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蓟马是危害大葱的重要害虫之一,还可危害韭菜、大蒜、洋葱等,近几年在河南省大葱种植区危害严重,大葱被害率高达50％以上。受害大葱叶部形成许多细密连片的银白色条斑,叶尖干枯,严重时叶部失去膨压而下垂扭曲,变黄枯萎,影响光合作用,致使叶部不能食用,对大葱产量和品质影响极大。 危害大葱的蓟马主要有葱蓟马、烟蓟马和稻管蓟马等,它们常常混生,其危害盛期在5～9月份。蓟马体微小,呈浅黄色至深褐色。该虫在河南一年可发生多代,它
Thrips is one of the important pests that endanger the onions and can also endanger leeks, garlic, onions and so on. In recent years, the scallion plantation in Henan Province is seriously endangered. The rate of the green onions is as high as 50% or more. Injured onion leaves formed many fine contiguous silver-white streaks, withered leaf tip, leaf loss in the severe turgor and sagging when the leaves, yellowing and withering, affecting photosynthesis, resulting in leaves can not eat on the yield and quality of onion great. Harmful green onions Thrips mainly Thrips tabaci, Thrips tabaci and rice thrips, etc. They are often mixed, its damaging period in May to September. Thrips tiny, pale yellow to dark brown. The worm can occur in Henan for many generations a year, it