Singh, T V K and Kukanur, V S and Supriya, G B (2021) Frequency of resistance alleles to Cry1Ac toxin from cotton bollworm, Helicoverpa armigera (Hübner) collected from Bt-cotton growing areas of Telangana state of India. Journal of Invertebrate Pathologyy, 183. pp. 1-5. ISSN 0022-2011
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Transgenic cotton expressing Bacillus thuringiensis (Bt) cry1Ac and cry2Ab toxin genes is widely cultivated to manage bollworm complex in India. Cotton bollworm Helicoverpa armigera (Hübner) is one of the most serious of this complex. It is likely to evolve resistance to Cry toxins in view of continual selection pressure due to extensive cultivation of Bt cotton. Monitoring susceptibility of cotton bollworm using conventional bioassays is reported to have shown its increasing tolerance to Cry1Ac over the years. We report using an F2 screen Cry1Ac resistance allele frequencies of 0.050 (95% CI 0.022–0.076) and 0.056 (95% CI 0.035–0.075) in the insect populations collected from pigeon pea grown alongside Bt cotton in the respective years of 2016 and 2017 in the Telangana state of India. Compared to our earlier studies for 2013 and 2014, resistance allele frequency to Cry1Ac in the cotton bollworm in the following two years remains unchanged. The significance of these results is discussed in the context of non-Bt host crops acting as refuge for cotton bollworm for ensuring sustainable resistance management.
| Item Type: | Article |
|---|---|
| Divisions: | RP-Resilient Dryland Systems |
| CRP: | UNSPECIFIED |
| Uncontrolled Keywords: | cotton bollworm, Bt-cotton, Helicoverpa armigera (Hübner), Telangana, India |
| Subjects: | Others > Entomology Others > India |
| Depositing User: | Mr Nagaraju T |
| Date Deposited: | 09 Jul 2024 04:38 |
| Last Modified: | 09 Jul 2024 04:38 |
| URI: | http://oar.icrisat.org/id/eprint/12745 |
| Official URL: | https://www.sciencedirect.com/science/article/abs/... |
| Projects: | UNSPECIFIED |
| Funders: | UNSPECIFIED |
| Acknowledgement: | This research was supported by the Indian Council for Agricultural Research under Emeritus Scientist Project. We are grateful to Dr DA Andow for statistical analysis and Dr GT Gujjar for reviewing and helpful comments on a previous version of the manuscript... |
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