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Larval phenologies and parasitoids of two seed-feeding weevils associated with hoary cress and shepherd's purse (Brassicaceae) in Europe

Published online by Cambridge University Press:  03 January 2012

Franck J. Muller
Affiliation:
CABI Europe-Switzerland, Rue des Grillons 1, 2800 Delémont, Switzerland
Lloyd M. Dosdall*
Affiliation:
Department of Agricultural, Food and Nutritional Science, University of Alberta, 4-10 Agriculture-Forestry Centre, Edmonton, Alberta, Canada T6G 2P5
Peter G. Mason
Affiliation:
Agriculture and Agri-Food Canada, Research Centre, 960 Carling Avenue, Ottawa, Ontario, Canada K1A 0C6
Ulrich Kuhlmann
Affiliation:
CABI Europe-Switzerland, Rue des Grillons 1, 2800 Delémont, Switzerland
*
1Corresponding author (e-mail: Lloyd.Dosdall@ales.ualberta.ca).

Abstract

In Europe, Ceutorhynchus turbatus Schultze and Ceutorhynchus typhae (Herbst) (Coleoptera: Curculionidae) feed on seeds from hoary cress and shepherd's purse (Cardaria draba (L.) Desv. and Capsella bursa-pastoris (L.) Medik.); both plants are invasive in North America. In North America, C. turbatus is a candidate for biological control of hoary cress, C. typhae is adventive, and both are sympatric with cabbage seedpod weevil (Ceutorhynchus obstrictus (Marsham)), an invasive alien pest of canola (Brassica napus L. and Brassica rapa L., Brassicaceae). We investigated host associations among C. turbatus, C. typhae, and their parasitoids in Europe. Of particular interest was host specificity of Trichomalus perfectus (Walker) and Mesopolobus morys (Walker) (Hymenoptera: Pteromalidae), candidates for biological control of C. obstrictus in North America. We found no evidence that T. perfectus attacks C. turbatus or C. typhae; however, M. morys was the most common parasitoid associated with C. turbatus.

Résumé

En Europe, Ceutorhynchus turbatus Schultze et Ceutorhynchus typhae (Herbst) (Coleoptera : Curculionidae) se nourrissent des graines de la cardaire drave et de la capselle bourse-à-pasteur (Cardaria draba (L.) Desv. et Capsella bursa-pastoris (L.) Medik.), deux plantes envahissantes en Amérique du Nord. En Amérique du Nord, C. turbatus est un candidat pour la lutte biologique contre la cardaire drave, C. typhae est adventice et les deux espèces sont sympatriques avec le charançon de la graine du chou (Ceutorhynchus obstrictus (Marsham)), un ravageur exotique envahissant du colza (Brassica napus L. et Brassica rapa L., Brassicaceae). Nous avons étudié les associations d'hôtes entre C. turbatus, C. typhae et leurs parasitoïdes en Europe. La spécificité d'hôte de Trichomalus perfectus (Walker) et celle de Mesopolobus morys (Walker) (Hymenoptera : Pteromalidae) sont particulièrement intéressantes et ces espèces sont des candidats pour la lutte biologique contre C. obstrictus en Amérique du Nord. Nous n'avons aucune indication que T. perfectus attaque C. turbatus ou C. typhae; cependant, M. morys est le parasitoïde le plus communément associé à C. turbatus.

[Traduit par la Rédaction]

Type
Biodiversity & Evolution
Copyright
Copyright © Entomological Society of Canada 2011

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