Volume 15, Number 72 (1-2008)                   daneshvarmed 2008, 15(72): 13-20 | Back to browse issues page

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dehaki M, javadian E, vatandoost H, abaei M. Comparison the Effect of Bed Nets Saturated with Lambdacyhalothrin Insecticide, Bifenthrin and DEET on Blood-Feeding Anopheles stephensi (Diptera: Culicidae), The Vector of Malaria. daneshvarmed. 2008; 15 (72) :13-20
URL: http://daneshvarmed.shahed.ac.ir/article-1-409-en.html

3. Assistant Professor Department of Medical Entomology, Faculty of Hygiene, Tehran University of Medical Sciences
Abstract:   (8299 Views)

 Introduction: Malaria is still one of the most important communicable diseases in the world. The main measure for vector control is using insecticides as residual spraying and recently impregnated bednet with pyrethroid insecticides. Comparative study on the efficacy of pyrethroid impregnated torn bed nets (lambdacyhalothrin and bifenthrin) and Deet against malaria vector, Anopheles stephensi, (Diptera: Culicidae) by tunnel tests method. 

 Aims and objectives: The effect of torn impregnated bed nets treated three doses of bifenthrin TALSTAR®7.8% SC, Lambdacyhalothrin 2.5% CS and DEET were evaluated under laboratory condition. The objective of the present study was to compare the efficacy of pyrthroid insecticides and Repellents for impregnation of mosquito nets, on the susceptible strains of Anopheles stephensi.

 Materials and Methods: Efficacy of two pyrethroid-impregnated nets and DEET-impregnated nets were designed to inhibition hungry female mosquitoes to pass through holes cut in the netting. Mortality and blood-feeding inhibition were measured using a baited tunnel device.

 Results: With untreated netting, 95-98% of female mosquitoes passed through the holes overnight, 94-97% blood-fed successfully and 1-4% died. When the netting was treated with bifenthrin at doses of 3.125, 6.25 and 25 mg/m2, the number of mosquitoes passed through the holes overnight were 3%, 7% and 12% mortality rates were 94.5%, 95.5% and 94.5% inhibition blood-feeding was also high 100%, 100% and 97%. When the netting was treated with lambdacyhalothrin at doses of 2.5, 5 and 20 mg/m2, the overnight entry index were respectively 71.5%, 12.5% and 5%, mortality rates were 45.5%, 88% and 97%, inhibition blood-feeding were obtained 38%, 97.5% and 100%. Results showed that at 2.5, 5 and 20 g/m2 of DEET impregnated nets 28.5, 25 and 7% of mosquitoes were able to pass through holes in the tunnel, respectively. Inhibition of biting at three interval doses, 2.5, 5 and 20 g/m2 was 93.5%, 97.5% and 100%, respectively and mortality rates were 91.5%, 86.5% and 92.5% which is significantly different compared to control.

 Discussion and conclusion: Bifenthrin and DEET caused high mortality at the lower concentration and also we observed a significant inhibition of blood-feeding with these compounds, even at the lower concentration. Despite its slower Knock-down effect and irritancy. Slower Knock-down effect, lower irritability and higher toxicity of bifenthrin than other pyrethriods, caused it suggested for treatment of mosquito nets against An.stephensi. Selection of pyrethroids for mosquito vector control and personal protection should take into account the different effect of these insecticides, the status of pyrethroid resistance in the target area, and the importance of nuisance mosquitoes.

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