杀虫剂混配对抗DDVP淡色库蚊的毒力及增效作用的研究

目的 为延缓抗性的发展，测定了淡色库蚊幼虫DDVP抗性品系对常用的几种杀虫剂混用后的敏感性及与增效剂氯化胡椒基丁醚(S1)、八氯二丙醚(S2)和增效胺混用的效果。方法采用WHO生物测试法。计算LC50、增效系数。结果DDVP 三氯杀虫酯、氯氰菊酯 残杀威、氯氰菊酯 DDVP、残杀威 三氯杀虫酯，各组共毒系数分别为180．07～237．50、158．11～198．95、155．22～175．00、120．28～132．12；DDVP S2、DDVP S1、DDVP 增效胺的增效系数分别为2．96～11．36、1．49～2．18、1．41～1．59。结论当淡色库蚊对DDVP产生抗药性后。氯氰菊酯或三氯杀虫酯与DDVP或残杀威混用均能取得较好的防制效果。DDVP与增效剂复配亦有增效作用。

Study on the Toxicity and Synergism of Insecticide Mixtures to DDVP-Resistant Culex pipiens pallens

Objective The toxicity and synergism of several commonly used insecticide mixtures, and DDVP mixed with synergists, to the larvae of DDVP-resistant Culex pipiens pallens were detected to delay the development of mosquito resistance to insecticides. Methods WHO standard bioassay was employed to calculate LC_~50 and synergistic coefficient. Results The synergistic effects of propoxur+acetophenate, ~DDVP+ acetophenate, cpermethrin+DDVP and cpermethrin+propoxur was ~139.94- ~151.95 , ~125.62- ~133.29 , ~151.09- ~175.81 , and ~143.04- ~151.83 , repectively, and those of DDVP+S_1, DDVP+S_2, DDVP+Amine Synergist were ~4.73- ~7.31 ,~2.97- ~5.46 and ~2.43- ~4.11 , respectively. Conclusion The insectide mixtures of pyrethroids or organochloride with organophosphate or carbamate may have better efficacy against DDVP-resistant mosquitoes, and the mixed use of the insecticide with synergists may also provide better efficacy.