The sassafras is harmful to the young parts of the plant, causing the leaves to become small and deformed, the leaves to brown, and the plants to be short, such as defoliation, falling flowers, and falling fruits. The whole leaf can be chlorotic, and the leaf edge curls to the back to form a lower buckle. When the fruit is damaged, the surface of the fruit handle and the bract is grayish-white to gray-brown, losing luster, and the wood is hardened and hardened. Brown or tan and oily.
Control measures:
1. Remove the weeds in the fields and the litter in the fields, level the land, and destroy the wintering places to eliminate the wintering insects.
2. It is found that the occurrence of this cockroach should be immediately carried out for the prevention and treatment of the medicament. It can be used with 15% ketone ketone 300 times liquid, 34% worm gram EC 2000-2500 times, 48% lesben 1000 times liquid, 1.8% worm.螨克, 1.8% avermectin (Qibu, Xinke, etc.) 3000 times solution, 15% 哒螨 乳 emulsifiable concentrate 1500 times solution, 73% gram emulsifiable concentrate 2000 times solution, 15% broom emulsifiable concentrate 2000 times solution 35% of the killing emulsifiable concentrate 1000 times liquid and other chemicals are used for prevention and treatment. When spraying, focus on spraying the young parts of the upper part of the plant. In order to produce pollution-free vegetables, dicofol can not be used to control aphids.
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