从棉田中自然死亡的棉铃虫体上分离得到一株昆虫致病菌,经鉴定为肠杆菌科沙雷氏菌属粘质沙雷氏菌(Serratiam arcescens)。实验证明该菌对烟青虫(H eliothis assulta)、菜青虫(Pieris rapae)、棉铃虫(H elicoverpa arm igera)、小菜蛾(Plutellaxylostella)等蔬菜上常见的鳞翅目害虫具有一定的毒力作用。该昆虫致病菌对目标昆虫的毒力主要表现在造成昆虫停食、行动迟缓、对刺激反应迟钝、幼虫生长期缩短、提前化蛹、不能正常羽化等方面。 An insect pathogen was isolated from the naturally dead cotton bollworm in cotton field and was identified as Enterobacter cloacae Serratiam arcescens. Experiments show that the fungus has certain virulence to lepidopteran pests such as Heliothis assulta, Pieris rapae, H elicoverpa arm igera and Plutella xylostella. The virulence of the insect pathogen on the target insect is mainly caused by insects stop eating, slow action, unresponsive to stimuli, shortened growth period of larvae, early pupae, can not be normal emergence and so on.