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Cabbage seedpod weevil (Coleoptera: Curculionidae): new pest of canola in northeastern North America

Published online by Cambridge University Press:  31 May 2012

Jacques Brodeur ,
Luc-André Leclerc ,
Marc Fournier  and
Michèle Roy
Jacques Brodeur*
Affiliation:
Centre de Recherche en Horticulture, Département de phytologie, Université Laval, Sainte-Foy, Quebec, Canada G1K 7P4
Luc-André Leclerc
Affiliation:
Centre de Recherche en Horticulture, Département de phytologie, Université Laval, Sainte-Foy, Quebec, Canada G1K 7P4
Marc Fournier
Affiliation:
Centre de Recherche en Horticulture, Département de phytologie, Université Laval, Sainte-Foy, Quebec, Canada G1K 7P4
Michèle Roy
Affiliation:
Direction des services technologiques, Ministère de l'Agriculture, des Pêcheries et de l'Alimentation du Québec, 2700 rue Einstein, Sainte-Foy, Quebec, Canada G1P 3W8
*
1 Author to whom all correspondence should be addressed (E-mail: [email protected]).
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Extract

The cabbage seedpod weevil, Ceutorhynchus obstrictus (Marsham) [= C. assimilis (Paykull)] (Colonnelli 1993), is a univoltine species native to Europe that feeds on canola and other oilseed cruciferous plants. The adult overwinters in debris and soil outside fields and colonizes canola at the blooming stage (Dosdall et al. 2001). Eggs are laid singly into the immature pods and each larva consumes five to seven seeds before cutting a hole in the pod to wriggle out and pupate in the soil (Dmoch 1965). Yield losses are difficult to assess because the plant compensates for bud and pod injuries caused by insects or pathogens (Lamb 1989). Nevertheless, pod feeding by larvae causes much damage, as canola yields can be reduced from 15 to 35% (Homan and McCaffrey 1993). Feeding by adults can also be significant, as it can reduce oil content, seed weight, and seed germination (Buntin et al. 1995).

Type
Articles
Information
The Canadian Entomologist , Volume 133 , Issue 5 , October 2001 , pp. 709 - 711
Copyright
Copyright © Entomological Society of Canada 2001

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References

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