Journal of Applied Entomology (2007) 131, 441-446

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L. Wang, X.-F. Li, J. Zhang, J.-Z. Zhao, Q.-J. Wu, B. Xu and Y.-J. Zhang (2007)
Monitoring of resistance for the diamondback moth to Bacillus thuringiensis Cry1Ac and Cry1Ba toxins and a Bt commercial formulation
Journal of Applied Entomology 131 (7), 441-446
Abstract: To monitor the resistance of field populations of the diamondback moth Plutella xylostella in China to the insecticidal protein Cry1Ac, Cry1Ba and commercial formulation Bacillus thuringiensis var. kurstaki (Btk), six representative populations of the diamondback moth were collected from Shanghai, Shandong, Hubei, Hunan, Zhejiang and Guangdong provinces of China where crucifer crops are intensively planted. Bioassay results showed that the populations of the diamondback moth from different locations exhibited different levels of resistance, compared with a susceptible laboratory population. The Guangdong field population was 56.15- and 21.90-fold resistant to Cry1Ac and Btk, respectively. Shanghai, Hunan, Shandong and Zhejiang populations were 37.85-, 17.24-, 10.24- and 9.41-fold resistant to Cry1Ac, respectively, but were not resistant to Btk. The Hubei population did not show resistance to Cry1Ac and Btk. Almost all tested populations were susceptible to Cry1Ba, but the Guangdong population showed some tolerance to Cry1Ba with a LC50 of 0.69 μg/ml which was 6.17-fold higher than that of the susceptible population. The results suggested that the complex resistance patterns of field populations of P. xylostella need to be considered for expression of Bt toxin genes in genetically-engineered crop plants and commercial formulations.
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Link to article at publishers website


Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
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.


Plutella xylostella China (south)
Plutella xylostella China (NE)
Bacillus thuringiensis var. kurstaki (entomopathogen) Plutella xylostella China (south)
Bacillus thuringiensis Cry1A-toxin (entomopathogen) Plutella xylostella
Bacillus thuringiensis Cry1B-toxin (entomopathogen) Plutella xylostella