细菌不仅给人类、牲畜和农作物带来病害,也侵染昆虫,使其生病以致死亡。早在本世纪初期,科学家就开始研究利用某些细菌来防治农林害虫。其中研究最多的是苏芸金杆菌(Bacillus thuringiensis)——一种产芽孢的革兰氏阳性细菌。在这种杆菌形成芽孢的同时,也产生一 Bacteria not only cause diseases to humans, livestock and crops, but also insects, making them sick and dying. As early as the beginning of this century, scientists began to study the use of certain bacteria to control agroforestry pests. One of the most studied is Bacillus thuringiensis - a spore-producing Gram-positive bacterium. In this Bacillus spore formation at the same time, also produce one