Journal of Economic Entomology (1998) 91, 1142-1149

T.M. Poland and J.H. Borden (1998)
Semiochemical-induced competition between Dendroctonus rufipennis and two secondary species, Ips tridens and Dryocoetes affaber (Coleoptera : Scolytidae)
Journal of Economic Entomology 91 (5), 1142-1149
Abstract: We investigated the hypothesis that interspecific interactions between the spruce beetle, Dendroctonus rufipennis Kirby, and 2 secondary species, Ips tridens Mannerheim and Dryocoetes affaber Mannerheim, adversely affect spruce beetle progeny production and survival. In field experiments in the British Columbia interior, attack by the secondary species was induced by placing pheromone baits on felled trees just after spruce beetle attack. Spruce beetle attack densities, gallery length per square meter, and progeny densities were significantly reduced in trees that were baited with D. affaber pheromones or D. affaber and I. tridens pheromones. Resource exploitation and synomonal interference with subsequent spruce beetle attacks were the primary competitive mechanisms. No evidence for direct interference was found. Because the impact of the secondary species was not pronounced, semiochemical-induced competitive displacement of the spruce beetle after it has established would not be practical for retarding the development of, or suppressing beetle outbreaks.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Therese M. Poland, John H. Borden

Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation
pheromones/attractants/traps

---

Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Dendroctonus rufipennis		Canada (west)
	Dryocoetes affaber		Canada (west)
	Ips tridens		Canada (west)