棉 花 学 报       Cotton Science     2008，20(6)：470-472

Analysis of Frequence of Resistance Allele to Bt Cotton in Field Cotton Boll Worm Populations
LIU Feng-i, XU Zhi-ping, SHEN Jin-liang^*
(Key Laboratory of Monitoring and Management of Plant Diseases and Pest Insects,Ministry of Agriculture, Department of Pesticide Science, College of Plant Protection, Nanjing Agricultural University,Nanjing 210095, China )

Abstract：Using F₁ and F₂ screen methods, the frequencies of resistance allele to Bt cotton in field cotton bollworm population in Qiuxian County Hebei province in 2005 ， were estimated as 0.047 (95%CI: 0.002-091) for F₁ screen and 0.015 (95%CI: 0.0067-0.0277) with a detection probability 93.8% for F₂ screen, respectively, which almost increased about 10% than the frequency (0.0058) from 1999. The result cautioned that the resistance of H. armigera in this region had clearly increased from 1999 to 2005 and effective resistance management strategies need to be implemented as soon as possible.
Key words：cotton bollworm；Bt cotton；F₁ screen；F₂ screen；resistance frequency
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