Culex quinquefasciatus (Diptera: Culicidae): avaliação da susceptibilidade aos inseticidas Temephos,, Vectolex WG e Natular

Abstract

In this study tests were performed to evaluate the susceptibility of Cx quinquefasciatus and Cx sp. Temephos to insecticides, Vectolex WG and NatularTM 20EC in two populations in the city of Naviraí - MS, for resistance monitoring of two populations of this species, after 24 hours of exposure to larvicides. The first larval population was collected in the cassava industry in Vila Nova and the second sample was collected in septic tanks Varjão neighborhood. The larvae collected in the field were taken to the laboratory at 27 °C, fed and separated according to the stage where they were. For larvae of Culex sp. collected in the undertaking, the evaluations have shown susceptibility to insecticides and Temephos Vectolex WG. Biological assays performed with larvae of Cx. quinquefasciatus products Temephos, Vectolex WG and NatularTM 20EC showed that this population is resistant to organophosphate Temephos when compared to the concentrations indicated for diagnosis and Sucen by WHO showed 97% mortality at a concentration of 0.016 diagnosis ppm active ingredient and susceptible to biolarvicides Vectolex and Natular, causing high mortality location, demonstrating the feasibility of using these products in Naviraí - MS. Studies have been conducted with the population of the districts Vila Nova and Varjão information leaflets with guidance on habits and breeding cycle of mosquitoes and actions that can prevent the proliferation of Culex quinquefasciatus.