Watermelon anthracnose is a major disease in watermelon production in greenhouses, and it is also a disease that is difficult to control. It can occur during the whole growth period of watermelon. Especially in the middle and late stages of plant growth, it will cause the deciduous dead or even fruit rot of the watermelon, which will have a great impact on the yield and quality of watermelon in the protected area. According to the survey, in general years, no control can reduce production by 20% to 30%, and in heavy years, production can be reduced by more than 50%. Therefore, investigations should be strengthened and timely prevention and control should be implemented.
The main symptoms
Leaf margins, petioles, and veins form a round or elliptic hazel brown to gray-brown large lesion. The lesions are dry and easily broken, and numerous small dark particles are formed on the lesions. The fruit first appeared as a small, oily spot, which turned dark brown in the near future. The central part was brown withered. The interior was corked and black spots formed on the lesion.
Prevention
Agricultural measures: Apply sufficient organic manure and cake fertilizer, do a good job of formulating N, P and K fertilization, supplementing application of trace fertilizers, increasing biological fertilizers, spraying foliar fertilizers during the growing season, and improving the resistance of watermelon plants. The use of small water pouring or drip irrigation method, to avoid flood irrigation, timely drainage and ventilation, the use of longevity no drip film, reduce the humidity within the greenhouse, timely removal of diseased leaves, diseased fruit in the early stages of disease, the removal of seriously ill plants and brought to the shed for outdoor destruction or Deep digging to control the spread of the spread.
Chemical control: 50% thiophanate-methyl wettable powder 700 times, 75% chlorothalonil wettable powder 700 times, 50% benomyl wettable powder 1500 times, or 80% anthraquinone WP 800 times liquid, or 65% zeocin zinc wettable powder 600 times, or 2% agricultural water 120 times 200 times, or 77% can kill 600 times spray, spray 7-10 days, even spray 2-3 times. The above agents are used interchangeably.
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