在蔬菜生产中，菜青虫是对蔬菜危害较严重的害虫。它取食植物叶片、花和果实，重者能把叶片吃光。同时被菜青虫咬食过的伤口，易被软腐病菌侵染，导致病害流行。所以，防治菜青虫很重要。而传统的防治方法主要是使用化学农药，使用化学农药的缺点是农药残留量大，影响人体健康 In vegetable production, Pieris rapae is a pest that harms vegetables. It feeds on plant leaves, flowers and fruits, and heavy ones can eat the leaves. At the same time by cabbage bites the wounds, easily infected with soft rot bacteria, leading to epidemics. Therefore, prevention cabbage is very important. The traditional method of prevention and control is mainly the use of chemical pesticides, the disadvantage of using chemical pesticides is pesticide residues, affecting human health