菜蛾Plutellaxylostella（Linnaeus）属鳞翅目菜蛾科，是小白菜、大白菜、甘蓝、花椰菜等十字花科蔬菜常见的抗性害虫之一。该虫发生世代多，取食范围广，危害时间长，且抗性较强。菜蛾为害特点以幼虫取食叶片，初孵幼虫可钻入叶片组织内，取食叶肉；２龄后啃食叶片留下一层表 Plutella xylostella (Linnaeus) belongs to the family Lepidoptera, and is one of the common resistant pests to cruciferous vegetables such as cabbage, Chinese cabbage, cabbage and cauliflower. Occurrence of more than a generation of the worm, feeding a wide range of hazards a long time, and strong resistance. The damage characteristics of the diamondback moth larvae feeding leaves, the newly hatched larvae can be drilled into the leaf tissue, feeding on the leaf blade; after 2 years of eating the leaves leaving a layer of table