TY - JOUR T1 - The excito –repellency effect of pyrethroid insecticide-treated bednets on An. stephensi under laboratory condition TT - بررسی خاصیت تحریکی دفعی توری‎های آغشته به سه نوع حشره‎کش پایروتروئید روی آنوفل استفنسی در شرایط آزمایشگاهی JF - ISMJ JO - ISMJ VL - 8 IS - 2 UR - http://ismj.bpums.ac.ir/article-1-66-en.html Y1 - 2006 SP - 119 EP - 125 KW - insecticides KW - pyrethroid KW - bednets KW - An. stephensi N2 - Background: The excito-repellency effect due to the application of some insecticides is important in interrupting the malaria transmission cycle. The repellency effect of some insecticides also inhibits the entry of mosquitoes into sprayed houses, which in long-term causes alteration in endophilic and exophilic rates. Methods: In this study, a modified excito-repellency (E-R) test box was used. In order to standardize this system, a number of methods and techniques were considered to evaluate the mosquitoes’ reaction to pyrethroid-impregnated nets. A cylindrical guinea – pig holder made up of aluminum mesh was placed within the exposure chamber. Treated and untreated nets covered this holder so that the guinea pig was available to mosquito for bloodfeeding. An exit trap was devised on the rear side of the exposure chamber. Nets were impregnated with lambdacyhalothrin insecticide at the concentrations of 12.5, 25 and 50 mg/m2, deltamethrin at 12.5, 25 and 50 mg/m2 and cyfluthrin at 40, 80 and 100 mg/m2 or unimpregnated in laboratory by standard dipping procedure. The bloodfeeding rate, exit rate, survival rate, mortality rate and recovery rate of mosquitoes were considered. Results: The results obtained using one-way analysis of variance (ANOVA) reflects a significant difference in excito-repellency of tested insecticides (p M3 ER -