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    Description

    We examined the major bark beetles and associated fungi colonizing subcortical tissues of white spruce (Picea glauca (Moench) Voss) in the Great Lakes region. Trees were felled at one northwestern Wisconsin site in a preliminary study in 1997 and at 10 sites throughout northern Wisconsin, Minnesota, and Michigan in 1998. Fungal isolations were made from beetles colonizing felled trees, beetles that emerged from felled trees, tissue of colonized trees, and tissue of uncolonized trees. Dryocoetes affaber (Mannerheim) and Polygraphus rufipennis (Kirby) accounted for over 90% of the insects that emerged from logs. Time of colonization had a significant effect on abundance and composition of emerging insects. New records include Dendroclonus rufipennis (Kirby) in Wisconsin and two Michigan counties and Crypturgus borealis (Swaine) in Wisconsin and Minnesota and one Michigan county. Five fungal species from two genera were isolated both from beetles and colonized tree tissue. None were isolated from uncolonized trees. Ten new beetle-fungal associations were identified. The association of specific fungi with specific bark beetles, both as they colonize and emerge from hosts and the isolation of these fungi from subcortical tissues of colonized hut not uncolonized trees, is consistent with vector relationships. We compare our results with bark beetle - fungal associations reported elsewhere in spruce and suggest possible mechanisms constraining population growth by Dendroctonus rufipennis in the Great Lakes region.

    Publication Notes

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    Citation

    Haberkern, Kirsten E.; Illman, Barbara L.; Raffa, Kenneth F. 2002. Bark beetles and fungal associates colonizing white spruce in the Great Lakes region. Canadian journal of forest resources. Vol. 32 (2002). Pages 1137-1150.

    Keywords

    bark beetles, white spruce, fungal associates.

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https://www.fs.usda.gov/treesearch/pubs/6336