Resistance monitoring of Helicoverpa armigera (Lepidoptera : Noctuidae) to Bacillus thuringiensis insecticidal protein in China

文献类型： 外文期刊

第一作者： Guo, YY

作者： Guo, YY;Lv, N;Greenplate, JT;Deaton, R

作者机构：

关键词： Helicoverpa armigera;Bt protein;Cry1Ac protein;resistance monitoring

期刊名称：JOURNAL OF ECONOMIC ENTOMOLOGY （ 影响因子：2.381； 五年影响因子：2.568 ）

ISSN： 0022-0493

年卷期： 2002 年 95 卷 4 期

页码：

收录情况： SCI

摘要： Sensitivities of Helicoverpa armigera (Hubner) field populations to Bacillus thuringiensis (Bt) insecticidal protein Cry1Ac were monitored during 1998-2000 in China. A total of 41 strains was sampled, and most of them were collected from Bt cotton planting regions. The range of IC50 values (concentration producing 50% inhibition of larval development to third instar) among different populations in 1998, 1999, and 2000 were 0.020-0.105 mug/ml. 0.016-0.099 mug/ml, and 0.016-0.080 mug/ml, respectively. Diagnostic concentration studies (IC99) showed that the percentage of individuals reaching third instar ranged from 0 to 4.35% with only eight of the 41 tested populations showing values above 0%. Also interesting was a trend over successive years in which fewer populations contained individuals that survived the diagnostic concentration by reaching third instar. Considering these data, it was determined that the field populations sampled during the 3-yr study were susceptible to Cry1Ac protein and that movement toward resistance among H. armigera populations was not apparent.

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