A comparative field study to Evaluate the Efficacy of Lambdacyhalothrin 2.5% (ICON2.5CS) and Permethrin 10% EC for the Impregnation of Mosquito Bednets to Control Anopheles minimus in Ratchaburi Province

Abstract

A field trial was carried out to evaluated the efficacy of Lambda-cyhalothrin 2.5% (ICON 2.5CS) and Permethrin 10% EC for treated bed nets at 10 mg/m² and 300 mg/m² respectively. Impregnated nets were distributed in the two villages, Ban Takolang and Ban Papok, Suanpueng district, Ratchaburi province. The study covered a period of one year, from January 2009-January 2010. Pre-treatment the WHO Test 0.05% Lambda-cyhalothrin impregnated papers was used for testing the insecticides susceptibility. These two mosquito species, Anopheles minimus and Anopheles maculatus were found 100% mortality indicated susceptible to Lambda-cyhalothrin. The residual efficacy of Lambda-cyhalothrin 2.5%
(ICON 2.5CS) treated bed nets indicated that 100% mortality of mosquitoes lasted longer not less than 8 month and decrease to 95% in the twelfth month but for Permethrin 10% EC indicated that 100% mortality of mosquitoes in 2 month, 95% in the fifth month and decrease to 40% in the twelfth month after treated. Therefore, Lambda-cyhalothrin 2.5%
(ICON 2.5CS) is recommended for the treatment of mosquito nets at a dose of 10 mg/m². The expected duration of efficacy is up to 12 months when treated nets are not washed and acceptation of 47 sampling were appreciable using as percentage 100 of good air way on respiration and skin rash, another irritation not appear and percentage 89 mosquito couldn’t bitten and percentage 83 not sense to smelling.