Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub
    Author(s): James T. Blodgett; John W. Hanna; Eric W. I. Pitman; Sara M. Ashiglar; John E. LundquistMee-Sook Kim; Amy L. Ross-Davis; Ned B. Klopfenstein
    Date: 2015
    Source: In: Murray, Michael; Palacios, Patsy, comps. Proceedings of the 62nd annual Western International Forest Disease Work Conference; September 8-12, 2014; Cedar City, Utah. p. 29-33.
    Publication Series: Paper (invited, offered, keynote)
    Station: Rocky Mountain Research Station
    PDF: Download Publication  (7.0 MB)


    Armillaria species range from beneficial saprobes to damaging root pathogens, and their ecological roles and impacts vary with environment and host. Armillaria solidipes [pending vote to conserve A. ostoyae . (Redhead et al. 2011 )] is known as an aggressive pathogen of conifers and causes tree mortality and significant growth loss in Wyoming and throughout the world. Armillaria solidipes also seems to exist in a nonpathogenic state under certain conditions that vary depending on environment, host, and community (unpublished data). In this case, A. solidipes can be difficult to differentiate from other Armillaria spp. The ecological role of A. gallica, A. sinapina, and A. cepistipes has been generally characterized as primarily saprophytic to weakly pathogenic. However, A. gallica has recently been described as highly pathogenic on hardwoods in some forests (Brazee and Wick 2009). On aspen, A. gallica and A. sinapina might be more aggressive pathogens than A. solidipes (Blodgett 2015, this proceedings, submitted). Armillaria gallica and A. sinapina are a common components of forest ecosystems and they have recently been found in areas where they were not previously known to occur (Klopfenstein et al. 2009, Kim et al. 2010, Kim and Klopfenstein 2011 , Elias-Roman et al. 2013, Nelson et al. 2013, Klopfenstein et al. 2014). Furthermore, all of these typically saprophytic Armillaria species are thought to be an important component of forest decline. Under the host/stress/saprogen concept, disease develops when these secondary pathogens, which are already onsite, invade host tissue after environmental stress (Houston 1992). These stressors can include climate, human disturbance, and/or insect/pathogen pests. This type of forest decline is believed to be increasing and generally more severe under climate change as trees become progressively maladapted to their environments (Kliejunas et al. 2009). In this study, we use DNA-based methods to confirm species identification and utilize location-specific climate data for bioclimatic modeling to predict where Armillaria spp. are likely to occur and cause disease and forest decline.

    Publication Notes

    • You may send email to to request a hard copy of this publication.
    • (Please specify exactly which publication you are requesting and your mailing address.)
    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.


    Blodgett, James T.; Hanna, John W.; Pitman, Eric W. I.; Ashiglar, Sara M.; Lundquist, John E.; Kim, Mee-Sook; Ross-Davis, Amy L.; Klopfenstein, Ned B. 2015. Bioclimatic models estimate areas with suitable climate for Armillaria spp. in Wyoming. In: Murray, Michael; Palacios, Patsy, comps. Proceedings of the 62nd annual Western International Forest Disease Work Conference; September 8-12, 2014; Cedar City, Utah. p. 29-33.


    climate, Armillaria spp., root pathogens, DNA

    Related Search

    XML: View XML
Show More
Show Fewer
Jump to Top of Page