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THE DISTRIBUTION OF RHYZOPERTHA DOMINICA (F.) IN WESTERN CANADA1

Published online by Cambridge University Press:  31 May 2012

P.G. Fields ,
J. Van Loon ,
M.G. Dolinski ,
J.L. Harris  and
W.E. Burkholder
P.G. Fields
Affiliation:
Agriculture Canada Research Station, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
J. Van Loon
Affiliation:
Canadian Grain Commission, 800–269 Main Street, Winnipeg, Manitoba, Canada R3C 1B2
M.G. Dolinski
Affiliation:
Alberta Agriculture, Crop Protection Branch, 7000–113 Street, Edmonton, Alberta, Canada T6H 5T6
J.L. Harris
Affiliation:
Saskatchewan Agriculture, Soils and Crop Branch, 3085 Albert Street, Regina, Saskatchewan, Canada S4S 0B1
W.E. Burkholder
Affiliation:
Department of Entomology, United States Department of Agriculture, Agriculture Research Service, University of Wisconsin, Madison, Wisconsin, USA 53707
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Abstract

Rhyzopertha dominica (F.) (lesser grain borer, Coleoptera: Bostrichidae) is a major pest of stored grain in the United States, Australia, and most other warm regions of the world. It has rarely been detected in Canadian grain, until recently. To determine the distribution of/R. dominica in western Canada, Lindgren multiple-funnel traps baited with R. dominica aggregation pheromones were placed near grain elevators, feed mills, and farms. Rhyzopertha dominica was found flying outside grain-handling facilities in all Prairie Provinces in 1990 and 1991, with thousands collected in Manitoba, hundreds in Alberta, and less than 100 in Saskatchewan. A few R. dominica were caught in Vancouver and Thunder Bay. None were caught in the traps placed beside two grain elevators in southern Ontario. In Alberta and Saskatchewan, the locations with R. dominica were mainly in the south. In Manitoba, the total number of R. dominica caught at each location was higher in the south than in the north. Rhyzopertha dominica were caught as early as 15 May and as late as 18 September, with the peak numbers for a given location occurring between July and September. No difference in the total number of R. dominica caught per year was found among farms, feed mills, or grain elevators in 1990 or 1991. Sampling of stored grain on three farms showed that two of the eight bins sampled had R. dominica. The possible origins of the R. dominica (importation of infested grain, wind-borne migration from the United States, or an established Canadian population) are discussed.

Résumé

Rhyzopertha dominica (F.)(Ie Perceur des céréales, Coleoptera : Bostrichidae) est une espèce nuisible de grande importance qui s’attaque aux céréales entreposées aux États-Unis, en Australie et dans la plupart des régions chaudes du globe. Ce n’est que récemment qu’elle a été trouvée dans les céréales au Canada. Des pièges à entonnoirs multiples de type Lindgren appâtés avec la phéromone d’agrégation de R. dominica placés près de silos à céréales, de minoteries et de fermes ont permis de déterminer la répartition géographique de l’espèce dans l’Ouest canadien. L’insecte a été observé au vol près des lieux de manutention des céréales dans toutes les provinces des Prairies en 1990 et en 1991; le nombre d’individus récoltés variait de milliers au Manitoba, à des centaines en Alberta, à moins de 100 en Saskatchewan. Quelques individus ont été capturés à Thunder Bay et à Vancouver. Aucun n’a été trouvé dans des pièges placés près de deux silos dans le sud de l’Ontario. En Alberta et en Saskatchewan, les sites de récolte étaient principalement situés dans le sud de la province. Au Manitoba, plus d’individus ont été capturés dans les sites du sud de la province. Les premiers individus ont été observés dès le 15 mai et les récoltes se sont échelonnées jusqu’au 18 septembre, avec un maximum de captures entre juillet et septembre, selon les endroits. En 1990 et 1991, il n’y avait pas de différence entre les récoltes annuelles sur les fermes, les minoteries et les silos. Un échantillonnage des céréales entreposées sur trois fermes a révélé l’existence de R. dominica dans deux des huit coffres à céréales examinés. L’origine possible de l’insecte (importation de céréales contaminées, migration aérienne depuis les Etats-Unis, existence d’une population déjà établie au Canada) fait l’objet d’une discussion.

[Traduit par la rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 125 , Issue 2 , April 1993 , pp. 317 - 328
Copyright
Copyright © Entomological Society of Canada 1993

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