黄瓜霜霉病(1)日出后棚温控制在25￣30℃,通风使相对湿度降到60%￣70%;下午温度降至20￣25℃,相对湿度降到70%左右。(2)发病初期,选择晴天中午关闭大棚,使棚内黄瓜生长点附近的温度上升到45℃但不超过47℃,维持2￣3小时,然后逐步通风降温。闷棚处理时要求土壤含水量和棚内湿度 Cucumber downy mildew (1) After sunrise shed temperature control at 25 ~ 30 ℃, ventilation to make the relative humidity reduced to 60% ~ 70%; afternoon temperature dropped to 20 ~ 25 ℃, relative humidity dropped to 70%. (2) In the early stage of disease, we choose to close the greenhouse at noon on a sunny day and raise the temperature near the growing point of the greenhouse to 45 ℃ but not more than 47 ℃ for 2 ~ 3 hours and then gradually ventilate and cool down. Nausea shed processing requirements of soil moisture and greenhouse humidity