菜粉蝶(Pieris rapae L.)幼虫俗称菜青虫。是世界性的十字花科蔬菜的第一号害虫。幼虫取食叶片,重者全叶吃尽,仅留叶柄,严重影响蔬菜的质量和生产。其寄生植物有9科35种之多。每年发生代数因地而异,在武汉市郊一年发生9代,幼虫期为5令,3令以后食量最大,危害猖獗(图1)。1978年5月我们在洪山公社附近苞菜地里发现莱青虫自然罹病死亡甚多。经采集,分离鉴定其病原体是一种颗粒体病毒(GV)。此病毒在国外研究甚多,范围亦广。在国内报导中仅涉及到分离和电镜观察。本文着重报导菜粉蝶颗 Pieris rapae L. larva commonly known as Pieris rapae. It is the number one pest of the world’s cruciferous vegetables. Larvae feeding on leaves, severe whole-leaf eaten, leaving only petiole, seriously affecting the quality of vegetables and production. Its parasitic plants have as many as 35 families and 35 species. The annual occurrence of algebra varies from place to place. In the suburbs of Wuhan, 9 generations occur each year. The larval period is 5 orders. After 3 orders, the appetite is the largest and the harm is rampant (Figure 1). In May 1978, we found that larvae died of natural disease and death in the basilicum near Hongshan commune. After collection, isolation and identification of the pathogen is a granulovirus (GV). This virus has many studies in foreign countries, its scope is also wide. In the domestic coverage only involves the separation and electron microscopy. This article focuses on cabbage butterfly