Insecticide resistance may enhance the response to a host-plant volatile kairomone for the codling moth, <Emphasis Type="Italic">Cydia pomonella</Emphasis> (L.) |
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Authors: | Benoît Sauphanor Pierre Franck Thérèse Lasnier Jean-François Toubon Dominique Beslay Thomas Boivin Jean-Charles Bouvier Michel Renou |
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Institution: | (1) INRA–PSH, Ecologie de la Production Intégrée, Site Agroparc, 84914 Avignon Cedex 9, France;(2) INRA UMR 1272 Physiologie de l’Insecte: Signalisation et Communication, Route de Saint Cyr, 78026 Versailles Cedex, France |
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Abstract: | The behavioral and electroantennographic responses of Cydia pomonella (L.) to the ripe pear volatile ethyl (2E,4Z)-2,4-decadienoate (Et-E,Z-DD), were compared in insecticide-susceptible and -resistant populations originating from southern France. A dose–response
relationship to this kairomonal attractant was established for antennal activity and did not reveal differences between susceptible
and resistant strains. Conversely, males of the laboratory strains expressing metabolic cytochrome P450-dependent mixed-function
oxidases (mfo)] or physiological (kdr-type mutation of the sodium-channel gene) resistance mechanisms exhibited a significantly
higher response to Et-E,Z-DD than those of the susceptible strain in a wind tunnel experiment. No response of the females to this kairomone could be
obtained in our wind-tunnel conditions. In apple orchards, mfo-resistant male moths were captured at significantly higher
rates in kairomone-baited traps than in traps baited with the sex pheromone of C. pomonella. Such a differential phenomenon was not verified for the kdr-resistant insects, which exhibited a similar response to both
the sex pheromone and the kairomonal attractant in apple orchards. Considering the widespread distribution of metabolic resistance
in European populations of C. pomonella and the enhanced behavioral response to Et-E,Z-DD in resistant moths, the development of control measures based on this kairomonal compound would be of great interest for
the management of insecticide resistance in this species. |
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Keywords: | Olfaction Plant volatile compound Pheromone Attraction Pleiotropy |
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