CONICET | Buscador de Institutos y Recursos Humanos

In the scope of the prevention programes for dengue, it is important the elimination of possible breading places of Ae. aegypti larvae. In this study, the larvicidal effect of IGRs such as diflubenzuron and pyriproxyfen on larvae III/ IV of the susceptible strain CIPEIN of Ae aegypti was determined, obtaining values of LC50 of 1.84 and 0.063 ppb respectively. Experimental slow release granular formulations 0.1% of both larvicides showed 100 % larvae mortality at a concentration of 1 and 0.04 ppm respectively. A residual efficacy assay was performed using 1.5 g granules 0.1% a.i. in 15 lt water (1 ppm). Weekly the larvicidal effect was determined on larvae III/IV. Novaluron 10% EC (OSCAR), pyriproxyfen 0.5% granular (SUMILARV) and Temefos 1% sand granules (ABATE) were used as possitive controls. It was found that the experimental formulation has a residual activity over 3 months. An EC 10 1 % formulation of cis-permethrin plus pyriproxyfen is now being assayed as a ULV formulation on larvae and adults mosquitoes, in a closed shed 420 m2 according to methodology described in our laboratory. It is concluded that these new slow release formulations, could result a good alternative with more favorable properties than the larvicide temefos for mosquito larvae control.

enviar mensaje