There are phenomena of melon melting and edge withering. Cucumber turned into melon. Too much nitrogen fertilizer, insufficient phosphorus, potassium and boron fertilizer, low temperature, little light and high humidity, can not pollinate and fertilize normally. Spraying potassium dihydrogen phosphate and borax on the leaves to promote pollination and fertilization can reduce the melting phenomenon of melon. Use Zhongshengmycin, ethylicin, polyoxin, agricultural streptomycin or octylamine acetate, or chlorobromoisocyanuric acid, or cuprammonium chlorate, or copper clothianidin, or copper Tai Sen, or copper quinoline, or copper hydroxide, or cuprous oxide, or cuprous chloride, or metalaxyl, or cuprammonium chloride, or copper rosin to treat cucumber leaf blight and diseases caused by bacterial infection.