Watermelon leaf blight mainly damages the leaves of watermelon. Cotyledons were mostly infected at the beginning of the leaf margin, and then became light brown to brown. Round or semicircular lesions extend to the entire cotyledons and dry out. Germs can be affected at temperatures of 10-36°C and relative humidity higher than 80%. Rainy weather and relative humidity higher than 90% are more prevalent or occur. Late watermelon growth - watermelon enlargement period, can make a large area of ​​melon field leaves dead, seriously affecting the yield. Spray 75% chlorothalonil wettable powder 500-600 times liquid, 50% acetaminophen wettable powder 1000 times before the onset of disease or before the onset of rainfall. After the onset of disease or when the humidity is high, 80% of MDS can be sprayed. Wet powder 600 times, 50% fast-inking wettable powder 1500 times, 70% mancozeb wettable powder 400-500 times, spraying liquid 60 kg every 667 square meters, every 5-7 days Spray 1 time, spray 3-4 times, and pay attention to supplement spray and field drainage after rain.
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