A: It may be caused by white rot in grapes. Control methods: 1. Clean the orchard to reduce the source of bacteria. 2. Improve shelf surface, ventilation and light transmission, timely pruning, fork-lifting, and topping. Minimize wounds and increase the distance between the ear and the ground. Black plastic film covers the floor 60% of the ground. Pay attention to drainage to reduce the humidity of the ground. Spraying potassium dihydrogen phosphate and other foliar fertilizers and applying compound fertilizers to roots to increase tree vigor and increase resistance to diseases can suppress the occurrence and prevalence of diseases. Ears close to the ground can be bagged. 3. Chemical control. From the beginning of flowering to before harvesting, spray the medicine every 15 days to 20 days. The 1:0.5:200 type of Bordeaux mixture, 80% of Daisen 600 times, 75% of Dakkonin 600 times, and 12% of green copper lactone 800 times are used interchangeably. The application must be made with spikes and grains and medicine.
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