白僵菌是半知菌类丝菌目波氏菌属的一种虫生性真菌。寄生害虫的方式靠孢子接触体表,孢子发芽侵入虫体,菌丝靠虫体内营养大量繁殖而杀死害虫。孢子在8—32℃的条件下均能萌发,但最适生长发育的条件是:温度25—28℃,相对湿度90％以上。 在我国南方许多省(区),已大量推广用白僵菌防治马尾松毛虫。据福建、 Beauveria bassiana is a kind of entomogenous fungi that belongs to the genus Halobacterium spp. Parasitic pests approach by spore contact with the body surface, spores germination invade the worms, mycelium parasite nutrition and kill a large number of insect pests. Spores can germinate under the conditions of 8-32 ℃, but the optimum growth and development conditions are: temperature 25-28 ℃, relative humidity 90%. In many southern provinces (regions), we have promoted the use of Beauveria bassiana to control Plutella xylostella. According to Fujian,