摘要：Toxic and feeding inhibition effect of cyfluthrin treated nets was assessed and compared with
the activity of deltamethrin impregnated nets, before and after 2 and 4 washes against Phlebotomus papatasi.
Impregnated cyfluthrin nets (50, 25, 12.5 mg active ingredient (a.i.)/m2) caused knock down and mortality
rates higher than 90%, being of 100% at the highest dose, while the nets impregnated with deltamethrin (25,
12.5, 6.25 mg a.i./m2) showed low mortality rates (13.3-43.5%). Also after washing cyfluthrin at the dose of
50 mg a.i./m2 provided higher activity than deltamethrin (25 mg a.i./m2), being mortality rates within 24 hs of
66.7 and 48.9% for cyfluthrin and 38.0 and 2.1% for deltamethrin, respectively after 2 and 4 washes. Before
washing, cyfluthrin (50 mg a.i./m2) significantly prevented blood feeding, with respect to both untreated
(88.6%) and deltamethrin impregnated nets (56.8%). Deltamethrin (25 mg a.i./m2) showed low feeding
inhibition (48.4%), although it was significantly higher than control. The washing of cyfluthrin impregnated
nets (50 mg a.i./m2) produced a decrease of the feeding inhibition, being the reduction of 26.6% and 41.3%,
respectively after 2 and 4 washes. Two washes of deltamethrin impregnated nets (25 mg a.i./m2) yielded a very
high reduction of antifeeding inibition (68.8%). These laboratory results if confirmed by field evaluation
indicate cyfluthrin as good candidate for treatment of mosquito nets to be used against phlebotomine sandflies.
