New findings of insecticide resistance in Triatoma infestans (Heteroptera: Reduviidae) from the Gran Chaco

49. M.D. GERMANO, G. ROCA ACEVEDO, G.A. MOUGABURE CUETO, A. TOLOZA, C.V. VASSENA AND M.I. PICOLLO

JOURNAL OF MEDICAL ENTOMOLOGY

ENTOMOLOGICAL SOC AMER

Año: 2010 vol. 47 p. 1077 - 1081

0022-2585

Chagas disease is a major health concern in Latin America, and Triatoma infestans (Klug,1834) is responsible for the majority of cases of Chagas disease in the continent. After the discoveryof deltamethrin highly resistant populations in the neighboring areas to Yacuiba (Bolivia) and SalvadorMazza (Argentina), we studied T. infestans populations north and southward, with the aim ofdescribing the range of the resistant area. In addition, tests were conducted to describe the susceptibilityto Þpronil in deltamethrin-resistant populations. Tarija populations were highly resistant todeltamethrin, showing that the resistant area is greater than previously reported. Argentinean andParaguayan populations were susceptible or presented moderate to low levels of deltamethrinresistance. Resistance to Þpronil was found in Bolivian populations, although this insecticide waseffective against Argentinean populations. This study shows that the Argentinean and Paraguayanpopulations are currently under successful control with deltamethrin. However, continuous resistancemonitoring is necessary.Wefound that Þpronil is a viable option for Argentina, whereas the resistancefound in Bolivia implies that new formulations are needed to control T. infestans in Bolivia. Furtherresearch is required to Þnd new alternatives of control in those areas that are currently suffering fromhigh infestation rates