Pyrethroid resistance in the tomato red spider mite, Tetranychus evansi, is associated with mutation of the para- type sodium channel

A - Papers appearing in refereed journals

Nyoni, B. N., Gorman, K. J., Mzilahowa, T., Williamson, M. S., Navajas, M., Field, L. M. and Bass, C. 2011. Pyrethroid resistance in the tomato red spider mite, Tetranychus evansi, is associated with mutation of the para- type sodium channel. Pest Management Science. 67 (8), pp. 891-897. https://doi.org/10.1002/ps.2145

AuthorsNyoni, B. N., Gorman, K. J., Mzilahowa, T., Williamson, M. S., Navajas, M., Field, L. M. and Bass, C.
Abstract

BACKGROUND: The tomato red spider mite, Tetranychus evansi (Baker and Pritchard), is a serious pest of solanaceous crops in many African countries. In this study an investigation has been conducted to establish whether mutation of the para-type sodium channel underlies pyrethroid resistance in T. evansi strains collected in Southern Malawi. RESULTS: Two T. evansi strains from Malawi showed tolerance to the organophosphate chlorpyrifos and resistance (20-40-fold) to the pyrethroid bifenthrin, but were susceptible to two contemporary acaricides (abamectin and fenpyroximate) in insecticide bioassays. Cloning of a 3.1 kb fragment (domains IIS5 to IVS5) of the T. evansi para gene from pyrethroid-resistant and pyrethroid-susceptible strains revealed a single non-synonymousmutation in the resistant strains that results in an amino acid substitution (M918T) within the domain II region of the channel. Although novel to mites, this mutation confers high levels of resistance to pyrethroids in several insect species where it has always been associated with another mutation (L1014F). This is the first report of the M918T mutation in the absence of L1014F in any arthropod species. Diagnostic tools were developed that allow sensitive detection of this mutation in individual mites. CONCLUSION: This is the first study of pyrethroid resistance in T. evansi and provides contemporary information for resistance management of this pest in Southern Malawi. (C) 2011 Society of Chemical Industry

KeywordsAgronomy; Entomology
Year of Publication2011
JournalPest Management Science
Journal citation67 (8), pp. 891-897
Digital Object Identifier (DOI)https://doi.org/10.1002/ps.2145
PubMed ID21432985
Open accessPublished as non-open access
FunderRothamsted International
Biotechnology and Biological Sciences Research Council
Funder project or codeCentre for Sustainable Pest and Disease Management (PDM)
BBSRC Institute Career Path Fellowship: A genomic approach to understanding insecticide resistance in crop pests
A genomic approach to understanding insecticide resistance in crop pests
Output statusPublished
Publication dates
Online22 Mar 2011
Publication process dates
Accepted29 Nov 2010
PublisherWiley
ISSN1526-498X

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