Susceptibility of Sylvatic Triatoma infestans From Andeans Valleys of Bolivia to Deltamethrin and Fipronil

ROCA ACEVEDO G; G MOUGABURE CUETO; M GERMANO; P SANTO ORIHUELA; M ROJAS CORTEZ; F NOIREAU; M I PICOLLO; C VASSENA

JOURNAL OF MEDICAL ENTOMOLOGY

ENTOMOLOGICAL SOC AMER

Lugar: Lanham; Año: 2011 vol. 4 p. 828 - 835

0022-2585

ABSTRACT We describe the susceptibility to deltamethrin and Þpronil of four sylvatic Triatoma infestans populations from the Andean valleys of Bolivia. Fifty percent lethal doses were determined from topical application of insecticide on Þrst instars, and mortality was assessed after 24 h for deltamethrin and 48 h for Þpronil. In comparison with a reference strain from Argentina, the Bolivian populations showed deltamethrin 50 percent lethal dose ratios ranging from 1.9 to 17.4. In the case of Þpronil, aninsecticideneverusedfor control of T. infestans, the Bolivian populations showed even higher variation in toxic response, with relative susceptibilities ranging from 0.5 to 139.2. However, although the sylvatic T. infestans toxicological proÞles differ from each other and from those of thedomiciliary population studied in this work, there were no signiÞcant differences in the activities of P450 mono-oxygenases andpyrethroid esterases between the reference strain and the studied populations