Rape virus disease prevention and control method

Rape virus disease prevention and control method

First, the symptoms of the disease mainly caused by aphid infection virus. Due to different varieties of rape, the symptoms are not the same. Local rapeseed (cabbage or mustard type) disease, green leaves on both sides of the green, yellow and green leaves, showing obvious mosaic symptoms, adult plants deformity. When the disease is severe, the leaves are curled or deformed, and the diseased plants are obviously dwarfed. Most of them are dead before or during convulsions. In the case of B. napus, small spots appeared on the new leaves at the beginning, and later developed into a nearly circular yellow spot. When the diseased leaves are yellow, the spots are still clearly visible. Severe onset, the stem produces water stains, dark brown, withered stripe spots. The sickness was bent and the seriously ill strain died early. Second, the incidence of the disease The occurrence of the disease and the climate, the soil is relatively large, especially the number of locusts in the fall and more active, more severe disease. Sowing period has a great impact on the incidence. The earlier the sowing, the heavier the disease. Third, the prevention and treatment methods to prevent disease at seedling stage to prevent aphid transmission of virus is the key to the prevention and treatment of this disease. (a) agricultural control. 1. Timely sowing. Due to the early planting, the temperature during the seedling stage is higher and the temperature is lower, which is suitable for the breeding of aphids. 2. Use early-maturing, high-yield disease-resistant varieties. 3. Timely removal of diseased plants reduces the chances of locust transmission. (b) Chemical control. 1. Thorough control of locusts. When the rapeseed grows true leaves, it starts spraying 40% of Dimethoate 3000 times, or 50% of Kangweiwei WP 2000~3000 times, killing the locusts, spraying once every 7 days or so, even spraying. 2 to 3 times. 2. Before transplanting, spray with dimethoate cream, or with dimethoate seedlings (above the ground) and then transplant to kill aphids and reduce disease.

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