A: From the picture, it may be white rot. Grape white rot is one of the most important diseases in grape production. It occurs in all grape producing areas in China. The damage to the old Yellow River in North China and Northeast China is serious. Fruit loss often reaches 20%-40%, and individual orchards lose more than 90%. As the fruit enters the coloring and maturation stages, its degree of susceptibility gradually increases. There is also a great relationship between the location of the ear and the disease. Ears close to the ground are susceptible to infection by overwintering pathogens. At the same time, the lower part is poor in air and light, and has high humidity and is prone to induce diseases. The epidemic is strong, and the high-temperature and high-humidity climatic conditions are the most vulnerable to disease. Especially after a storm or a locust plague, a large number of wounds are more susceptible to the disease.
Control methods
Clean up the orchard to reduce the source of bacteria.
Improve racking, ventilation and light transmission, timely pruning, fork-lifting and topping. Minimize wounds and increase the distance between the ear and the ground. Under the floor, cover the black ground film to occupy 60% of the ground. Pay attention to drainage to reduce the humidity on the ground. Spraying potassium dihydrogen phosphate and other foliar fertilizers and applying compound fertilizer to roots, enhancing tree vigor, and improving resistance to disease can suppress the occurrence and prevalence of diseases. Ears close to the ground can be bagged.
Chemical control. Pour 3-5 degrees lime sulfur or 45% crystal lime sulfur 40-50 times before sprouting grape buds without germination. From the beginning of flowering to before harvesting, spray the medicine every 15 days to 20 days. 1: 0.5: 200 type of Bordeaux mixture, 80% of Tai Seng 600 times, 75% of Dakkoning 600 times, 12% of green copper copper 800 times alternately. The application must be made with spikes and grains and medicine.
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