韭菜根蛆是种蝇的幼虫,经常聚集在一起蛀食根和根茎,造成烂根。轻者虽能萌发,但长势弱,需1年后才能恢复,对温室、大棚、露地的韭菜生产危害很大。严重者全株死亡,缺苗断条。防治方法:用40％氧化乐果、或90％敌百虫800—1000倍液灌根毒杀幼虫,灌3次完全可以控制危害。第一次在5月中旬,第二次在割完第二刀韭菜之后,第三次在8 Leek root maggots are species of larvae of insects that often gather together to erode roots and roots, causing rotting roots. Although the light can germinate, but growing weak, need to be restored after 1 year, the greenhouse, sheds, exposed leek production of great harm. Severe death of the whole plant, lack of broken seedlings. Prevention and treatment methods: 40% omethoate, or 90% trichlorfon 800-1000 times the root irrigation poison larvae, irrigation 3 times can completely control the hazards. The first time in mid-May, the second time after cutting the second knife chives, the third at 8