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Attractive and inhibitory pheromones produced in the bark beetle,Dendroctonus brevicomis, during host colonization: Regulation of inter- and intraspecific competition

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Abstract

Quantities of attractive (exo-brevicomin and frontalin) and inhibitory (trans-verbenol, verbenone, and ipsdienol) pheromones were monitored in both sexes ofDendroctonus brevicomis during their colonization of a ponderosa pine. Verbenone was found in males in the greatest amounts at the time of landing, and it declined more rapidly than the other pheromones in either sex. The amounts of frontalin andexo-brevicomin in males and females, respectively, increased after initial boring within the host but began to decline after mating. The quantity oftrans-verbenol in both sexes (females had significantly more) declined more gradually thanexo-brevicomin, frontalin, and verbenone. Ipsdienol was found only in males during the initial stages of attack when encountering the resin. It is suggested that along with a general decline in all pheromonal components, a sufficient change in the ratio of the attractive pheromones to an inhibitory pheromone,trans-verbenol, may play a role in termination of aggregation.trans-Verbenol may also function along with verbenone and ipsdienol in limiting the density of attack and thus intraspecific competition. These inhibitory pheromones also appear to cause several competing species of bark beetle to avoid landing in areas infested withD. brevicomis, even when their own pheromone is present.

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Author notes

  1. John A. Byers

    Present address: Department of Animal Ecology, University of Lund, S-223 62, Lund, Sweden

Authors and Affiliations

  1. Department of Entomological Sciences, University of California, 94720, Berkeley, California

    John A. Byers & David L. Wood

  2. Departments of Medicine and Endocrinology, Medical College of Georgia, 30912, Augusta, Georgia

    John Craig & Larry B. Hendry

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  1. John A. Byers
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  2. David L. Wood
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  3. John Craig
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Additional information

Coleoptera:Scolytidae. These studies were supported in part by the Rockefeller Foundation, USDA Forest Service, Regional research project W-110, SEA/ USDA, and the National Science Foundation and Environmental Protection Agency through a grant (NSF GB-34719/BMS 75-04223) to the University of California.

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Byers, J.A., Wood, D.L., Craig, J. et al. Attractive and inhibitory pheromones produced in the bark beetle,Dendroctonus brevicomis, during host colonization: Regulation of inter- and intraspecific competition. J Chem Ecol 10, 861–877 (1984). https://doi.org/10.1007/BF00987969

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  • DOI: https://doi.org/10.1007/BF00987969

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