Avalia o da toxicidade de estirpes de Bacillus thuringiensis para Aedes aegypti Linneus, (Díptera: Culicidae)

This work was aimed at to select and to identify strain of Bacillus thuringiensis (Bt) obtained of samples of soil inthe state of Tocantins that presented toxicity for the mosquito Aedes aegypti. It was obtained isolated of Bt of thesamples of obtained soils and with larger number of colonies in soils with high clay tenor and organic matter. Thepoisonous activity among the isolated ones obtained it varied by 14.7 to 98% of mortality to larvas of 2o stadium ofA. aegypti, with prominence for the isolated TO-392. They were accomplished analyzes for SDS-PAGE where therewas the presence of a peptides of approximately 80 kDa, wasn′t visualized us too much isolated, the ancestry A-392had 98% of mortality about larvas of A. aegypt was tested i, in the period of 48 hours, using a concentration of 1and 2 % of the bacterial .broth. It is verified that B. Thuringiensis isolated of the state of Tocantins presentspromising results for they can be used in the production of a bioinseticide against the larvas of this mosquito.