Abstract
Laboratory bioassays indicated that frass produced byGnathotrichus retusus males and male gut extracts were attractive to both sexes of beetles. The frass became attractive to females within 2 days of the commencement of boring activity, and attractive frass was produced for at least lOdays. Attraction of frass rose sharply after pairing of males with females. However, this increase in attraction could be due to increased boring activity and pheromone production by males following establishment of the mutualistic fungus. In field trapping experiments, male-infested logs were always highly attractive, but in one experiment, female-infested logs and logs infested by both sexes were also attractive. Thus, females could be involved in secondary attraction. High cross-attraction ofG. sulcatus toG. retusus infested logs in field experiments, as well as a moderate but significant response byG. retusus to sulcatol in the laboratory, suggests that they share sulcatol as a common pheromone.
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Research supported by Canadian Forestry Service Science Subvention Grant, National Research Council of Canada Operating Grant No. A3881, National Science Foundation (U.S.A.) Operating Grant No. PCM74-13643-A02, and the Council of Forest Industries of British Columbia.
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Borden, J.H., McLean, J.A. Secondary attraction inGnathotrichus retusus and cross-attraction ofG. sulcatus (Coleoptera: Scolytidae). J Chem Ecol 5, 79–88 (1979). https://doi.org/10.1007/BF00987689
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DOI: https://doi.org/10.1007/BF00987689