Evaluation of Different Larvicides for the Control of Aedes aegypti (Linnaeus) (Diptera: Culicidae) under Simulated Field Conditions.

Abstract

Dengue is an arbovirosis, transmitted by Aedes aegypti (Linnaeus) (Diptera: Culicidae). In Brazil the larval control of this mosquito has utilized the organophosphate temephos, which has selected resistant mosquito populations. Faced with this problem, the Ministry of Health is searching for new products including those based on Bacillus thuringiensis israelensis (Bti). The aim of this work was to compare the efficacy and persistence of two bioinsecticides based on Bti (VectoBac WDG and VectoBac DT), one growth regulator – pyriproxyfen (Sumilarv 0.5 G), and a chemical product – temephos (Fersol 1G) in susceptible and temephos resistant populations of A aegypti. The results showed that the Bti products gave 100% population control for 20 days and there was no difference in susceptibility among the two mosquito populations. The products based on temephos and pyriproxyfen caused 100% larval mortality in both populations for 60 days after treatment.