Abstract

MARTIRADONNA OCHIPINTI, Gianna et al. Effect of the growth regulator pyriproxyfen on Aedes aegypti (Linnaeus, 1762) (Diptera: Culicidae) from La Pedrera, Maracay, Aragua, Venezuela. Bol Mal Salud Amb [online]. 2014, vol.54, n.2, pp.208-219. ISSN 1690-4648.

Pyriproxyfen is a synthetic juvenile hormone analogue widely used in mosquito control. Bioassays were undertaken to evaluate the efficacy and residual activity of a granular formulation of pyriproxyfen (Sumilarv G- 0.5% in granules) against IV instar Aedes aegypti (La Pedrera and Rockefeller reference strains), at doses of 0.01; 0.02; 0.03; 0.04 and 0.05 ppm. Larvae were examined 1, 7, 15, 30, 45, 60, 75 and 90 days after treatment. The treated specimens showed malformations affecting their development, and higher mortality rates compared to the controls. The percentage mortality of larvae, pupae and adults and the percentage of adult emergence inhibition were calculated. Mortality rates (% M) were 76.83 % (Rockefeller strain) and 65.37 % (La Pedrera strain). The percentage of adult emergence inhibition was significantly higher (91.80 %) in the Rockefeller strain than the La Pedrera strain (78.08 %). Pyriproxyfen produced effective inhibition of adult emergence at all the doses evaluated, but with less residual effect at 0.01 ppm. Doses of 0.04 and 0.05 ppm were the most efficient and persistent over the 90 days of the experiment. The results suggest that pyriproxyfen could be used as an alternative in Aedes aegypti control strategies and integrated mosquito vector management programs in Venezuela.

Keywords : Aedes aegypti; biochemical control; Chikungunya; Dengue; emergence inhibition; insect growth regulators; juvenile hormone analogues; larvae; mosquitoes; pyriproxyfen; vectors.

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