Maize dwarf mosaic virus disease is a viral disease that severely affects corn yield. The disease virus spreads through the spread of aphids. The locusts migrated to the corn fields to take drugs and transmit the virus. After a large number of breeding, the maggots turned to harm and could easily cause the epidemic. In the whole growth period of corn can be infected by the disease, when the seedlings can be infected when 1 to 2 leaves, the most serious damage in the seedling stage, after planting head disease resistance significantly increased, the incidence of lighter damage, generally does not lead to large occur. Generally, 3 to 7 leaves are the most severely affected. They start to appear chlorotic dots on the base of the heart, and then spread to the entire leaf. The leaf color is uneven and the veins are green. The leaves lose their green and turn yellow, forming yellow-green stripes. The common name is also called mosaic leaf streak disease. Severely diseased strains grow slowly, yellow and weak, and they can't draw and cuddle and die prematurely. The main prevention and control method of the disease is:
1, according to local conditions, a reasonable selection of disease-resistant, disease-resistant varieties.
2, appropriate sowing, strengthen field management, timely cultivating grass, found that diseased plants in a timely manner, can reduce the host of the virus, reduce the incidence.
3. Drug control: In the initial and prosperous period of the transfer of poisonous locusts into the corn field, spraying 50% omethoate EC 800 times or 50% WP WP 3000 times, 10% imidacloprid WP 2000 Double fluid. In the early stages of the development of corn dwarf mosaic virus disease, antiviral agents such as 7.5% gramin, virus A and 83 antagonism agents should be selected in time, and sprayed with plant powers 2003, Nongjiabao and other foliar fertilizers, and sprayed every 7 days. Times.
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