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Survival and growth of different instar larvae of Helicoverpa armigera (Hubner) on transgenic Bt cotton



Survival and growth of different instar larvae of Helicoverpa armigera (Hubner) on transgenic Bt cotton



Acta Entomologica Sinica 41(4): 354-358



The transgenic cotton line R93-4 expressing the Bacillus thuringiensis CryIA gene was used for evaluating the effects of Bt cotton on the survival and growth of different instar larvae of the cotton bollworm, Helicoverpa armigera. Significant insecticidal activity of Bt cotton leaves was observed only on the first instar larvae successively feeding for 3 days. No larva could survive to pupation when fed on Bt cotton leaves continuously starting at the 1st, 2nd, 3rd or 4th instar.

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Accession: 003290239

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