根蛆是危害大白菜的主要害虫。大白菜在生长过程中,一旦发生根蛆危害,不仅严重降低产房,减少经济收入,而且还影响大白菜的实用价值。危害大白菜的根蛆是萝卜蝇的幼虫。种蝇的卵产在菜帮基部的背面,经2～3天孵化成小蛆,然后钻入土中咬食根部的表皮,菜根被咬伤后,病菌趁机而入,引起掉帮腐烂,并易诱发白菜软腐病。 防治大白菜根蛆的综合措施如下: The root maggot is the major pest that endangers Chinese cabbage. Chinese cabbage in the growth process, once the occurrence of root maggot hazards, not only seriously reduce the delivery room, reduce economic income, but also affect the practical value of Chinese cabbage. The root maggot that endangers Chinese cabbage is the larva of the radish fly. The eggs of the flies fly on the back of the baskets. After 2 to 3 days, they hatch into small maggots, and then drill into the earth to bite the epidermis of the root. After the root is bitten, the germs take the opportunity to enter and cause the decay and easy Induced cabbage soft rot. Prevention and treatment of Chinese cabbage root maggot comprehensive measures are as follows: