Results
Title

Deltamethrin resistance in the codling moth (Lepidoptera: Tortricidae): inheritance and number of genes involved.

Authors

Bouvier, Jean-Charles; Buès, Robert; Boivin, Thomas; Boudinhon, Liliane; Beslay, Dominique; Sauphanor, Benoît

Abstract

The inheritance of deltamethrin resistance in Cydia pomonella (L.) has been investigated by crossing a resistant (Rv) and a susceptible (Sv) strain, derived from a population collected in south-eastern France in 1995. Deltamethrin resistance was suspected to be under the control of a kdr-type allele and an enhanced mixed-function oxidase (mfo). F1 and F2 progenies were therefore tested through dose–response and enzyme assays. Dose–response relationships indicated that resistance was inherited as an autosomal incompletely recessive (D=-0.199) character, involving at least two genes. Enzyme measures suggested the contribution of 1.2 genes to the expression of mfo, with incomplete dominance (D=0.460). Our results support the hypothesis of a polygenic response to deltamethrin selection in the Rv strain, including a major kdr-type allele with a minor effect of mfos. In the light of these findings, we consider the resistance in codling moth populations in south-eastern France as a product of an adaptive sequential selection process, occurring through the sequential addition of resistance genes.

Subjects

SOUTHEASTERN France; CODLING moth; OXIDASES; DOSE-response relationship in biochemistry

Publication

Heredity, 2001, Vol 87, Issue 4, p456

ISSN

0018-067X

Publication type

Academic Journal

DOI

10.1046/j.1365-2540.2001.00928.x