Journal of Economic Entomology (2004) 97, 1049-1057

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Herbert A.A. Siqueira, Daniel Moellenbeck, Terence Spencer and Blair D. Siegfried (2004)
Cross-resistance of Cry1Ab-selected Ostrinia nubilalis (Lepidoptera: Crambidae) to Bacillus thuringiensis delta-endotoxins
Journal of Economic Entomology 97 (3), 1049-1057
Abstract: Corn plants expressing the toxin from Bacillus thuringiensis (Berliner) have proven to be effective in controlling lepidopteran pests such as the European corn borer, Ostrinia nubilalis (Hübner) (Lepidoptera: Crambidae). Several Bt toxins are being tested and incorporated into crop genomes, although tests for cross-resistance among different toxins have been limited by a lack of resistant colonies. Four different colonies of O. nubilalis selected with full-length Cry1Ab incorporated into artificial diet developed significant levels of resistance (2.0- to 10-fold) within 10 generations. Additionally, selection with Cry1Ab resulted in decreased susceptibility to a number of other toxins to which the selected colonies were not previously exposed. Significantly, levels of resistance were highest to Cry1Ac with resistance ratios up to 51.0-fold. Low levels (less than five-fold) of cross-resistance were detected with Cry1F. In contrast, Cry9C susceptibility was unaffected by selection with Cry1Ab. These results indicate that the availability of multiple toxins could improve resistance management strategies, provided cross-resistance among toxins is not a factor.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Herbert A.A. Siqueira, Blair D. Siegfried

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.

Ostrinia nubilalis
Bacillus thuringiensis genes in crops (entomopathogen) Ostrinia nubilalis
Bacillus thuringiensis Cry1A-toxin (entomopathogen) Ostrinia nubilalis
Bacillus thuringiensis Cry1F-toxin (entomopathogen) Ostrinia nubilalis
Bacillus thuringiensis Cry9C-toxin (entomopathogen) Ostrinia nubilalis