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The susceptibility of Aedes albopictus larvae, originating from “Vale do Ribeira Ilha Cumprida” São Paulo, Brasil, was determined under laboratory conditions. The product used was Bacillus thuringiensis var israelensis H-14 Vectobac–AS with 1,200 international toxic units (TU) per milligram. An Aedes aegypti Rockefeller colony from CDC (Center for Disease Control) of Puerto Rico was used as a reference. Lethal concentrations determined for Ae. albopictus were LC50= 0.12 ppm and LC90= 0.28 ppm and for the reference species Ae. aegypti they were LC50 0.07 ppm and LC95  0.17 ppm. It is concluded that Ae. albopictus presented a different response to the bioinsecticide than Ae. aegypti.

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