Prevention of watermelon leaf blight in rainy season

Due to the continuous low temperature in recent days, coupled with continuous rainfall, watermelon leaf blight is currently occurring seriously, and all watermelon production areas are affected. Watermelon leaf blight is a leaf disease that harms watermelon. In recent years, it has gradually increased. In the middle and late stages of watermelon growth, especially in the rainy season or after a heavy rain, the incidence is often rapid and rapid development, so that the melon leaves quickly change Black scorch and loss of photosynthesis capacity seriously affect the quality and yield of watermelon. Watermelon leaf blight mainly damages the leaves of watermelon, and the cotyledon occurs at the early stage of the onset of immersed water in the leaf margin, and then turns into a light brown to brown round or semicircular immersion lesion, extending to the entire cotyledons. Dry. In the early stage of the onset of true leaves, there are obvious water-soaked spots between the leaf margins or veins at the back of the leaves. The temperature is high and the leaves are dehydrated. The temperature is small and the temperature is high. It is easy to form a circle with a diameter of 2 to 3 mm to a nearly circular shape. Brown spots, covered with foliage, after the integration of large spots, the disease thinning, the formation of dead leaves phenomenon. The vine spreads, resulting in a diamond-shaped or oval-shaped depression, which can gradually cause deeper rot in the flesh. When the temperature is high, the disease minister produces grayish black to the black moldy layer. The disease is a fungal disease. Pathogens can be affected by temperatures ranging from 10°C to 36°C and relative humidity higher than 80%. Rainy weather, when the relative humidity is higher than 90%, is susceptible to epidemics or occurrences, such as during the expansion of watermelons. , Can make a large area of ​​melon field leaves dead, seriously affecting the yield. Continuous cropping, partial or re-application of nitrogen fertilizer, soil thin or water, weak plant disease resistance, disease severity. Continuous sunshine, long sunshine, inhibition of the disease. Control methods: spraying 75% Baifenqing WP 500～600 times, 50% acetaminophen WP 1000 times, one ten-thousandth of fengfeng 481, after onset or humidity. Large time can be sprayed 80% of Dasheng M-45 wettable powder 600 times liquid, one ten-thousands of rich 481,50% fast-king WP 1500 times, 70% mannose WP wet powder 400 ~ 500 Double fluid. Spray once every 5 to 7 days, even spray 3 to 4 times, and pay attention to the rain after the spray and field drainage. 481 can effectively reduce drug damage, promote growth, reduce the incidence of disease.

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