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SEMIOCHEMICAL-BASED COMMUNICATION IN INTERSPECIFIC INTERACTIONS BETWEEN IPS PINI (SAY) AND PITYOGENES KNECHTELI (SWAINE) (COLEOPTERA: SCOLYTIDAE) IN LODGEPOLE PINE

Published online by Cambridge University Press:  31 May 2012

Therese M. Poland  and
John H. Borden
Therese M. Poland
Affiliation:
Centre for Pest Management, Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6
John H. Borden
Affiliation:
Centre for Pest Management, Department of Biological Sciences, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6
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Abstract

The pine engraver, Ips pini Say, and Pityogenes knechteli Swaine often co-exist in lodgepole pine, Pinus contoita var. latifolia Engelmann. We tested the hypotheses that P. knechteli produces an attractive pheromone and that the attraction of P. knechteli and I. pint to conspecifics is inhibited by the presence of the other species. Pityogenes knechteli males and females were attracted to bolts infested with conspecific males and to bolts infested with I. pini males; however, there was no significant cross-attraction of I. pini males or females to bolts infested with P. knechteli males. Attraction of P. knechteli and I. pint males and females to bolts infested with conspecific males was not inhibited in the presence of bolts infested with males of the other bark beetle species. Pityogenes knechteli has no potential for competitive displacement of I. pini but may enhance the adverse effect of I. pini on the mountain pine beetle, Dendroctonus ponderosae Hopkins.

Résumé

Les scolytes Ips pini Say et Pityogenes knechteli Swaine cohabitent souvent dans des Pins de Murray Pinus conforta var. latifolia Engelmann. Nous avons éprouvé l’hypothèse selon laquelle P. knechteli produit une phéromone d’attraction et selon laquelle, chez P. knechteli aussi bien que chez I. pini, l’attraction entre les individus de la même espèce est inhibée par la présence de l’autre espèce. Les mâles et les femelles de P. knechteli étaient attirés vers des billes infestées de mâles de l’une ou l’autre espèce; cependant, les billes infestées de mâles de P. knechteli n’avaient pas d’attirance significative pour les mâles ou les femelles d’I. pini. L’attirance des mâles et des femelles des deux espèces pour les billes infestées de mâles de leur propre espèce n’était pas inhibée en présence de billes infestées par des mâles de l’autre espèce. Pityogenes knechteli n’a donc pas la capacité d’exclure I. pini par compétition, mais peut augmenter l’effet néfaste d’I. pini sur le Dendroctone du Pin ponderosa, Dendroctonus ponderosae Hopkins.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 126 , Issue 2 , April 1994 , pp. 269 - 276
Copyright
Copyright © Entomological Society of Canada 1994

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