五种植物精油熏杀致倦库蚊的效果

目的:考察菊科植物、芸香科植物、椒样薄荷、留兰香和香茅共5种植物的精油对致倦库蚊的熏蒸杀虫效果.方法:以三角瓶密闭熏蒸法测定5种精油对致倦库蚊的熏杀效果.结果:持续熏蒸不同时间后,5种精油对致倦库蚊的毒力有差异.在熏蒸0.5、4和24h后芸香科植物精油均毒力最大,其LC50分别为0.013、0.055、0.058.而菊科植物精油毒力最小,其3个时间段的LC50分别为0.948、0.427、1.711.用供试植物精油的LC95剂量(0.5h)熏蒸处理致倦库蚊,显示留兰香油的熏杀速度最快,其LT50值为6.087min,而香茅油的最慢,为21.143 min.结论:5种植物精油对致倦库蚊均具有一定的熏杀活性,以芸香科植物精油和留兰香油的杀虫效果较好,为其现场实验提供了基础资料.

Fumigating insecticidal activity of 5 essential oils against Culex pipiens quinquefasciatus

Objective:To observe the fumigating insecticidal activity of 5 essential oils(asteraceae oil,rutaceae oil,mentha piperita oil,carvacryl oil and citronella oil) against Culex pipiens quinquefasciatus.Methods: Fumigating insecticidal activity was investigated by airtight fumigation in conical flask.Results: After different fumigating time,5 essential oils showed different toxity against Culex pipien quinqucfasciatus.Of 5 essential oils,rutaceae oil was the most toxic, with the LC 50 values being 0.013(0.5 h),0.055(4 h) and 0.058(24 h); asteraceae oil was the lowest toxic one, with the LC 50 values being 0.948(0.5 h),0.427(4 h) and 1.711(24 h).When LC 95 values of the 5 essential oils were used to treat Culex pipiens quinquefasciatus,the shortest fumigating time appeared in carvacryl oil(6.087 min) and the longest in citrinella oil(21.143 min).Conclusion: All the 5 essential oils have considerable insecticidal effects against Culex pipiens quinquefasciatus.Rutaceae oil and carvacryl oil are better than the others,which provides basic informations for the related field experiments.