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| Toxicity Determination of Several Insecticides and Their Mixtures to Bactrocera（Zeugodacus）cucurbitae（Coquillett） |
| LIU Kui，FU Bu-li，QIU Hai-yan，FU Yue-guan |
| Hainan Key Laboratory for Monitoring and Control of Tropical Agriculture Pests，Environment and Plant Protection Institute，Chinese Academy of Tropical Agriculture，Danzhou 571737，Hainan，China |
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Abstract Four insecticides toxicities to adult of Bactrocera（Zeugodacus）cucurbitae（Coquillett）and their co-efficient ratio were determined by micro drop method．The results showed that LD50 of 80 % dichlorvos EC was minimum for 1.683 9 μg?g-1 and alpha-cypermethrin EC was the largest for 8.877 0 μg?g-1．The toxicity order was 80 % dichlorvos EC＞5 % emamectin-benzoate ME＞480 g?L-1 chlorpyrifos EC＞100 g?L-1 alpha-cypermethrin EC．The co-efficient ratio of the mixture of dichlorvos and emamectin-benzoate（1∶1）was 426．
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Received: 23 December 2010
Published: 11 January 2011
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