Efficacy and persistence of two Bacillus thuringiensis israelensis formulations for the control of Aedes aegypti (Linnaeus, 1762) under simulated field conditions

Authors: Zequi J.A.C, Lopes J, Santos F.P, Vilas-Bôas G.T.

The objective of this work was to evaluate the efficacy and persistence of Bacillus thuringiensis israelensis, when used against immatures of Ae. aegypti and to monitor water quality with respect to pH, conductivity (mS), dissolved (mg/L) and saturated (%) oxygen. The microbial behavior and persistence of bacteria were determined. The experiment was carried out in an unshaded area, utilizing five barrels with 80 liters of water for each product together with 50 immatures. Vectobac T at 0.9x10-3 g/L produced 100% mortality of larvae up to the eighth day and 98.8% up to the fifteenth day. Vectobac WDG, at 2.4x10-4 g/L, controlled 100% of immatures up to the first 15 days. Conductivity and pH increased gradually with time in the experiment. Oxygen concentration was always about 7 mg/L. Vectobac WDG disperses rapidly in the environment, while Vectobac T is slowly released, with significant reduction in Bti during 22 days.

 

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