关键词: 球形芽孢杆菌C_3－41, 毒性, 嗜人按蚊, 东乡伊蚊

Abstract: This paper reported the toxicity of Bacillus sphaericus_c3-41 against the fourth instar larvae of Anopheles anthropophagus and Aedes togoi by bioassays in the laboratory. The LC₅₀ of Bs_c3-41 solution against An.anthropophagus after treatment for 24 hrs and 48 hrs were 2.40 ppm and 1.78ppm respectively.The LC₅₀ against Ae.togoi after treatment for 24 hrs and 48 hrs were 5.35ppm and 3.14 ppm.The residual effect of these treatments lasted for 1-2 weeks. The LC₅₀ of Bs C_3-41 powder against An.anthropophagus and Ae.togoi were 3.33ppm and 4.44ppm respectively after treatment for 24 hrs and 1.36ppm and 1.44ppm respectively after treatment for 48 hrs. The results showed that the larvicidal effectiveness of Bs C_3-41 against mosquito larvae after treatments for 48 hrs was much better than that for 24 hrs.