2004•Unpublished venueRequires access
Effect of Cypermethrin Mixed with Different Synergists against Culex pipiens pallens larvae
Sun Chuan-hong
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Abstract
Objective To study the control effect of cypermethrin mixed with different synergists against Culex pipiens pallens larvae. Method Cypermethrin was mixed with different synergists piperonyl butoxide(S 1), octachlorodipropylether(S 2) and octacide 264(S 3) respectively. Larvae of Culex pipiens pallens collected from Tengzhou City, Taian City and Tangkou Township of Jining City were bred in the laboratory of the Institute and the 4th instar larvae of first filial generation were tested. LC 50 and synergistic cofficient were calculated by standard bioassay method recommended by WHO. Result The synergistic cofficients of cypermethrin mixed with S 1, S 2 and S 3 were 2.53~3.76, 2.33~2.70 and 2.28~3.52 respectively, showing better synergism. Conclusion After the mosquitoes yield resistance to cypermethrin, the mixed use of cypermethrin with synergists may provide better efficacy.