苏芸金杆菌生态学研究的材料不多,关于苏芸金杆菌芽孢在自然条件下的数量变化仅有过少量的报道。Pinnock,D.E.等和Hostetter,D.L.等研究过几种苏芸菌制剂的芽孢在几种树叶上的数量变化,关岛安隆等和秋葉芳男等分别测定了苏芸金杆菌芽孢在桑园土中和灭菌土壤中的数量消长。我们在1978年,测定 There are not many materials for the research of Bacillus thuringiensis. Only a few reports on the changes of Bacillus thuringiensis spores under natural conditions. Pinnock, DE et al. And Hostetter, DL et al. Studied the changes of the number of spores of several species of Surae gene on several leaves. Anlu et al. And Akiba et al. Measured the accumulation of Bacillus thuringiensis spores in mulberry soil The amount of bacteria in the soil has been declining. We measured in 1978