Acta Entomologica Sinica (2002) 45, 567-570

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Chang-Hui Rui, Xian-Lin Fan, Feng-Shou Dong and San-Dui Guo (2002)
Temporal and spatial dynamics of the resistance of transgenic cotton cultivars to Helicoverpa armigera (Hübner)
Acta Entomologica Sinica 45 (5), 567-570
Abstract: Temporal and spatial insecticidal activities of three different transgenic cotton cultivars were evaluated: Nu-COTN 33B cultivar expressing Cry1Ac insecticidal protein gene from Bacillus thuringiensis (Bt), developed by the Monsanto Company; GK12 expressing modified Cry1A Bt gene, developed in China; and SGK321 expressing both Bt and cowpea trypsin inhibitor (CpTI) genes, also developed in China. Two strains of cotton bollworm (CBW), Helicoverpa armigera (Hübner) with different susceptibility to Bt were used. Insecticidal activity in all three cultivars declined through time as plants grew, leaves had the highest insecticidal activity early in the growing season, but bolls and square showed higher insecticidal activity in the middle or late growing season. All three cultivars showed higher insecticidal effect against the susceptible strain of CBW than against the resistant strain of CBW. SGK321 had significantly higher insecticidal activity to CBW in the middle and late growing season (August and September), and also displayed more consistent resistance to the resistant strain of CBW compared to the other two cultivars.
(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:
resistance/tolerance/defence of host
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution
resistance/tolerance/defence of host

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)