Khaliq A, Attique M N R, Sayyed A H
Department of Entomology, University of Arid Agriculture, Shamsabad, Murree Road, Rawalpindi 46300, Pakistan.
Bull Entomol Res. 2007 Apr;97(2):191-200. doi: 10.1017/S0007485307004877.
The susceptibility of representative pyrethroid (cypermethrin, deltamethrin, lambdacyhalothrin, bifenthrin), organophosphate (chlorpyriphos, triazophos, profenophos) and new chemistry insecticides (spinosad, indoxacarb and emamectin) was investigated for 18 field populations of Plutella xylostella (Linnaeus) from three different zones in Pakistan. The LC(50) (mg ml(-1); 48 h) values of pyrethroids for various populations ranged from 0.19-1.88 for cypermethrin, 0.31-2.64 for deltamethrin, 0.08-1.16 for lambdacyhalothrin and 0.07-0.88 for bifenthrin. The LC(50) (mg ml(-1); 48 h) of organophosphates ranged from 0.52-5.67 for chlorpyriphos, 0.37-4.14 for triazophos and 0.03-2.65 for profenophos. The most probable reason for low toxicity of organophosphates and pyrethroids is the evolution of multiple resistance mechanisms; however, further studies are required to establish these mechanisms. When these same products were tested against a susceptible laboratory population (Lab-Pak), the new chemistry compounds were significantly more toxic than pyrethroids and organophosphates. The results are discussed in relation to integrated pest management and insecticide resistance management strategies for P. xylostella.
对来自巴基斯坦三个不同地区的18个小菜蛾田间种群，研究了代表性拟除虫菊酯类（氯氰菊酯、溴氰菊酯、高效氯氟氰菊酯、联苯菊酯）、有机磷类（毒死蜱、三唑磷、丙溴磷）和新型化学杀虫剂（多杀菌素、茚虫威和甲氨基阿维菌素苯甲酸盐）的敏感性。不同种群拟除虫菊酯类的LC(50)（mg ml(-1)；48小时）值，氯氰菊酯为0.19 - 1.88，溴氰菊酯为0.31 - 2.64，高效氯氟氰菊酯为0.08 - 1.16，联苯菊酯为0.07 - 0.88。有机磷类的LC(50)（mg ml(-1)；48小时），毒死蜱为0.52 - 5.67，三唑磷为0.37 - 4.14，丙溴磷为0.03 - 2.65。有机磷类和拟除虫菊酯类毒性低的最可能原因是多种抗性机制的进化；然而，需要进一步研究来确定这些机制。当用这些相同产品对敏感的实验室种群（Lab-Pak）进行测试时，新型化学化合物的毒性明显高于拟除虫菊酯类和有机磷类。针对小菜蛾的综合虫害管理和杀虫剂抗性管理策略对这些结果进行了讨论。
