Acta Entomologica Sinica (2008) 51, 938-945
Feng-Yi Liu, Yu-Cheng Zhu and Jin-Liang Shen (2008)
[Monitoring resistance to transgenic Bt cotton in field populations of Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) with F1 screening method]
Acta Entomologica Sinica 51 (9), 938-945
Abstract: Development of Bt-susceptible and resistant Helicoverpa armigera and their reciprocal crosses feeding on Bt cotton leaves for 5 d were compared and individuals > 0.6 mg/larva and surviving beyond the mid-2nd instar on Bt cotton leaves for 5 d were considered as the standard for homozygous resistant individuals. In 2006, the frequency of allele conferring resistance to Bt cotton in Qiuxian County Hebei Province was estimated by using the F1 screening method. The results showed that 24 out of 127 field-collected male moths were detected to carry resistance; allele, and the resistance allele frequency was estimated as 0.094 (95 % Cl: 0.044 - 0.154). This is the first report that resistance allele frequency increases to such a high level in fields in China. Long-term adoption of Bt sprays, dominant planting of uni-toxin-producing Bt cotton and lack of conventional cotton refuge system may accelerate the resistance evolution in this region, and it is necessary to establish and implement effective resistance management strategy as soon as possible. Factors influenced resistance evolution and the resistance risk in fields were discussed as well.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Chinese)
Database assignments for author(s): Jin Liang Shen
Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
resistance/tolerance/defence of host
Pest and/or beneficial records:
| Beneficial | Pest/Disease/Weed | Crop/Product | Country | Quarant.
|
|---|---|---|---|---|
| Helicoverpa armigera | Cotton (Gossypium) | China (NE) | ||
| Bacillus thuringiensis genes in crops (entomopathogen) | Helicoverpa armigera | Cotton (Gossypium) | China (NE) |
