苏云金杆菌,简称Bt,是一类可产生芽孢的革兰氏阳性细菌,被广泛用于农业,特别是有机农业以及转基因农业,可用于防治直翅目、鞘翅目、双翅目、膜翅目,特别是鳞翅目的多种害虫。Bt广泛分布于世界各地的土壤、尘埃中,无论在海滩、沙漠还是冻土带,均有它们的活动踪迹。当周围环境中的营养物质缺乏的时候,营养期的Bt就开始形成芽孢,并在体内形成伴孢晶体。这种 Bacillus thuringiensis, referred to as Bt, is a type of Gram-positive bacterium that produces spores and is widely used in agriculture, especially in organic agriculture and in transgenic agriculture. It can be used for controlling Orthoptera, Coleoptera, Diptera, Hymenoptera , Especially Lepidoptera a variety of pests. Bt is widely distributed in soils and dust around the world and has traces of its activities in beaches, deserts and tundra. When nutrients in the environment are scarce, Bt during the vegetative phase begins to form spores and form crystals in the body. This