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１引言苏云金芽孢杆菌（ＢａｃｉｌｌｕｓｔｈｕｒｉｎｇｉｅｎｓｉｓＢｅｒｌｉｎｄｅｒ）简称Ｂ．ｔ．，是目前世界上应用最广、生产最多的微生物杀虫剂。它有很多优点，如分布广，菌种资源十分丰富；容易培养，既易于实验室研究，又易于工业化生产；它有很广的杀虫谱，除
1 Introduction Bacillus thuringiensis (BacillusthuringiensisBerlin-der) referred to as B. t. , Is currently the most widely used and most widely produced microbial pesticide in the world. It has many advantages, such as wide distribution, rich species resources; easy to cultivate, not only easy to laboratory research, but also easy to industrialized production; it has a very broad insecticidal spectrum, in addition to