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菜青虫(Artogeia rapae)是菘蓝(Isatis indigoti-ca Frot.)的主要害虫,初孵幼虫先吃去卵壳,然后在叶背取食叶肉,形成黄白色小点,以后食量逐渐增大,将叶片吃成孔洞或缺刻,甚至吃尽全叶。生产上以喷洒化学药剂防治为主,也有人施用BT乳剂800～1000倍溶液防治。BT乳剂系微生物农药,不污染环境,不毒害人畜,不易使害虫产生抗药性,且对天敌无害。据本人试验和在生产上示范,用喷洒BT乳剂而死亡的菜青虫搓洗液,再次防治菜青虫,效果很好。
Artogeia rapae is the major pest of Isatis indigoti-ca Frot. The newly hatched larvae first eat the egg shell, and then eat the mesophyll on the leaf back to form yellow-white dots. After that, the food intake gradually increases, Eaten leaves into holes or nicks, and even eat the whole leaf. Spraying chemical production control mainly spray, but also the application of BT emulsion 800 to 1000 times the solution control. BT emulsion microbial pesticides, do not pollute the environment, do not poison people and livestock, not easy to produce pest resistance, and harmless to natural enemies. According to my test and production demonstration, with the spray BT emulsion died cabbage worm scrub, once again control cabbage worm, the effect is very good.