The results appeared that 55 strains contain vip3A gene. Bioassay showed that the strains of Bt LS1 and LS8 have high toxicity toward Helicoverpa armigera and Spodoptera exigua.

• 对31株含有vip3A基因的Bt野生型菌株进行了生物活性测定,得到了营养期对棉铃虫活性较高的菌株LS1和LS8。