Differences in resistance to fenvalerate and cyhalothrin and inheritance of knockdown resistance to fenvalerate in Helicoverpa armigera

文献类型： 外文期刊

第一作者： Wei, C

作者： Wei, C;Zhao, JZ;Liu, AX

作者机构：

期刊名称：PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY （ 影响因子：3.963； 五年影响因子：4.454 ）

ISSN： 0048-3575

年卷期： 1998 年 61 卷 2 期

页码：

收录情况： SCI

摘要： A resistant strain of Helicoverpa armigera selected by cyhalothrin was used to investigate the relative importance of knockdown resistance (kdr) for different levels of resistance to cyhalothrin and fenvalerate and the inheritance of kdr to fenvalerate. Pretreatment of piperonyl butoxide (PBO) decreased the resistance ratios from 30.6- to 5.0-fold for cyhalothrin and from 337.0- to 38.0-fold for fenvalerate. Electrophysiological studies showed that kdr ratios were 10.7- and 95.8-fold to cyhalothrin and fenvalerate, repectively, at EC50 of burst discharge of neuromuscle preparation, and were 15.0- and 507.2-fold to cyhalothrin and fenvalerate, respectively, at EC50 Of blocked neuromuscular transmission. It was indicated that the difference in kdr to fenvalerate and cyhalothrin is the main reason for the difference in resistance level between the two pyrethroids in the resistant strain of H. armigera. Analysis of probit lines from F-1 reciprocal crosses indicated that kdr to fenvalerate was inherited autosomaly as an incompletely recessive factor. The degrees of dominance were -0.74 and -0.78, based on burst discharge and blocked transmission, respectively, with pooled F-1 generations. chi 2 analysis of knockdown responses of backcrossed offspring indicated that the resistance might be controlled by one major gene. Cross-resistance to aconitine was detected in resistant strain after applying PBO, indicating that sodium channels are different in the resistant and susceptible strains of H. armigera. (C) 1998 Academic Press.

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