Latest Cover

Online Office

Contact Us

Issue:ISSN 2095-1353
           CN 11-6020/Q
Director:Chinese Academy of Sciences
Sponsored by:Chinese Society of Entomological;institute of zoology, chinese academy of sciences;
Address:Chaoyang District No. 1 Beichen West Road, No. 5 hospital,Beijing City,100101, China
Tel:+86-10-64807137
Fax:+86-10-64807137
Email:entom@ioz.ac.cn
Your Position :Home->Past Journals Catalog->2018年55 No.1

Frequency of Bt resistant alleles in wild cotton bollworm populations
Author of the article:LI Guo-Ping1** GAO Li-Na1 HUANG Jian-Rong1 JI Ting-Jie1 HUANG Bo1 TIAN Cai-Hong1 LU Yan-Hui2
Author's Workplace:1. Henan Key Laboratory of Crop Pest Control, MOA’S Regional Key Laboratory of Crop IPM in Southern Part of Northern China, Institute of Plant Protection, Henan Academy of Agricultural Sciences, Zhengzhou 450002, China; 2. State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing 100193, China
Key Words: Helicoverpa armigera, Cry1Ac, resistance allele frequency, resistance monitoring
Abstract:

 [Objectives]  To determine changes in sensitivity to the Cry1Ac toxin in Helicoverpa armigera (Hübner) (Lepidoptera: Noctuidae) in the Xinxiang cotton growing region, Henan Province. [Methods]  The frequency of alleles conferring resistance to Cry1Ac toxin and the relative average development rates of H. armigera collected in Xinxiang were assessed from 2013-2016 using the F1 and F2 offspring, iso-female lines, combined discrimination dose method. [Results]  From 2013-2016, the frequency of resistant genes in Xinxiang fluctuated between 0 and 0.002 12 and there was no significant increase from 2013 to 2016. Based on the relative average development rates of H. armigera larvae in F1 tests, a substantial decrease in Cry1Ac tolerance was found over the 3 years period. [Conclusion]  The results of our 3 years study suggest that the frequency of resistant alleles is low and that H. armigera in the Xinxiang region are still sensitive to Bt cotton. A decrease in the area planted in Bt cotton may have delayed the development of resistance to Bt cotton in this region.

CopyRight©2024 Chinese Journal of Aplied Entomology