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    Author(s): Jim Worrall; Leanne Egeland; Tom Eager; Roy Mask; Erik Johnson; Phil Kemp; Wayne Shepperd
    Date: 2008
    Source: In: McWilliams, Michael; Palacios, Patsy, comps. Proceedings of the 55th Annual Western International Forest Disease Work Conference; 2007 October 15-19; Sedona, AZ. Salem, OR: Oregon Department of Forestry. p. 63-66.
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (1.47 MB)

    Description

    An initial assessment of rapid dieback and mortality of aspen in southwest Colorado suggests that it represents a decline disease incited by acute, warm drought. Predisposing factors include low elevation, south and southwest aspects, droughty soils, open stands, and physiological maturity. Contributing factors include Cytospora canker, two bark beetles, poplar borer, and bronze poplar borer. Because this is a true decline disease distinct from "aspen decline" as often discussed in the literature, we refer to it as sudden aspen decline. There has been little regeneration response to overstory loss.

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    Citation

    Worrall, Jim; Egeland, Leanne; Eager, Tom; Mask, Roy; Johnson, Erik; Kemp, Phil; Shepperd, Wayne. 2008. Sudden aspen decline in southwest Colorado: Site and stand factors and a hypothesis on etiology. In: McWilliams, Michael; Palacios, Patsy, comps. Proceedings of the 55th Annual Western International Forest Disease Work Conference; 2007 October 15-19; Sedona, AZ. Salem, OR: Oregon Department of Forestry. p. 63-66.

    Keywords

    sudden aspen decline (SAD), rapid dieback, mortality

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https://www.fs.usda.gov/treesearch/pubs/34415