6种植物精油对天然除虫菊素的增效活性研究

目的研究天然冬青油、冷榨桔子油、蒸馏桔子油、柠檬草油、蓝桉油、艾叶油共6种植物精油对天然除虫菊素的增效活性,为开发植物源卫生杀虫剂提供参考。方法微量点滴法。结果在10μg/只的剂量下,6种精油对家蝇无明显毒杀活性,家蝇的24 h死亡率均不超过10%;与天然除虫菊素以10∶1（w∶w）混配后,6种植物精油均能使天然除虫菊素对家蝇的24 h死亡率提高10%以上,显示出一定的增效活性,其中柠檬草油的增效活性最好,家蝇的24 h死亡率提高了29%;柠檬草油与天然除虫菊素的较优配比为8∶1（w∶w）,增效比值为1.567。结论柠檬草油可作为增效剂与天然除虫菊素混配使用,提高其杀虫效果。

Synergism of six essential oils to natural pyrethrin

Objective To examine the synergism of six essential oils to natural pyrethrin. Essential oils included nature wintergreen oil, cold squeeze mandarin oil, steam distillation mandarin oil, lemongrass oil, eucalyptus globulus oil ,and eucalyptus oil, which can provide references for the development of botanical pesticides against pests. Methods Micro-drop method. Results On the concentration of 10p, g/insect, six essential oils had no toxic effects on Musca domestica, and the mortality was less than 10%. Six essential oils had different degree of synergism to natural pyrethrin, they could increase at least 10% mortality of Musca domestica in ratio of 10：1 （w： w）with natural pyrethrin. Lemongrass oil had the best synergism, it increased 29% mortality of Musca domestica. A better ratio of lemongrass oil and natural pyrethrin was 8：1 （ w： w） ,and the SR was 1. 567. Conclusion Lemongrass oil could be mixed with natural pyrethrin as a synergist and it could increase the insecticidal effect of natural pyrethrin.