【摘要】 球形芽孢杆菌Ｃ３┐４１杀蚊幼实验制剂对３～４龄致倦库蚊和大劣按蚊幼虫有较强的毒性，其４８小时的ＬＣ５０值分别为０．００７９５和０．９８５００ｍｇ／Ｌ。蚊幼虫死亡后，球形芽孢杆菌芽孢能在死蚊幼体内正常萌发、繁殖和发育，并产生有杀蚊活性的芽孢和晶体混合物。在含有死蚊幼虫的处理组，两种蚊幼虫的死亡率２０天内一直维持在９５％以上；在无死蚊幼的对照组，大劣按蚊幼虫１４天后的死亡率下降为０，致倦库蚊幼虫２０天后的死亡率下降到１０％以下。证明经球形芽孢杆菌处理致死的蚊幼尸体可以延长制剂在水体中的持效期更多还原

【Abstract】 acillus sphaericus C3 41 formulation had high toxicity against Culex quinquefasciatus and Anopheles dirus larvae and the LC 5 0 values at 48 h were 0 00795 and 0 98600 mg/L respectively In the larvae cadaver, B sphaericus spores germinated, developed normally and produced recycling spores and crystal complex with high activity Laboratory experiments proved that the cadavers played an important role in the long persistence of B sphaericus in water When mosquito cadavers were added into the water the mortality of the larvae remained over 95% during the 20 d experimental period While in the water without cadaver the mortality of A dirus and C quinquefasciatus decreased rapidly from nearly 100% on the second day to zero at the end of the experiment更多还原