Cross-resistance between a Bacillus thuringiensis Cry toxin and non- BT insecticides in the diamondback moth

A - Papers appearing in refereed journals

Sayyed, A. H., Moores, G. D., Crickmore, N. and Wright, D. J. 2008. Cross-resistance between a Bacillus thuringiensis Cry toxin and non- BT insecticides in the diamondback moth. Pest Management Science. 64 (8), pp. 813-819. https://doi.org/10.1002/ps.1570

AuthorsSayyed, A. H., Moores, G. D., Crickmore, N. and Wright, D. J.
Abstract

BACKGROUND: Bacillus thuringiensis Berliner (Bt) crystal (Cry) toxins arc: expressed in various transgenic crops and are also used as sprays in integrated pest management and organic agricultural systems. The diamondback moth (Plutella xylostella L.) is a major worldwide pest of crucifer crops and one that has readily acquired field resistance to a broad range of insecticides. RESULTS: Selection of a subpopulation of the P. xylostella SERD4 population with the pyrethroid deltamethrin increased resistance to both deltamethrin and Cry1Ac relative to an unselected subpopulation. Selection of a second subpopulation with the Bt toxin Cry1Ac also increased resistance to both Cry1Ac and deltamethrin. A complementation test between the Cry1Ac-selected and deltamethrin-selected subpopulations suggested the presence of a common genetic locus or loci that control resistance to both insecticides. A piperonyl butoxide analogue with potent inhibitory activity against insect esterases significantly increased the toxicity of Cry1Ac and deltamethrin against the respective resistant subpopulations, but showed no such synergism with the unselected subpopulation of SERD4. CONCLUSION: Selection of one resistance phenotype resulted in the simultaneous selection of the other. This phenomenon could be due to a single mechanism acting against both classes of insecticide or to genetically linked, but separate, mechanisms. (c) 2008 Society of Chemical Industry.

KeywordsAgronomy; Entomology
Year of Publication2008
JournalPest Management Science
Journal citation64 (8), pp. 813-819
Digital Object Identifier (DOI)https://doi.org/10.1002/ps.1570
PubMed ID18383197
Open accessPublished as non-open access
Funder project or codeCentre for Sustainable Pest and Disease Management (PDM)
The molecular basis of target site and metabolic insecticide resistance
ISSN1526498X
PublisherWiley

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