Active dispersal of Triatoma infestans and other triatomines in the Argentinean arid Chaco before and after vector control interventions

Abstract

Peridomestic structures are considered the main sites where Triatoma infestans (Hemiptera: Reduviidae) remain and disperse, representing the first risk factor for intradomestic invasion, even after vector control activities. This study analyzed T. infestans dispersal during vector control interventions in six rural houses of the arid Chaco (La Rioja, Argentina). Flying and walking dispersers were captured during five months of two consecutive warm seasons after insecticide spraying of intra-and peridomiciles. These data were compared with previous published data in the same scenario but without insecticide spraying in peridomiciles. Recorded climatic conditions were favorable for active dispersion during the study. Total number of T. infestans dispersers moving among domestic habitats decreased after insecticide spraying. Sylvatic triatomines T. guasayana, T. eratyrusiformis, T. garciabesi, and T. platensis, not targeted by insecticide spraying, were captured simultaneously within peridomestic areas and showed higher invasion pressure than T. infestans. Adult T. infestans peridomestic populations showed high nutritional status, indicating low dispersion probability. Some peridomiciles remained infested at the end of the study. However, no intradomiciles were recolonized. These results suggest that there is a low probability of intradomestic recolonization by active dispersion from peridomiciles during 15 months post-spraying. Journal of Vector Ecology 41 (1): 90-96. 2016.

Morphometric variability among the species of the Sordida subcomplex (Hemiptera: Reduviidae: Triatominae): evidence for differentiation across the distribution range of Triatoma sordida

“…It is rare in human habitats and is commonly associated with bird nests in wild environments. However, it has been collected from peridomestic structures like chicken coops [ 8 , 9 ]. Triatoma guasayana is found in Argentina, Bolivia and Paraguay (Figs.…”

“…Triatoma guasayana is found in Argentina, Bolivia and Paraguay (Figs. 1c and 2a ); it is sylvatic and invades houses temporally [ 8 , 10 ]. Triatoma patagonica is endemic to Argentina; it is mainly sylvatic but has also been found colonizing domiciles and peridomiciliary structures in several Argentine provinces (Figs.…”

The eco-epidemiology of Triatoma infestans in the temperate Monte Desert ecoregion of mid-western Argentina

“…The use of electricity and proximity to wild habitats may favour the invasion of triatomines from wild or peridomestic foci into domiciles, especially among houses that lack window screens ( Waleckx et al 2015 ). Active dispersal of nymphs and adults of T. infestans and other triatomines were reported in different areas of Argentina ( Abrahan et al 2016 ).…”

Impact Involving the Community in Entomological Surveillance of the Triatoma Infestans Vectorial Control

“…To verify the climatic conditions in the study area and based on equipment availability, three data loggers (HOBO U10 / 003 Onset Computer Corporation, Bourne, MA, USA), each of them were placed in Pinchas, Anillaco and Santa Vera Cruz localities. Temperature (°C) and relative humidity (%) were recorded at 15minute intervals between 7:00 p.m. and 10:30 p.m., corresponding to the moment of the peak active dispersion for T. infestans [14,15,16].…”