Poor survival on an artificial diet of two genotypes of the aphid Myzus persicae: a fitness cost of insecticide resistance?

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Van Emden, H. F., Foster, S. P. and Field, L. M. 2014. Poor survival on an artificial diet of two genotypes of the aphid Myzus persicae: a fitness cost of insecticide resistance? Agricultural and Forest Entomology. 16 (4), pp. 335-340.

AuthorsVan Emden, H. F., Foster, S. P. and Field, L. M.
Abstract

A fully susceptible genotype (4106A) of Myzus persicae survived the longest on an artificial diet and, in several of the eight replicates, monitoring was terminated when the culture was still thriving. A genotype with elevated carboxylesterase FE4 at the R-3 level (800F) had a mean survival of only 98.13days, whereas 794J, which combines R-3 E4 carboxylesterase with target-site resistance (knockdown resistance), survived for the even shorter mean time of 84.38days. The poorer survival of the two genotypes with extremely elevated carboxylesterase-resistance was not the result of a reluctance to transfer to new diet at each diet change. Although available for only two replicates, a revertant clone of 794J (794Jrev), which has the same genotype as 794J but the amplified E4 genes are not expressed leading to a fully susceptible phenotype, did not appear to survive any better than this clone. This suggests that the poor survival on an artificial diet of the extreme-carboxylesterase genotypes is not the result of the cost of over-producing the enzyme. The frequency of insecticide-resistant genotypes is low in the population until insecticide is applied, indicating that they have reduced fitness, although this does not necessarily reflect a direct cost of expressing the resistance mechanism.

KeywordsEntomology
Year of Publication2014
JournalAgricultural and Forest Entomology
Journal citation16 (4), pp. 335-340
Digital Object Identifier (DOI)doi:10.1111/afe.12063
Open accessPublished as non-open access
FunderBiotechnology and Biological Sciences Research Council
Funder project or codeDelivering Sustainable Systems (SS) [ISPG]
ISSN14619555
PublisherWiley
Grant IDBBS/E/C/00005193

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