1973年秋,我们从白僵菌自然寄生的黑尾叶蝉虫尸标本中,分离获得了白僵菌“洪52”菌株。几年来,经过数万亩的大面积示范试验,证明白僵菌“洪52”对水稻黑尾叶蝉防治效果显著。1977年经省级鉴定通过,决定予以推广。防治稻叶蝉的效果应用白僵菌“洪52”防治水稻黑尾叶蝉,施药后2天左右害虫食欲减退。田间虫口密度下降,在施后一星期达到高峰,第8—12天达到死虫高峰。虫口下降率一般为80—90%,最高达98%;寄生死亡率 In the autumn of 1973, we isolated the Beauveria bassiana “Hong 52” strain from the dead cicada parasitoid of Beauveria bassiana. Over the past few years, after tens of thousands of acres of large-scale demonstration test to prove Beauveria bassiana “Hong 52” on the rice leafhopper control effect was significant. In 1977 passed the provincial appraisal, decided to be promoted. Prevention and control of rice leafhopper effect Beauveria bassiana “Hong 52” control rice leafhopper, about 2 days after application pests decreased appetite. Decreased density of insect population in the field, peaked one week after application, and reached the peak of dead insects on days 8-12. Insect population decline rate is generally 80-90%, up to 98%; parasitic mortality