菜青虫菜青虫即(小)菜粉蝶。幼虫期啃吃莲花白、萝卜、油菜、白菜等叶肉、严重时,可将整株叶片吃光。若在莲花白尚未结球前受害,则影响包心。一旦菜青虫钻进叶球内,就在叶球内吃菜心,并排出黑色颗粒状粪便,严重影响莲花白的商品价值。过去我市对菜青虫的防治不是单用 Pieris brassicae Pieris (small) Pieris brassicae. Gap eating larvae lotus white, radish, rape, cabbage and other mesophyll, severe, the whole plant can be eaten leaves. If the lotus before the ball has not hit the ball, it affects the heart. Once Cabbage worm into the leaves of the ball, eat cabbage in the leaf ball and excretion of black granular feces, seriously affecting the lotus white commodity value. In the past, prevention and treatment of Pieris in our city is not alone