以二龄菜粉蝶幼虫 (菜青虫 )作测试虫在室内用沾毒添饲感染的方法 ,分别测定了苏云金杆菌单剂、菜青虫颗粒体病毒单剂、苏云金杆菌和菜青虫颗粒体病毒混剂对菜青虫的毒力 ,其中致死剂量 L C50 分别为 2 6 .31× 10 -3 g/ L,7.13× 10 2 PIB/ m L,16 .2 5× 10 -3 g/ L.依苏云金杆菌与菜青虫颗粒病毒混剂对苏云金杆菌单剂的共毒系数为 16 1.91,表明了菜青虫颗体病毒对苏云金杆菌有增效作用 . The second instar cabbage butterfly larvae (Pieris rapae) as test insects in the laboratory with the method of feeding Tim infection, were measured single Bacillus thuringiensis, cabbage caterpillar fungal granulosis virus single, Bacillus thuringiensis and cabbage cv. Granulosis virus mixture To cabbage worm toxicity, the lethal dose of L C50 was 26.31 × 10 -3 g / L, 7.13 × 10 2 PIB / m L, 16.2 × 10 -3 g / L. According to Bacillus thuringiensis And Pieris rapae Granulosis virus mixture of Bacillus thuringiensis single agent co-toxicity coefficient of 16 1.91, showed that Pieris rapae virus has a synergistic effect on Bacillus thuringiensis.