一为害情况根据本年调查,种蝇是影响韭菜生产的重要害虫,老乡们叫“韭菜蛆”的,就是它的幼虫。由于种蝇为害,常使韭叶死亡,—般的为害率20—30%,个别的可达75%以上,但这样的为害率,并不能说明它的严重性,因为韭菜是多年生植物,播种头2—3年,是培养根株时期,成本多,收获少,到了3年后,正是收获量最高时期,一遇韭蛆,前功尽弃;而且被 A damage situation According to the survey this year, the species of flies are important pests affect the production of chives, fellow called “leek maggots ” is its larvae. Because of the flies damage, leek leaves often death, the general damage rate of 20-30%, individual up to 75% or more, but this damage rate does not explain its seriousness, because leeks are perennials, sowing The first 2-3 years, is to cultivate the root system period, the cost more, less harvest, to 3 years later, it is the highest harvest period, a case of leek maggots, come to naught; and was