title: Within-species variability of the response to 20-hydroxyecdysone in peach-potato aphid (Myzus persicae Sulzer).
abstract: Phytoecdysteroids have been proposed as new tools for controlling crop pests because of their endocrine disruption and deterrent effects on insects and nematodes. There is increasing evidence of variability between taxa in sensitivity to phytoecdysteroids, but the genetic variability of this sensitivity within species is unknown. However, knowledge about this intraspecies variability is required for predicting evolution of the pest's response to new control methods. We assessed the variability of the response of the aphid Myzus persicae Sulzer, a major agricultural pest, to 20-hydroxyecdysone (20E). We determined the number of nymphs produced by six clones of M. persicae exposed to various concentrations of 20E and the capacity of these clones to detect 20E in choice experiments. High concentrations of 20E significantly decreased the number of nymphs produced for two clones and both increases and decreases in the number of offspring were detected at low concentrations. Two clones significantly avoided food with 20E, while one significantly preferred it, suggesting that 20E does not always act as a deterrent in this species. We conclude that genetic variability in the response to 20E exists in natural populations of M. persicae. The consequences of this finding on the sustainability of control methods using 20E are discussed.
authors.affiliation: Biologie des Populations en Interaction, U.M.R. 1112 INRA-UNSA, 400 Route des Chappes. BP167, 06903 Sophia Antipolis cedex, France. malausa@cict.fr
authors.forename: Thibaut
authors.initials: T
authors.lastname: Malausa
authors.forename: Michèle
authors.initials: M
authors.lastname: Salles
authors.forename: Valérie
authors.initials: V
authors.lastname: Marquet
authors.forename: Thomas
authors.initials: T
authors.lastname: Guillemaud
authors.forename: Salah
authors.initials: S
authors.lastname: Alla
authors.forename: Frédéric
authors.initials: F
authors.lastname: Marion-Poll
authors.forename: Laurent
authors.initials: L
authors.lastname: Lapchin
mesh_terms: D000818:Animals; D001042:Aphids / Q000187:drug effects* / Q000235:genetics; D004441:Ecdysterone / Q000494:pharmacology*; D005247:Feeding Behavior / Q000187:drug effects; D005260:Female; D005298:Fertility / Q000187:drug effects; D014644:Genetic Variation; D005838:Genotype; D027861:Prunus / Q000469:parasitology
chemical_list: D004441:Ecdysterone