Prevention and treatment of cucumber diseases in greenhouse

August 27 10:04:03, 2022

I. Dehumidification: Due to the high humidity in the greenhouse, especially under the condition of water droplets on the surface of cucumber leaves, diseases such as downy mildew and angular spot disease occur rapidly. Therefore, the air humidity in the shed should be reduced to below 80%, and kept. About 4 hours, it can inhibit the occurrence of diseases. Mainly adopt artificial ventilation method, open the shed door and side vent to enhance the air circulation inside and outside, so that the humidity in the shed is reduced, and the ventilation should not be too large, so as not to reduce the temperature inside the shed and affect the growth of cucumber.
Second, increase temperature: downy mildew, anthracnose, powdery mildew and other diseases, the appropriate temperature for the onset is 20-30 ° C, so the temperature inside the shed is controlled above 30 ° C, and maintained for a period of time, can inhibit the occurrence of disease. Mainly in the greenhouse for about 40 days after the transplanting of cucumbers, the shed door and the side vents are closed. Before and after noon, the temperature in the shed is controlled at about 42-45 °C for 2 hours. Be careful to keep the soil moist during the high temperature stagnation period.
Third, fumigation: smoked with chlorothalonil pesticides, can well prevent the occurrence of cucumber downy mildew and powdery mildew in greenhouse. In the evening, at the interval of the shed, a chlorothalonil is hung with lead wire, and then one piece is ignited from the inside to the outside. After the cigarette is smoked, the shed is closed and the smoke is extravasated.

From: China Agriculture Network
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