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

GONZALO ROCA ACEVEDO; GASTON MOUGABURE CUETO; MONICA GERMANO; PABLO SANTO ORIHUELA; MIRKO ROJAS CORTEZ; FRANÇOIS NOIREAU; MARIA INES PICOLLO; CLAUDIA VASSENA

JOURNAL OF MEDICAL ENTOMOLOGY

ENTOMOLOGICAL SOC AMER

Lugar: Maryland; Año: 2011 vol. 48 p. 828 - 835

0022-2585

We describe the susceptibility to deltamethrin and fipronil of four sylvatic Triatoma infestans populations from the Andean valleys of Bolivia. Fifty percent lethal doses were determined from topical application of insecticide on first instars, and mortality was assessed after 24 h for deltamethrin and 48 h for fipronil. 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 fipronil, aninsecticideneverusedfor control of T. infestans, the Bolivian populationsshowedevenhigher variation in toxic response, with relative susceptibilities ranging from 0.5 to 139.2. However, although the sylvatic T. infestans toxicological profiles differ from each other and from those of the domiciliary population studied in this work, there were no significant differences in the activities of P450 mono-oxygenases and pyrethroid esterases between the reference strain and the studied populations.