Relative efficacy of synthetic pyrethroid-impregnated fabrics against mosquitoes under laboratory conditions

The efficacy of synthetic pyrethroid-impregnated fabrics was evaluated agai nst Anopheles stephensi, Aedes aegypti, and Culex quinquefasciatus, under l aboratory conditions. Results revealed that deltamethrin was significantly superior in comparison to lambdacyhalothrin and cyfluthrin. Results of bioa ssay tests revealed that deltamethrin was 1.5 and 1.9 times more effective than lambdacyhalothrin and cyfluthrin, respectively, against An. stephensi exposed to cotton fabric treated at 100 g/m(2). Deltamethrin was 3.9 and 4. 6 times more effective against Ae. aegypti and 3.53 and 4.0 times more effe ctive against Cx. quinquefasciatus. Of cotton, nylon, polyethylene, and jut e fabrics, the cotton was the best on the basis of median lethal dose (LD50 ) and 95% lethal dose (LD90) values and persistence of insecticide.