Cucumber downy mildew is a major common disease in greenhouse cucumbers, and it is high in spring from March to May. In prevention and control, we must start from the following aspects:
1. Reduce humidity. Watering should be done on a sunny morning. After pouring, the enclosure should be heated to 33°C. After maintaining for 1 hour, it should be ventilated and cooled to 25°C. This can reduce the humidity repeatedly. When the outside temperature reaches 10°C, it can be ventilated for 1 to 2 hours after the sunset by using the method of removing the humidity at the top of the small bottom, or it can be ventilated and evacuated under the draughts of the grass at night. When the temperature rises above 12°C during the night, it can be ventilated and ventilated overnight, and the amount of ventilation should be gradually increased to avoid excessive force.
2. Variable temperature management. During the day, the temperature is controlled at about 24°C and the temperature at night is about 16°C.
3. Chemical control. On a rainy day, use 10% chlorothalonil smoke agent per acre or sprinkle 10% powdery mildew powder 300 grams. On sunny days, use 64% antivirus 400 times liquid or 72% DuPont Kelu 600 times alternately and spray once every 5 to 7 days. At the same time, combine 10% white sugar and 1% urea mixture on foliar.
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