为了探索生物防治菜青虫的途径,我们曾进行了多点调查,在沈阳市五三公社万泉大队和南塔大队的大白菜地,发现菜青虫有自然罹病死亡的现象,随即将采集的标本送到中国科学院林土研究所,经电镜鉴定为杆状病毒属菜青虫颗粒体病毒所致.据两年调查,有的地块菜青虫自然感病(颗粒体病毒)死亡率高达80%,而且相互感染蔓延较快. In order to explore the biological control cabbage worm way, we conducted a multi-point investigation, in Shenyang City Commune Wanquan brigade and the South Tower brigade cabbage found that Pieris rapae has a natural death from the phenomenon, then the collected specimens Sent to the Institute of Forest Research, Chinese Academy of Sciences, identified by electron microscopy Bacillus subtilis virus due to cabbage .According to two years of investigation, some plots cabbage natural susceptibility (granulovirus) mortality as high as 80% And mutual infection spread rapidly.