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Sampling Tribolium confusum and Tribolium castaneum in mill and laboratory settings: differences between strains and species

Published online by Cambridge University Press:  07 September 2012

Karen J. Hawkin
Affiliation:
Department of Entomology, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
Dean M. Stanbridge
Affiliation:
Direct Line Sales and Supplies Corporation, Suite 218, 4305 Fairview Street, Burlington, Ontario, Canada L7L 6E8
Paul G. Fields*
Affiliation:
Cereal Research Centre, Agriculture and Agri-Food Canada, 195 Dafoe Road, Winnipeg, Manitoba, Canada R3T 2M9
*
1Corresponding author (e-mail: paul.fields@agr.gc.ca).

Abstract

The efficacy of pitfall traps baited with pheromone and cereal oil in capturing Tribolium confusum Jacquelin du Val and T. castaneum (Herbst) (Coleoptera: Tenebrionidae) was low (trap catch) in mill and simulated warehouse settings. In a simulated warehouse experiment, strains of Tribolium Macleay recently taken from mills were caught 24% less often in traps than were laboratory strains, and T. confusum was caught 40% less often than T. castaneum. Both species were found together in all flour samples taken from a Canadian flour mill. A comparison of the species ratio in flour samples with that found in traps revealed that T. confusum was caught less often in traps than was T. castaneum. In flour, T. castaneum burrowed more than did T. confusum, and there were differences in burrowing behaviour between the four T. castaneum strains. Mills infested with T. confusum may have higher levels of infestation than was previously thought, indicating that further research into beetle behaviour in mills is needed.

Résumé

Les pièges à fosse pour Tribolium confusum Jacquelin du Val et T. castaneum (Herbst) (Coleoptera: Tenebrionidae) appâtés avec de la phéromone et de l'huile de céréales étaient de faible efficacité (insectes capturés dans les pièges) dans un moulin à farine et un entrepôt expérimental. Dans un essai d'entrepôt expérimental, des souches de Tribolium Macleay prélevés pris récemment dans des moulins à farine ont été capturés dans les pièges 24% moins souvent que les souches de laboratoire, et le T. confusum a été capturé dans les pièges 40% moins souvent que le T. castaneum. Les deux espèces ont été trouvés ensemble dans tous les échantillons de farine prélevés dans un moulin à farine canadien. Le rapport entre les deux espèces dans les échantillons de farine a été comparé à celui dans les pièges, révélant que T. confusum a été pris moins souvent que T. castaneum dans les pièges. Dans la farine T. castaneum creusait plus que T. confusum, et il y avait des différences significatives dans le comportement de creusage dans la farine entre les quarte souches de T. castaneum. Le T. castaneum a creusé plus que T. confusum, et il y avait des différences entre les quatre souches de T. castaneum. Les moulins envahis par le T. confusum pourraient en avoir plus que l'on croyait auparavant, de sorte que des recherches supplémentaires sur le comportement de ces espèces s'avère nécessaire.

Type
Research Article
Copyright
Copyright © Entomological Society of Canada 2011

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