Journal Article

Genetics of Response to Permethrin in Unexposed Diamondback Moth (Lepidoptera: Plutellidae) Populations

Graham Head, Casey W. Hoy and Franklin R. Hall

in Annals of the Entomological Society of America

Volume 91, issue 2, pages 217-221
Published in print March 1998 | ISSN: 0013-8746
Published online October 2014 | e-ISSN: 1938-2901 | DOI:
Genetics of Response to Permethrin in Unexposed Diamondback Moth (Lepidoptera: Plutellidae) Populations

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Insecticide resistance is widespread, yet little is known about the initial stages of its evolution. We carried out a survey of permethrin (a pyrethroid) tolerance in populations of the diamondback moth, Plutella xylostella L., that had not previously encountered pyrethroids. Six replicate lines were formed from the most susceptible population. Levels of genetic variation and heritabilities of behavioral and physiological responses to permethrin, and the genetic correlation between these responses, were estimated for each line. Unexposed populations consistently had lower permethrin tolerance and tended to have less variation in permethrin tolerance than exposed populations. In the lines formed from the most susceptible population, levels of genetic variation for permethrin response, heritabilities, and genetic correlations generally were not significant. Heritabilities for behavioral response were no higher than those for tolerance, contrary to some proposed models of how resistance develops, and the 2 characters appeared to have separate genetic bases. Sampling variation produced some genetic differences among lines. Such sampling effects also may be important in the founding of new field populations and in the evolution of resistance in these populations.

Keywords: Plutella xylostella; insecticide resistance; quantitative genetics; pyrethroid; permethrin

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