“424”细菌杀虫剂系苏云金杆菌,其药效是利用菌体产生之芽孢品体、外毒素及卵磷脂酶等致病物质,在虫体进食后引起肠道病、败血症及全体瘫痪而死亡。特别是鳞翅目幼虫最易感染,如松毛虫、茶毛虫、玉米螟、稻苞虫、稻纵卷叶虫、菜青虫、刺蛾、避债蛾、苜蓿虫、烟青虫,栎褐天蛾、棉铃虫等等。经外省和本地施用证明,“424”对防治农业、林业、牧草及卫生害虫都有一定效果,田间防治效果尤为显著。 “424” Bacterial insecticide Bacillus thuringiensis, its efficacy is the use of bacterial cells produced spores, exotoxin and lecithin and other pathogenic substances in the parasites cause gastrointestinal disease, sepsis and paralysis and death. In particular, Lepidoptera larvae most susceptible to infection, such as pine caterpillars, tea caterpillars, corn borer, rice insects, rice leaf roller worms, Pieris rapae, sting moth, shelter moth, alfalfa pests, tobacco budworm, , Cotton bollworm and so on. As proved by other provinces and local governments, “424” has certain effect on prevention and control of agriculture, forestry, forage and pest of health, and the effect of field control is particularly remarkable.