菜青虫是菜粉蝶的幼虫,是甘蓝生长季节的主要害虫。它为害甘蓝茎叶,引起缺刻、孔洞,并排粪便于植株上,造成产量、质量、经济效益下降,严重时成毁灭性为害。多年来普遍采用农药防治,但存在很大缺点:一是残效期长,对人畜有毒。二是污染环境,杀死大量天敌。三是产生抗药性,防治效果降低。菜青虫颗粒体病毒防治菜青虫,克服了以上缺点,且用菜青虫颗粒体病毒防治菜青虫后,可拾虫尸,或人工培养虫尸,再进行施用,是 Pieris rapae is a larva of the cabbage butterfly and is a major pest of the cabbage growing season. It is to fight the stems and leaves of cabbage, causing nicks, holes, and defecate on the plants, resulting in yield, quality, economic decline, serious into devastating damage. Over the years the widespread use of pesticide control, but there are major shortcomings: First, the residual effect period is long, toxic to humans and animals. Second, pollute the environment, kill a large number of natural enemies. Third, the emergence of drug resistance, prevention and control to reduce. Pieris rapae granulosis virus control Pieris rapae, to overcome the above shortcomings, and Pieris rapae granulosis virus control Pieris rapae, the fossa can be carcasses, or artificial cultivation of worms, and then applied, is