With the continuous increase of temperature, the downy mildew of cucumber in vegetable greenhouses is more serious. The average daily temperature is 18 to 24 degrees, and the disease spreads faster when the relative humidity is above 80%. At present, it is the vigorous growth of cucumbers. Do not see the occurrence of diseases and control them again.
First, 5% chlorothalonil dust should be used before the onset of disease. At the beginning of the disease, 7% anti-mildew dust agent should be used, 1 kg per mu, in the evening, once every 7 days, and sprayed 4 to 5 times. If the disease is more serious, it is necessary to pay attention to the rational use of protective agents and therapeutic agents, mainly to protectants, and to add appropriate therapeutic agents, otherwise it is difficult to control the disease. The methods for controlling cucumber downy mildew mainly include the following methods: 75% chlorothalonil wettable powder 600 to 1000 times and 25% metalaxyl wettable powder 800 times can be used. Or 70% mancozeb WP can be 600 to 1000 times plus 25% metalaxyl WP 800 times. Or use 50% amaolic copper wettable powder 600 to 700 times, every 7 to 10 days, and even spray 3 to 6 times, cucumber downy mildew will be well controlled.
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