How to prevent and cure melon downy mildew?

A melon farmer in Xinnong Town called the hotline to ask how to prevent and control downy mildew. Wang Chunhua, an agronomist at the Municipal Agricultural Technology extension Center, replied that high humidity was the main cause of downy mildew, and once individual plants fell ill, it would soon be transmitted to other plants, so it should be prevented and treated immediately at the initial stage of the disease. The medicament can be sprayed with 72% Kelou wettable powder 800x liquid or 64% Anke wettable powder 1000 times liquid. In case of cloudy and rainy days, muskmelons in the greenhouse can be controlled by fumigation. The specific method is to divide 45% of chlorothalonil aerosol 300 grams into 6-7 portions, evenly distributed in the greenhouse, and then ignite fumigation. Prevention and treatment should be done every 10 days, for a total of 4 times.