阿维菌素与植物精油复配对朱砂叶螨杀螨的增效作用研究

为了得到对朱砂叶螨(Tetranychuscinnabarinus)具有较好杀螨活性的植物精油与阿维菌素复配配方,并为杀螨剂开发应用提供指导,本研究采用喷雾法测定了柠檬草、广藿香、山鸡椒、亚洲薄荷植物精油及阿维菌素对朱砂叶螨的毒力,分别采用共毒因子法和共毒系数法评价了山鸡椒和亚洲薄荷精油对阿维菌素的增效作用和复配最佳配比.结果表明,柠檬草精油和广藿香精油基本无杀螨活性,山鸡椒精油、亚洲薄荷精油处理朱砂叶螨24h后LC50分别为772.801mg/L和1040.187mg/L.阿维菌素与亚洲薄荷1∶272,1∶679复配具有增效作用.阿维菌素与亚洲薄荷1∶400复配时共毒系数最大,可达160.因此,阿维菌素与亚洲薄荷1∶400复配防治朱砂叶螨具有明显增效作用,这为杀螨剂的开发应用研究提供了参考.

Study on the Synergetic Effect of Avermectins and Plant Essential Oils Used in Combination Against Tetranychus cinnabarinus

To obtain the compound formulations of plant essential oil and avermectin with good acaricidal activity against Tetranychus cinnabarinus,the synergistic effects of essential oils of lemongrass,patchouli,pheasant pepper and Asian peppermint on avermectin were evaluated with the co-toxicity factor method and the co-toxicity coefficient method.A bioactivity test results showed that the essential oils of lemongrass and patchouli had no effect against T.cinnabarinus,and the LC 50 of pheasant pepper and Asian peppermint essential oils was 772.801 and 1040.187 mg·L-1 after 24 h treatment,respectively.The results of co-toxic factor assay showed that the combination of abamectin and Asiatic mint 1∶272 and 1∶679 had synergistic effect,and the results of co-toxicity coefficient showed that the co-toxicity coefficient of abamectin combined with Asiatic mint at 1∶400 was the largest.In conclusion,the compounding of abamectin and Asian peppermint essential oil(1∶400)has an obvious synergistic effect against mites,which provides a theoretical basis for the development and application of acaricide.