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    Author(s): N. B. Klopfenstein; J. E. Lundquist; J. W. HannaM.-S. KimG. I. McDonald
    Date: 2009
    Source: Plant Disease. 93(1): 111. Online:
    Publication Series: Scientific Journal (JRNL)
    Station: Rocky Mountain Research Station
    PDF: Download Publication  (222.67 KB)


    In August of 2007, a preliminary survey was conducted in Alaska to evaluate potential impacts of climate change on forest trees. Armillaria sinapina, a root-disease pathogen, was isolated from conifer and hardwood hosts on climatically diverse sites spanning 675 km from the Kenai Peninsula to the Arctic Circle. Seven isolates (NKAK1, NKAK2, NKAK5, NKAK6, NKAK9F, NKAK13, and NKAK15) were identified as A. sinapina by using intergenic spacer-1 nucleotide sequences (GenBank Accession Nos. EU665175­EU665181) and somatic pairings. Of particular note is that one isolate (NKAK9F) was obtained from a declining Salix sp. (willow) growing in a flood plain near the Arctic Circle (66°32.316'N, 150°47.717'W). This isolate was collected from mycelial bark fans that were intercalated within multiple bark layers, a sign of disease. All other isolates were derived from rhizomorphs attached to and/or embedded within roots and root collars, but most host trees showed no clear indication of disease.

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    Klopfenstein, N. B.; Lundquist, J. E.; Hanna, J. W.; Kim, M.-S.; McDonald, G. I. 2009. First report of Armillaria sinapina, a cause of armillaria root disease, associated with a variety of forest tree hosts on sites with diverse climates in Alaska. Plant Disease. 93(1): 111. Online:


    armillaria root disease, Armillaria sinapina, Alaska

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