Acta Entomologica Sinica (1998) 41, 354-358

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Jianzhou Zhao, Meiguang Lu, Xianlin Fan and Feizhou Xie (1998)
[Survival and growth of different instar larvae of Helicoverpa armigera (Hubner) on transgenic Bt cotton]
Acta Entomologica Sinica 41 (4), 354-358
Abstract: Transgenic cotton line R93-4 expressing Bacillus thuringiensis Cry1A 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 (Hübner). 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 1st, 2nd, 3rd or 4th instar. But started feeding on Bt cotton leaves at fifth instar, larvae could normally survive to pupae. The inhibition effect of Bt cotton on the growth of larvae was more obvious than the lethal effect. The mortality and growth inhibition of larvae by Bt cotton were higher at 28°C as compared with 25°C. The results are valuable for further research on the monitoring and management techniques of the pest resistance to Bt cotton.
(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): Mei-Guang Lu

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
evaluation - screening - selection
genetical engin./transgenic plants

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Helicoverpa armigera Cotton (Gossypium)
Bacillus thuringiensis genes in crops (entomopathogen) Helicoverpa armigera Cotton (Gossypium)
Bacillus thuringiensis Cry1A-toxin (entomopathogen) Helicoverpa armigera Cotton (Gossypium)