Spring from March to May is the high season of cucumber downy mildew. Cucumber downy mildew is a major common disease in greenhouse cucumbers. In terms of prevention and control, the Chinese pesticide network Xiaobian understands to start from the following aspects:
1. Reduce the humidity. Watering should be carried out on sunny days in the morning. After pouring, the enclosure will be heated to 33 °C. After 1 hour, the air will be cooled down to 25 °C. This can reduce the humidity repeatedly. When the outside temperature reaches 10 °C, after sunset, the top can be ventilated for 1 to 2 hours with the method of small bottom air discharge, or it can be ventilated and ventilated under the straw at night. When the night temperature rises above 12 °C, it can be ventilated in the day and night, pay attention to the ventilation volume should be gradually increased, not too strong.
2. Variable temperature management. During the day, the temperature is controlled at around 24 °C, and the night temperature is controlled at around 16 °C.
3. Pesticide control. On a rainy day, use 10% chlorothalonil smoke agent per acre or spray 10g of 10% downy mildew powder. On sunny days, use 64% anti-virus 矾 400 times solution or 72% DuPont gram dew 600 times alternately spray, spray once every 5 to 7 days, and spray 10% white sugar plus 1% urea mixture on the foliar surface.
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