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In this work, bioassays were carried out in laboratory conditions (average temperature 26 +/- 2 degrees C) to test ten strains of Bacillus sphaericus, isolated from Brazilian soils against third instar larvae from anopheline species recorded as malaria vectors in Amazonian-Anopheles nuneztovari and An. darlingi. With the former mosquito, three strains--S2, S20 and S46 showed relative activity, in 24 and 48 hr exposure to the B. spahericus strains. With the latter only the S2 and S20 were effective in the 48 hr reading. The studied strains that showed the most adequate response in the Amazonian region were S2 and S20 showing broader and more efficient results. Therefore, S2 was the most effective when the 24 and 48 hr readings were considered, because it showed the greatest relative activity values.

Studies on the Bacillus sphaericus Larvicidal Activity against Malarial Vector Species in Amazonia