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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 species 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.
Document Type: Research Article
Publication date: October 1, 1998
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Journal of Economic Entomology is published bimonthly in February, April, June, August, October, and December. The journal publishes articles on the economic significance of insects and is divided into the following sections: apiculture & social insects; arthropods in relation to plant disease; forum; insecticide resistance and resistance management; ecotoxicology; biological and microbial control; ecology and behavior; sampling and biostatistics; household and structural insects; medical entomology; molecular entomology; veterinary entomology; forest entomology; horticultural entomology; field and forage crops, and small grains; stored-product; commodity treatment and quarantine entomology; and plant resistance. In addition to research papers, Journal of Economic Entomology publishes Letters to the Editor, interpretive articles in a Forum section, Short Communications, Rapid Communications, and Book Reviews.