金合欢醇和烟碱对苹果黄蚜联合毒杀作用

以苹果黄蚜Aphis citricolavander Goot为试虫，对金合欢醇和烟碱的联合杀蚜活性进行了测定，以期为开发植物源杀蚜剂产品奠定基础。室内毒力测定采用微量点滴法；田间药效试验参照国家标准进行。金合欢醇和烟碱混用具有明显的杀蚜增效作用，在最佳质量配比（金合欢醇:烟碱=4.82:1）下，共毒系数（CTC）达151.63；经过对溶剂、表面活性剂等助剂的筛选，研制出6%烟碱·金合欢醇可溶液剂，配方为金合欢醇（5%）、烟碱（1%）、表面活性剂（10%）、溶剂（84%），质量检测符合可溶液剂国家质量标准；田间药效试验表明，以126.0 g a.i./hm²常量喷雾，药后7 d对小麦上的麦长管蚜Sitobion avenae Fabricius和麦二叉蚜Schizaphis graminum（Rondani）混合种群的防效达87.80%，以115.5 g a.i./hm²常量喷雾，药后7 d对苹果黄蚜的防效在81%以上。可见，金合欢醇和烟碱复配具有显著的杀蚜增效作用，具有进一步开发潜力。

Joint Insecticidal Action of Farnesol and Nicotine against Aphis citricolavander Goot

For the development of new botanical aphicides, the joint aphidicidal action of farnesol and nicotine against Aphis citricolavander Goot was evaluated using bioassay by topical application and field trial according to the China national standard. The mixture of farnesol and nicotine showed significant synergy effect against A. citricolavander, with a co-toxicity coefficient (CTC) of 151.63 at the optimal ratio of farnesol to nicotine (4.82:1, w/w). Based on the result of solvents and surfactants screening, a 6% farnesol·nicotine soluble concentrate (6% F·N SL) was developed, which consisted of 5% farnesol, 1% nicotine, 10% surfactants, and 84% solvents, with quality measuring up with the National SL Quality Standard. Field trials showed a 87.80% control efficiency by 126.0 g a.i./hm² of 6% F·N SL against the mixed populations of Sitobion avenae Fabricius and Schizaphis graminum (Rondani) at 7 d post spraying, and an above 81% control efficiency by 115.5 g a.i./hm² of 6% F·N SL against Aphis citricolavander Goot at 7 d post spraying. Thus, the mixture of farnesol and nicotine has a significant synergy effect against aphids and is of potential to be further developed as a botanical pesticide.