Evaluation of permethrin-impregnated mosquito-nets against mosquitoes in China |
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Authors: | XU JINJIANG,ZAO MEILUAN,LUO XINFU,GENG RONGEN,PAN SHIXIAN,LIU SHUYOU&dagger |
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Affiliation: | Institute of Parasitic Diseases, Chinese Academy of Preventive Medicine (WHO Collaborating Centre for Malaria, Schistosomiasis and Filariasis), Shanghai. |
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Abstract: | In Yishan County, Guangxi Province, China, where malaria and Brugian filariasis are transmitted by vectors belonging to the Anopheles hyrcanus Pallas group, a study was conducted from June to November 1986 to evaluate the effectiveness of permethrin-impregnated mosquito bednets to reduce man/vector contact. In three experimental villages a total of 246 mosquito nets were treated with permethrin EC at a dosage of 0.5 g/m2. Control bioassays (1 h exposure) of treated nets gave up to 100% mortality of Armigeres subalbatus (Coquillett), Anopheles sinensis Wiedemann and Culex tritaeniorhynchus Giles for up to 19 weeks. During 5 months evaluation in the villages, permethrin-impregnated mosquito-nets reduced the number of mosquitoes found inside nets by 99.3% for Culex quinquefasciatus Say, by 94.4% for Anopheles sinensis Wiedemann and by 75% for Anopheles lesteri anthropophagus Xu & Feng. This measure could thus be considered an appropriate means of controlling vectors in villages. |
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Keywords: | Permethrin bednets malaria vectors Brugian filariasis vectors Anopheles sinensis Anopheles lesteri anthropophagus Armigeres subalbatus Culex quinquefasciatus Culex tritaeniorhynchus China |
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