec 800x and 75% chlorothalonil 600 times 64% antivirus 400 times. Interval 7~10 days.
Foliage Spraying Cucumber The late growth period can be sprayed with 1% urea and the same amount of white sugar solution, should be carried out in the morning, sprayed once every 5 days, a total of 4 sprays, pay attention to spray on the back of the leaf.
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