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EFFECT OF THE LIVING HOST TREE (PICEA) ON THE RESPONSE OF DENDROCTONUS RUFIPENNIS (COLEOPTERA: SCOLYTIDAE) AND A PREDATOR THANASIMUS UNDATULUS (COLEOPTERA: CLERIDAE) TO FRONTALIN AND SEUDENOL

Published online by Cambridge University Press:  31 May 2012

E. D. A. Dyer  and
P. M. Hall
E. D. A. Dyer
Affiliation:
Canadian Forestry Service, Pacific Forest Research Centre, Victoria, B.C. V8Z 1M5
P. M. Hall
Affiliation:
Canadian Forestry Service, Pacific Forest Research Centre, Victoria, B.C. V8Z 1M5
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Abstract

Two synthetic pheromones, frontalin and seudenol, were tested on living host (Picea) trees and on non-host (Abies) trees to determine their relative attractiveness to the spruce beetle (Dendroctonus rufipennis) and a clerid predator (Thanasimus undatulus). On host trees, frontalin attracted significantly more spruce beetles and induced significantly more attacks on the trees than did seudenol. On non-host trees, more beetles and a higher male ratio were attracted to seudenol than to frontalin. Frontalin has a positive effect on the behavior of female spruce-beetle attack, whereas seudenol has not. The resulting natural secondary attraction of attacking female beetles creates strong aggregation of both sexes of spruce beetles on host trees (Picea) baited with frontalin, but not on host trees baited with seudenol or on non-host trees (Abies). The clerid predator (T. undatulus) was attracted to frontalin in significatnly larger numbers than to seudenol.

Résumé

Deux phérormones synthétiques du Puceron de l’Épinette, la frontaline et le seudenol, ont été testées sur des arbres-hôtes vivants (Picea) et sur des arbres non-hôtes (Abies) pour déterminer leur attractivité relative pour le Puceron de l’Épinette et un autre cléridé prédateur. Sur les arbres-hôtes, la frontaline a attiré significativement plus de pucerons de l’Épinette et a induit significativement plus d’attaques aux arbres que ne l’a fait le seudenol. Sur les arbres témoins, plus de pucerons et un plus grand pourcentage de mâles ont été attirés par le seudenol que par la frontaline. La frontaline agit positivement sur l’attaque des femelles du Puceron de l’Épinette tandis que l’effet du seudenol est nul. L’attraction secondaire qui en résulte chez la femelle qui attaque crée un amoncellement des deux sexes du Puceron de l’Épinette sur les arbres-hôtes appâtés avec la frontaline et non pas sur ceux appâtés au seudenol ou sur les témoins. Le cléridé prédateur a été attiré par la frontaline en nombres significativement plus grands que par le seudenol.

Type
Articles
Information
The Canadian Entomologist , Volume 112 , Issue 2 , 01 February 1980 , pp. 167 - 171
Copyright
Copyright © Entomological Society of Canada 1980

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