First, dehumidification: Due to the large humidity in the greenhouse, especially in the condition of cucumber leaf surface droplets, downy mildew, keratopathies and other diseases occur rapidly, so to reduce the air humidity inside the shed to 80%, and maintain About 4 hours, it can inhibit the occurrence of diseases. The method of artificial ventilation is mainly used to open the shed door and the side tuyere to increase the air circulation inside and outside, so that the humidity inside the shed is reduced, and the amount of ventilation should not be too large, so as not to reduce the temperature in the shed and affect the growth of cucumber.
Second, warming: downy mildew, anthrax, powdery mildew and other diseases, the incidence of the appropriate temperature in the 20-30 °C, so the greenhouse temperature is controlled at 30 °C above, and maintain for some time, you can suppress the occurrence of the disease. Mainly in the greenhouse cucumber transplanted about 40 days after the close of the gate and the side of the wind Yan gate, before and after noon, so that the temperature within the shed control at about 42-45 °C, and lasted 2 hours. Be careful to keep the soil moist during the high temperature drapery period.
Third, smoke: smoked with chlorothalonil pesticides, can be a good control of greenhouse cucumber downy mildew and powdery mildew. Using the evening time, a chlorothalonil was hung with lead wire at intervals in the shed, and then a piece of chlorothalonil was ignited from the inside to the outside. After lightening the smoke, the shed was closed tightly to prevent smoke from leaking.
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