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BT又名HD—1,是一种苏云金杆菌变种的制剂。是防治软体害虫的一种新型微生物农药。1981年从国外引进,全国已推广70余万亩,喷药后48小时内预治效果都在80％以上。它毒杀害虫的有效成分主要是伴胞晶体蛋白和芽胞毒素,其毒杀对象是鳞翅目、膜翅目、双翅目和鞘翅目害虫。当这些幼虫食入药物后,晶体蛋白质在中肠分解成两条多肽单链,其中一条肽链有毒,从而引起害虫肠道中毒,停止进食;芽胞毒素进入害虫体腔后则在虫体
BT, also known as HD-1, is a preparation of a Bacillus thuringiensis variant. It is a new type of microbial pesticide for controlling insect pests. Introduced from abroad in 1981, the country has promoted more than 70 acres, 48 hours after spraying pre-treatment effect in more than 80%. Its poisonous insecticide is the main active ingredient associated with crystal proteins and cytokines, its target of poisoning Lepidoptera, Hymenoptera, Diptera and Coleoptera pests. When these larvae ingested drugs, the crystal protein in the midgut breaks down into two polypeptide single chain, one of the peptide chain is toxic, causing pest intestine poisoning, stop eating; Cytoxins into the pest body cavity in the parasites