小菜蛾又称菜蛾、小青虫 ,俗称“两头尖”主要危害甘蓝、花椰菜、白菜、萝卜等十字花科蔬菜。近年来 ,由于寄生作物的周年连作 ,加之防治时使用药剂不当 ,导致了小菜蛾的抗药性急剧上升。小菜蛾幼虫在蔬菜苗期 ,多集中在心叶为害 ,同时也在叶背取食叶肉和为害种株的嫩茎、幼荚 Plutella xylostella, also known as Plutella xylostella, small green worm, commonly known as “two sharp” main endanger cabbage, broccoli, cabbage, radish and other cruciferous vegetables. In recent years, due to the annual breeding of parasitic crops, coupled with improper use of pesticides when control led to a sharp increase in resistance to diamondback moths. Plutella xylostella larvae in vegetables at the seedling stage, and more concentrated in the heart-leaf damage, but also in the leaves back to eat leaves and the injured plant stems, young pods