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Behaviour of Laboratory-Selected Cry1Ac-Tolerant Strain of Helicoverpa armigera (Hubner) (Lepidoptera:Noctuidae) on Bt-Cotton


Affiliations
1 Department of Entomology, Punjab Agricultural University, Ludhiana 141 004, India
 

The effect of Bacillus thuringiensis toxin Cry1Ac on the behaviour of a laboratory-selected resistant population (72-fold) of Helicoverpa armigera on Bt-cotton was evaluated. Compared with non-Bt-cotton and Cry1Ac toxin incorporated in semi-synthetic diet, resistant larvae reared on Bt-cotton had only 0.13% survival and slower development. The results suggest that Cry1Ac from Bt-cotton exerts a greater toxic effect in terms of larval mortality coupled with decline in larval growth rate compared to semi-synthetic diet.

Keywords

Bt-Cotton, Cry1Ac Toxin, Helicoverpa armigera, Resistant Population.
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  • Behaviour of Laboratory-Selected Cry1Ac-Tolerant Strain of Helicoverpa armigera (Hubner) (Lepidoptera:Noctuidae) on Bt-Cotton

Abstract Views: 296  |  PDF Views: 124

Authors

Paramjit Kaur
Department of Entomology, Punjab Agricultural University, Ludhiana 141 004, India
Vinod Kumar Dilawari
Department of Entomology, Punjab Agricultural University, Ludhiana 141 004, India

Abstract


The effect of Bacillus thuringiensis toxin Cry1Ac on the behaviour of a laboratory-selected resistant population (72-fold) of Helicoverpa armigera on Bt-cotton was evaluated. Compared with non-Bt-cotton and Cry1Ac toxin incorporated in semi-synthetic diet, resistant larvae reared on Bt-cotton had only 0.13% survival and slower development. The results suggest that Cry1Ac from Bt-cotton exerts a greater toxic effect in terms of larval mortality coupled with decline in larval growth rate compared to semi-synthetic diet.

Keywords


Bt-Cotton, Cry1Ac Toxin, Helicoverpa armigera, Resistant Population.

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DOI: https://doi.org/10.18520/cs%2Fv112%2Fi07%2F1579-1583