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Mites affect plum curculio (Coleoptera: Curculionidae) behavioural responses to attractive volatiles

Published online by Cambridge University Press:  03 January 2013

Virginia Hock ,
Gérald Chouinard ,
Éric Lucas  and
Daniel Cormier
Virginia Hock*
Affiliation:
Institut de recherche et de développement en agroenvironnement (IRDA), Laboratoire de Production Fruitière Intégrée 335, chemin des Vingt-Cinq Est Saint-Bruno-de-Montarville, Québec, J3V 0G7 Canada; and Université du Québec à Montréal (UQAM), Département des sciences biologiques, Laboratoire de lutte biologique, Case postale 8888, succursale Centre-ville, Montréal, Québec, H3C 3P8 Canada
Gérald Chouinard
Affiliation:
Institut de recherche et de développement en agroenvironnement (IRDA), Laboratoire de Production Fruitière Intégrée 335, chemin des Vingt-Cinq Est Saint-Bruno-de-Montarville, Québec, J3V 0G7 Canada
Éric Lucas
Affiliation:
Université du Québec à Montréal (UQAM), Département des sciences biologiques, Laboratoire de lutte biologique, Case postale 8888, succursale Centre-ville, Montréal, Québec, H3C 3P8 Canada
Daniel Cormier
Affiliation:
Institut de recherche et de développement en agroenvironnement (IRDA), Laboratoire de Production Fruitière Intégrée 335, chemin des Vingt-Cinq Est Saint-Bruno-de-Montarville, Québec, J3V 0G7 Canada
*
1Corresponding author (e-mail: [email protected]).
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Abstract

An infestation of Histiostoma Kramer sp. mites (Acari: Histiostomatidae) occurred in rearing colonies of the univoltine strain of plum curculio (PC), Conotrachelus nenuphar (Herbst) (Coleoptera: Curculionidae), established in 2010 in southern Québec, Canada. Tests conducted in a two-choice still-air vertical olfactometer with mite-infested and noninfested PC revealed that the number of beetles responding by walking towards normally attractive synthetic and natural odours was significantly lower for those infested with mites. Those mite-infested curculios that did discriminate between test odours and odour-free air all responded positively to the test volatiles, similar to the behaviour of noninfested insects. This indicates that mites affect PC ability to physically move towards attractive volatiles but not odour preference.

Résumé

Une infestation par les acariens phorétiques du genre Histiostoma Kramer (Acari: Histiostomatidae) s'est produite dans l’élevage de la souche univoltine du nord du charançon de la prune Conotrachelus nenuphar (Herbst) (Coleoptera: Curculionidae) établie en 2010 dans le sud du Québec, Canada. Des tests ont été effectués à l'aide d'un olfactomètre vertical à deux-voies, sans pression d'air. Les charançons infestés et non-infestés ont été testés et ont révélé un effet des acariens sur la réponse olfactométrique de cet insecte. Pour les odeurs synthétiques et naturelles attractives aux charançons, significativement moins de charançons infestés par des acariens ont répondu aux odeurs que de charançons non-infestés. Pour cette raison, l'attraction des charançons infestés par des acariens vers les sources des odeurs était difficile à établir. Cependant, tous les charançons infestés ayant répondu ont réagit positivement aux volatiles testés, d'une façon similaire aux insectes non-infestés. Ceci indique que les acariens affectent la capacité des charançons à répondre aux volatiles attractifs mais n'affectent pas leurs préférences.

Type
Behaviour & Ecology – NOTE
Information
The Canadian Entomologist , Volume 145 , Issue 1 , February 2013 , pp. 82 - 87
Copyright
Copyright © Entomological Society of Canada 2013

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