Niveles de resistencia a dos insecticidas en poblaciones de Aedes aegypti (Díptera: Culicidae) del Perú

Abstract

The purpose of this study was to determine resistance leveis to temephos and deltametrine in two natural populations of Aedes aegypti from Peru. Bioassays in larvae and adults were carried out following the methodology of the World Health Organization. The visualization of Besterase bands was made by poliacrylamide gel electrophoresis (PAQE) in fourth instar larvae. Natural populations from Sullana (Piura) and El Porvenir (La Libertad) presented resistance ratios to temephos of 1.67 X and 1.45 X, respectively, indicating susceptibility in both populations; for deltametrine the Sullana population presented resistance with a KDT50 of 106 min and 68% mortality at 24 h; in the El Porvenir population susceptibility was observed, with a KDTS0 of 36.9 min and 99% mortality. Esterase B., was identified with a Rf of 0.23 only in El Porvenir population. The insecticide temephos can continue being used in control programs of the Aedes aegypti vector because the species is still susceptible to this organophosphorate; on the contrary with deltametrine, where its effects should be evaluated in natural populations since some of them should be presenting resistance, as in the case of the Sullana population.