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Toxicological, Enzymatic, and Molecular Assessment of the Insecticide Susceptibility Profile of Triatoma infestans (Hemiptera: Reduviidae, Triatominae) Populations From Rural Communities of Santa Cruz, Bolivia
A wide range of insecticide resistance profiles has been reported across Bolivian domestic and sylvatic populations of Triatoma infestans (Klug, 1834) (Hemiptera, Reduviidae), including some with levels proven to be a threat for vector control. In this work, the insecticide profile of domestic T. infestans was studied with standardized toxicological bioassays, in an area that has not undergone consistent vector control. F1 first-instar nymphs hatched in laboratory from bugs captured in three communities from the Santa Cruz Department were evaluated with different insecticides. Moreover, the enzymatic activity of esterases ...
Source: Journal of Medical Entomology - January 11, 2017 Category: Biology Authors: Santo-Orihuela, P. L., Vassena, C. V., Carvajal, G., Clark, E., Menacho, S., Bozo, R., Gilman, R. H., Bern, C., Marcet, P. L. Tags: Vector Control, Pest Management, Resistance, Repellents Source Type: research

Revalidation of Nyssomyia fraihai (Martins, Falcao & Silva 1979) (Diptera: Psychodidae)
In this study, the morphometric/morphologic characters of specimens that had been identified as Ny. yuilli yuilli from different localities (Brazil, Peru, Colombia, Bolivia) and type material of both Ny. yuilli yuilli and Lu. fraihai were analyzed. The results revealed that males from Brazil (Bahia, Acre, Pará, and Rondônia states) and Peru present statistically significant differences in the ratio between paramere rectangular and digitiform areas as well as for the cercus length and width of the aedeagal ducts tips, when compared with the type specimens of Ny. yuilli yuilli, but are statistically similar to t...
Source: Journal of Medical Entomology - November 11, 2016 Category: Biology Authors: Godoy, R. E., Galati, E. A. B. Tags: Morphology, Systematics, Evolution Source Type: research

Examining Mechanisms of Pyrethroid Resistance in Eggs of Two Populations of the Chagas' Disease Vector Triatoma infestans (Hemiptera: Reduviidae)
In this study, we explore the biochemical and molecular mechanisms potentially associated with the deltamethrin resistance assessed in the developing eggs of the Argentinean (Campo Largo) and Bolivian (Entre Ríos) T. infestans populations. We found measurable activity of monooxigenases and pyrethroid esterases throughout embryonic development. The pyrethroid esterase activity grew steadily throughout development in all the studied populations and was highest in eggs 12 d old. Mean enzyme activity increased from 13.6 to 16.3 and 22.2 picomol 7-hydroxycoumarin/min (7-OHC) in eggs of 4-, 7-, and 12 d old from the susce...
Source: Journal of Medical Entomology - September 11, 2015 Category: Biology Authors: Roca-Acevedo, G., Picollo, M. I., Capriotti, N., Sierra, I., Santo-Orihuela, P. L. Tags: Vector Control, Pest Management, Resistance, Repellents Source Type: research