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Evaluation of foliar and seed treatments for control of the cabbage seedpod weevil (Coleoptera: Curculionidae) in canola1

  • H.A. Cárcamo (a1), L.M. Dosdall (a2), D. Johnson (a3) and O. Olfert (a4)


Caged assays and field tests were used to evaluate the effectiveness of organophosphorus, pyrethroid, neonicotinoid, and biologically derived insecticides for reducing populations of the cabbage seedpod weevil, Ceutorhynchus obstrictus (Marsham), a new pest of canola in Canada. Complete mortality of caged weevils occurred 48 h after treatment with disulfoton, deltamethrin, carbofuran, oxydemeton-methyl, and chlorpyrifos. Under field conditions, using plots or large strips in commercial fields from 1998 to 2001, only deltamethrin and cyhalothrin-lambda (both pyrethroids) consistently reduced weevil densities, even at high population levels. Chlorpyrifos also significantly reduced weevil numbers and damage in some years, but results were variable and efficacy was too low to manage weevils under outbreak densities. Other insecticides such as spinosad provided moderate weevil control and may have a role in weevil management depending on their effect on beneficial insects relative to more efficacious insecticides. Treatment of canola seed with imidacloprid, lindane, or acetamiprid did not reduce weevil damage. Further research is needed to establish economic thresholds for C. obstrictus in canola, to assess the effect of insecticides on nontarget natural enemies of canola insect pests, and to assess the potential for integration of chemical agents with biological and cultural control strategies.

Des bioessais en cages et des tests sur le terrain nous ont permis d'évaluer l'efficacité d'insecticides organophosphorés, pyréthrinoïdes et néonicotinoïdes, ainsi que des insecticides d'origine biologique, pour la réduction des populations du charançon des siliques de colza, Ceutorhynchus obstrictus (Marsham), un nouveau ravageur du canola au Canada. Un traitement au disulfoton, à la deltaméthrine, au carbofuran, à l'oxydéméthon-méthyle ou au chlorpyrifos entraîne une mortalité totale des charançons en cages en 48 h. Dans des parcelles ou des bandes dans des champs commerciaux en conditions naturelles de 1998 à 2001, seules la deltaméthrine et la cyalothrine-lambda (toutes deux des pyréthrinoïdes) réduisent les densités de charançons de façon soutenue, même lorsque les populations sont abondantes. Certaines années, le chlorpyrifos réduit aussi significativement les nombres de charançons et les dommages aux récoltes, mais ses effets sont variables et son efficacité trop faible pour le contrôle des charançons aux densités de niveau épidémique. D'autres insecticides, tels que le spinosad, procurent un niveau de contrôle moyen et peuvent avoir un rôle dans la lutte contre les charançons, tout dépendant de leur impact sur les insectes bénéfiques par comparaison à celui d'autres insecticides plus efficaces. Les traitements des graines de canola à l'imidaclopride, au lindane ou à l'acétamipride ne réduisent pas les dommages causés par les charançons. Il faudra faire des recherches supplémentaires pour établir les seuils économiques de densité de C. obstrictus dans les cultures de canola, pour évaluer l'impact des insecticides sur les ennemis naturels non ciblés des insectes ravageurs du canola et déterminer la possibilité d'intégrer les agents chimiques à des stratégies impliquant un contrôle biologique et des méthodes particulières de culture.

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Lethbridge Research Centre contribution No. (387) 04038.



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