Environmental Entomology (1987) 16, 390-399

Richard O. Flamm, Terence L. Wagner, Stephen P. Cook, Paul E. Pulley, Robert N. Coulson and Thomas M. McArdle (1987)
Host colonization by cohabiting Dendroctonus frontalis, Ips avulsus, and I. calligraphus (Coleoptera: Scolytidae)
Environmental Entomology 16 (2), 390-399
Abstract: Interactions during colonization among the southern pine bark beetle guild members Dendroctonus frontalis Zimmermann, Ips avulsus (Eichhoff), and Ips calligraphus (Germar) were investigated in nine loblolly pines, Pinus taeda L. This study examined host colonization and the manner by which competition is reduced among members of a guild. Two components of colonization were used for this analysis: accumulation of attacking adults and gallery construction. Attack and gallery construction were examined in individual trees and as an average process for all trees. Vertical arrangements of D. frontalis attack and gallery were similar among trees, but the arrangement differed for each Ips species. I. avulsus showed the most rapid accumulation of attacking adults and gallery followed by D. frontalis and I. calligraphus. D. frontalis and I. calligraphus produced less gallery per adult at high adult densities, suggesting presence of a density-dependent compensatory feedback mechanism that regulates their egg densities. I. avulsus did not show this relationship. The species studied are members of a guild that is partially maintained through reduction or avoidance of competition. We found that differences in attributes of attack patterns among guild members served to separate breeding areas and, therefore, reduce competition for oviposition sites among the species. The density-dependent compensatory feedback mechanism reduced competition within and among brood species.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Robert N. Coulson, Stephen Cook

Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation
general biology - morphology - evolution

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Dendroctonus frontalis	Pine (Pinus)
	Ips avulsus	Pine (Pinus)
	Ips calligraphus	Pine (Pinus)