Acta Entomologica Sinica (2003) 46, 705-712

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Chang-Gui Sun, Qing-Wen Zhang, Jing Xu, Yin-Xia Wang and Jun-Li Liu (2003)
[Effects of transgenic Bt cotton and transgenic Bt + CpTI cotton on population dynamics of main cotton pests and their natural enemies]
Acta Entomologica Sinica 46 (6), 705-712
Abstract: Systematic studies were carried out on effects of univalent transgenic cotton ( GK321) containing the gene Cry1Ac and bivalent transgenic cotton (SGK321) carrying the genes Cry1Ac + CpTI on population dynamics of the main pests and their enemies in experimental fields of Chinese Academy of Agricultural Sciences (Xibeiwang, Beijing) from April to October in 2002. This experiment included three treatments. The first was a univalent transgenic cotton plot (UTCP) , the second a bivalent transgenic cotton plot (BTCP) , and the third a routine cotton plot (RCP). The results indicated that both univalent and bivalent transgenic cottons were excellently resistant to the cotton bollworm, Helicoverpa armigera. There was no significant difference in resistance between bivalent and univalent transgenic cottons in the second generation of cotton bollworm; but the resistance of bivalent cotton was significantly higher than that of univalent cotton in the third generation: number of larvae in bivalent cotton plot decreased by 36.6% compared with univalent cotton plot. The populations of non-target pests in transgenic plots were significantly higher than those in normal cotton plot; with regard to individual pest species, number in bivalent and univalent transgenic plots was different. Compared with univalent cotton plot, Aphis gossypii Glover, Empoaca biguttula Shiraki and Bemisia tabaci Gennadius in bivalent transgenic cotton plot decreased in individual number respectively by 33.0% (P < 0.01), 50.6% (P < 0.01) and 22.7% ( P > 0. 05), but Thrips tabaci Lindeman and Lygus lucorum Meyer-Dür increased.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Chinese)

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution
non-target effects/fate in environm.

Pest and/or beneficial records:

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

Helicoverpa armigera Cotton (Gossypium) China (NE)
Bacillus thuringiensis Cry1A-toxin (entomopathogen) Helicoverpa armigera Cotton (Gossypium) China (NE)