小菜蛾(Plutella xylostella L.)是危害十字花科蔬菜的主要害虫之一,尤喜食甘蓝类蔬菜,以幼虫嚼食寄主叶片。在青岛一年发生5-6代,具多世代重叠现象。当幼虫注入菜心球内,不但取食菜心,而且由于腐烂和粪便污染菜心,严重影响蔬菜产量和品质。由于小菜蛾幼虫较活泼,稍有外界刺激就会从叶片上抽丝下垂。因此较难防治。长期大量使用化学农药对其进行防治,已使害虫产生了较强 Plutella xylostella L. is one of the major pests that endanger cruciferous vegetables, especially cabbage-type vegetables, with larvae chewing the host leaves. Occurred in Qingdao 5-6 generation a year, with multiple generations of overlapping phenomenon. When the larvae are infused into the heart of the vegetable, not only the vegetable heart but also the vegetable heart are contaminated by decay and excrement, seriously affecting the yield and quality of vegetables. Due to the more lively diamondback moth larvae, a slight external stimulus will sap the leaves. So difficult to control. Long-term large-scale use of chemical pesticides to prevent it, has resulted in a strong pest