What are the control methods for downy mildew in melons?

A melon grower from Xinnong Town called the hotline to ask how to control downy mildew in melons. Wang Chunhua, an agronomist at the Municipal Agricultural Technology Extension Center, answered that high humidity is the main cause of downy mildew. Once individual plants become diseased, the disease will quickly spread to other plants, so control must be carried out immediately at the early stage of the disease. For chemical control, 72% Kelu wettable powder at 800 times dilution, or 64% Anke wettable powder at 1000 times dilution can be sprayed. If rainy weather occurs, greenhouse melons can be controlled by fumigation. The specific method is to divide 300 grams of 45% chlorothalonil smoke agent into 6-7 portions after the curtain is lowered in the evening, distribute them evenly inside the greenhouse, and then light them for fumigation. Treat once every 7-10 days, for a total of 3-4 treatments.