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ATTRACTIVENESS OF LOGS CONTAINING FEMALE SPRUCE BEETLES, DENDROCTONUS OBESUS (COLEOPTERA: SCOLYTIDAE)

Published online by Cambridge University Press:  31 May 2012

E. D. A. Dyer  and
D. W. Taylor
E. D. A. Dyer
Affiliation:
Forest Research Laboratory, Department of Forestry and Rural Development, Victoria, British Columbia
D. W. Taylor
Affiliation:
Forest Research Laboratory, Department of Forestry and Rural Development, Victoria, British Columbia
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Abstract

Field studies were carried out on effect of attack by unmated spruce beetles, Dendroctonus obesus (Mann.) on log attractiveness. Test logs were screen-covered or sprayed with insecticide. Trays beneath logs, with glass-barrier traps beside them, were used to measure response of beetles from natural populations.

About 89% of the beetles attracted at six replicate sites were taken at logs containing introduced females. Males always predominated in responses to these logs. After the initial flight, about equal numbers of each sex responded to logs without introduced females. Response to the latter dropped to a low level after the initial flight, but beetles continued to respond well to logs attacked by females throughout the flight period. Use of increased attractiveness to logs following introduction of female beetles shows promise as a means of studying, directing, or controlling infestations of the spruce beetle.

Résumé

Des expériences ont été effectuées en forêt afin de déterminer l’attrait exercé sur le Dendroctone de l’Epinette de Sitka (Dendroctonus obesus (Mannerheim)) par les billes contenant des femelles vierges de cet insecte. Les billes d’essai furent couvertes d’un grillage ou arrosées d’insecticide. Sous les billes, des cuvettes, flanquées de pièges munis d’un portillon de verre servaient à mesurer la réaction des Dendroctones provenant de populations naturelles.

Dans les six lieux examinés, les billes où des femelles avaient déjà été introduites contenaient environ 89 p. 100 de tous les insectes attrapés et, parmi ceux-ci, les mâles y étaient toujours plus nombreux que les femelles. Dans les billes-témoins, par contre, à peu près le même nombre de mâles et de femelles était présent après le premier vol. Là, plus tard, il y avait une diminution du nombre d’insectes attrapés, alors que dans les billes où les femelles avaient déjà été introduites, la récolte était bonne pendant toute la période du vol. Le fait que les billes déjà attaquées par les femelles attirent plus fortement le Dendroctone de l’Epinette de Sitka se révélera utile pour ceux qui voudront étudier, contrôler et réprimer les infestations de cet insecte.

Type
Articles
Information
The Canadian Entomologist , Volume 100 , Issue 7 , July 1968 , pp. 769 - 776
Copyright
Copyright © Entomological Society of Canada 1968

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