Acta Entomologica Sinica (1998) 41, 8-14

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Jinliang Shen, Weijun Zhou, Yidong Wu, Xiangwen Lin and Xiefei Zhu (1998)
[Early resistance of Helicoverpa armigera (Hubner) to Bacillus thuringiensis and its relation to the effect of transgenic cotton lines expressing BT toxin on the insect]
Acta Entomologica Sinica 41 (1), 8-14
Abstract: Susceptible bioassay base line and discrimination doses for biopesticide Bacillus thuringiensis (Bt) on susceptible strain (SUS1) of Helicoverpa armigera (Hübner) with the diet infection method were established. The susceptibilities to commercial Bt subspecies kurstaki formulation in newly hatched larvae of H. armigera collected from six counties of five provinces were tested in 1995. The results indicated that the five populations of H. armigera from Yanggu (Shandong), Handan (Hebei), Xinxiang (Henan), Xiaoxian (Anhui) and Fengxian (Jiangsu) showed early resistance to Bt. The proportion of resistant individuals in this insect at the 5 locations was 5%~10%; LC50 values increased slightly but the slope (b) decreased significantly as compared with those of susceptible strain. However, Dongtai population (Jiangsu) was still susceptible. The biopesticide Bt resistance of H. armigera was diagnosed for the first time. The effects of trangsgenic cotton lines expressing Bt toxin on various populations of H. armigera with foliage-feeding method were also determined. The results indicated the average mortality of newly hatched larvae of H. armigera (Yanggu and Xinxiang) with early resistance to Bt declined significantly (about 16%~29%) compared with those of susceptible strain. It's suggested that populations of H. armigera from Yanggu and Xinxiang were resistant to biopesticide Bt and transgenic cotton expressing Bt toxin. The resistant management strategy of biopesticide Bt is discussed.
(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): Jin Liang Shen

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
pesticide resistance of pest
Research topic(s) for beneficials or antagonists:
resistance/tolerance/defence of host


Pest and/or beneficial records:

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


Helicoverpa armigera China (south)
Helicoverpa armigera Cotton (Gossypium) China (NE)
Bacillus thuringiensis var. kurstaki (entomopathogen) Helicoverpa armigera Cotton (Gossypium) China (NE)
Bacillus thuringiensis genes in crops (entomopathogen) Helicoverpa armigera Cotton (Gossypium) China (NE)