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首页> 外文期刊>Pest Management Science >Using an F2 screen to monitor frequency of resistance alleles to Bt cotton in field populations of Helicoverpa armigera (Hubner) (Lepidoptera: Noctuidae)
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Using an F2 screen to monitor frequency of resistance alleles to Bt cotton in field populations of Helicoverpa armigera (Hubner) (Lepidoptera: Noctuidae)

机译：使用F2屏幕监测棉铃虫（Hubner）（鳞翅目：夜蛾科）田间种群对Bt棉的抗性等位基因频率

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BACKGROUND: In an effort to control the most devastating cotton pest, Helicoverpa armigera (Hubner), in Qiuxian County (Hebei, China), Bt cotton has been planted almost exclusively since 1998 in this area. Owing to the high insecticidal selection pressures in this region, monitoring of Bt resistance in H. armigera is necessary so that proactive actions can be implemented before field control measures fail. From 2003 to 2005, an F2 screen was conducted in order to monitor Bt resistance in H. armigera populations collected from this area. RESULTS: The F2 screen showed that 15 out of 278 isofemale lines carried resistance alleles to Bt cotton. The resistance allele frequency in field populations of H. armigera ranged from 0.0119 to 0.0297, with an overall frequency of 0.0146 and a 95% confidence interval of 0.0084-0.0225 for the 3 year period. This value is greater than the value reported from 1999 (P < 0.05).CONCLUSION: A fluctuating but overall increase in resistance allele frequency was detected in the field populations of H. armigera in Qiuxian County from 1999 to 2005. To prevent further increases in Bt resistance frequency in this pest, it is necessary to introduce Bt cotton expressing multiple Bt toxins and integrate this technology with other tactics for management of this key pest.
机译：背景：为控制最具破坏力的棉虫，位于中国河北省邱县的棉铃虫（Hubner），自1998年以来，Bt棉几乎只在该地区种植。由于该区域杀虫剂选择压力高，因此有必要监测棉铃虫对Bt的抗性，以便在田间控制措施失败之前采取积极行动。从2003年到2005年，进行了F2筛选，以监测从该地区收集的棉铃虫种群中的Bt抗性。结果：F2筛选显示，在278个等位女性系中，有15个携带对Bt棉的抗性等位基因。棉铃虫田间种群的抗性等位基因频率范围为0.0119至0.0297，三年期间的总频率为0.0146，95％置信区间为0.0084-0.0225。该值大于1999年的报告值（P <0.05）。结论：1999年至2005年秋丘县棉铃虫田间种群的抗性等位基因频率有所波动，但总体上有所增加。该害虫对Bt的抗性频率高，有必要引入表达多种Bt毒素的Bt棉，并将该技术与其他策略结合起来以管理该关键害虫。

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