4种杀虫剂对棉铃虫抗药性种群幼虫呼吸代谢的影响

利用 L D50 及 L D95剂量的氰戊菊酯、灭多威、甲基对硫磷和硫丹 4种杀虫剂 ,分别处理棉铃虫 H elicoverp a armigra Hübner敏感和抗药性种群的 5龄幼虫 ,测定各药剂对幼虫呼吸代谢的影响。结果表明 ,以 L D50 计 ,氰戊菊酯和灭多威对抗药性种群的处理剂量分别是敏感种群的 15.8和 14.1倍 ,但其呼吸抑制率却显著降低 ;用甲基对硫磷、硫丹处理 30 0～144 0 min对抗药性种群的呼吸抑制率也低于对敏感种群。在 L D95剂量下 ,用氰戊菊酯、甲基对硫磷处理 10～ 6 0 min对抗性种群呼吸抑制率分别为 14.7%～ 2 7.3%和 2 7.2 %～ 15.5% ,而对敏感种群则分别达 4 2 .0 %～ 4 8.6 %和 4 5.8%～ 50 .4 %。

Effects of Four Insecticides on Respiratory Metabolism of Resistant Cotton Bollworm Larvae

The 5 instar larvae of susceptible and resistant populations of cotton bollworm Helicoverpa armigera (Hübner) were treated with fenvalerate, methomyl, parathion-methyl and endosulfan at the LD50 and LD95 dosages. The effects of 4 insecticides on respiratory metabolism to 5 instar larvae were measured. The results showed that although the dosages at the LD50 of fenvalerate and methomyl to R-population were 15.8 and 14.1 fold higher than that of S-population, but the respiratory inhibitory rate of R-population were lower than S-population.The respiratory inhibitory rates of parathion-methyl and endosulfan at LD50 dosages to R-population were lower than that S-population after treating 300～1440 min. At the LD95 dosages, the respiratory inhibotory rates of fenvalerate and parathion-methyl to R-population were 14.7%～27.3% and 27.2%～15.5%,to S-population were 42.0%～48.6% and 45.8%～50.4%. It showed that the endurance abilities of R-population to insecticides and respiratory metabolism were higher than that of S-population.