Effectiveness of Bacillus sphaericus on Anopheles nuneztovari (Diptera: Culicidae) in Amazonia

Abstract

Under laboratory conditions, bioassays were carried out in order to test the effectiveness of eight Bacillus sphaericus Neide strains isolated from Brazilian soils, against larvae of Anopheles nuneztovari, a potential malaria vector in Amazonia. The findings from this study showed a greater effectiveness of the S14 (CL50 0.07 ppm), S58 (LC50 0.10 ppm), S42 (0.11ppm) and S12 (LC50 0.24 ppm) strains, after being in contact with the larvae for 48h. Compared with the 2362 B. sphaericus standard strain (LC50 0.47 ppm), the four strains showed relative potency (around 2-6 times higher), and are therefore a promising control for Anopheles species in Amazonia.