The Prevention and Control of Diseases and Pests of Red Grape in America
2018-06-19 20:01:03
July-August is the peak period of grape incidence in a year. During this period, the control of pests and diseases not only had a great impact on the growth of the plants in the year, but also had no impact on the control of pests and diseases in orchards in the following year. The prevention and control of grape diseases should be based on prevention and comprehensive prevention and treatment. During this period, the main diseases of red grape are: downy mildew, powdery mildew, brown spot, black rot, and blackpox. First, the symptoms and prevention measures 1. Grape downy mildew disease The disease mainly damage leaves and shoots. Symptoms: irregular yellowish spots appear on the front of the leaves, yellow-green patches gradually develop, and the edges are not obvious; yellow-white molds appear on the back of the leaves. At the end of the disease, it was dry, curly and necrotic and pale brown. ? Control methods: 1 Agricultural anti-120 pharmaceutical 200 to 300 times the liquid; 285% of the three aluminum phosphorus aluminum 700 to 800 times the liquid; 340% of the Swiss poison mold 200 to 300 times the liquid; 4 anti-virus 200 to 300 times liquid. ? 2, grape powdery mildew? The disease mainly damage leaves, young shoots and young fruit. Symptoms: The leaves have gray lesions on the front surface, which vary in size. They quickly expand into irregular large lesions covered with grayish white powder. In severe cases, the whole leaf is covered with white powder; the leaves are brown on the back. spot. ? Control methods: 1 agricultural anti-120 agent 200 to 300 times the liquid; 250% thiophanate-methyl 800 times; 325% triadimefon 500 times. ? 3, grape brown spot? The disease damage leaves. According to the lesion size and pathogens can be divided into large brown spots and small brown spots. Symptoms: large brown spots, lesions near-circular, 3 to 10 mm in diameter with a brown ring at the center, sometimes with a yellow halo outside. When the weather is wet, the dark brown mold layer is scattered on the surface and back of the lesion. China Agricultural Network Editor
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