Referring to the damage caused by white rot in grapes, recently, Liu Zhaoqiang, president of the Shaanxi Fruit Industry Association, said in an interview with reporters that white rot disease is one of the major diseases that often occur in grape production areas in China. The disease mainly affects the ear. It also harms shoots and leaves. Losses of 15% to 20% in normal years, and in the event of high temperatures, rain, high humidity, or locust-resistance in the summer, the disease will be greatly affected, which will seriously affect the output.
The law of incidence
Grape white rot is one of the most serious diseases caused by grape diseases. The pathogenic bacteria in the surface and the sick and the wintering, generally in early June the beginning of the ear from the ground near the tip of the disease, 7-8 months of high temperature and rain, especially in the event of a storm or hail, often cause a pandemic. High temperatures, rain, high humidity and wounds are important conditions for the high incidence of diseases. The length and duration of the disease will depend on the length of the morning and evening and the duration of the rainy season. In general, the incidence of heavy rain in heavy rains, especially after the disaster, can easily cause white rot. It is also known as “hailosisâ€.
Control methods
1. Clean orchards: timely remove sick ears, diseased fruits, diseased branches and leaves, and concentrate deeply. After the autumn, the litters were cleared, and they were burned and buried deep inside the circular area to reduce the source of the disease. Control humidity, maintain good permeability, strictly control the amount of fruit, keep a good vigor, appropriately improve the results, use bagging technology, formula fertilization and use of farmyard fertilizers.
2. Chemical control: After the flower is sprayed with 600-800 times dilution of strong white rot, it can effectively prevent white rot and blackpox. Before bagging, white rot pathogens come from the soil and wounds are invaded. Therefore, before bagging, the 500-600-fold dilution of strong white rot is used to spray and dip the ear, especially for the ear that is closer to the ground. . It has significant control effects against white rot, anthrax, and gray mold, and has a significant effect on promoting fruit enlargement. Conditions can be used with amino acids or organic potash compound. During the maturation period, due to the unique bactericidal mechanism of strong white rot, the use of radix acid or organic potash is compounded. During the maturation period, due to the unique bactericidal mechanism of strong white rot, it is not easy to produce resistance to diseases and has a significant role in promoting growth. It can be used throughout the growing period. Disease prevention diluted 600-800 times, treatment diluted 400-600 times spraying. The powerful white rot has a very stable biochemical performance and can be used in combination with various pesticides and liquid fertilizers.
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