When grape brown spot control was
Grape brown spot occurs in various grape producing areas in China. It is affected by rainy and humid coastal areas and various provinces in the south of the Yangtze River. The incidence is generally lighter in dry regions or less rainy years. Poorly managed orchards in the late years of the rainy season can cause a large number of diseases and cause early defoliation. , affecting the tree-trend caused by reduced production.
Control methods: 1 Completely remove litter to reduce the source of disease. Spray 3 to 5 degrees lime sulfur before germination. 2 Reasonable fertilization, scientific pruning. Increase the use of multi-element fertilizers to increase tree vigor. Prune in time to maintain air and light. 3 spraying control. Severe disease areas combined with other disease prevention and control, 7 to 9 months can be sprayed 500 times 50% carbendazim or 600 to 800 times chlorothalonil alternately used every 10 to 15 days to spray a drug. 65% of mancozeb has phytotoxicity on certain grape fruits, more obvious in the north, and the use concentration should be 1000-1200 times.
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