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Notes: Comparative Susceptibility of Corkbark Fir and Douglas-fir to Douglas-fir Dwarf Mistietoe

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Corkbark fir (Abies lasiocarpa var. arizonica [Merriam] Lemm.) is less susceptible to infection by Douglas-fir dwarf mistletoe (Arceuthobium douglasii Engelm.) than previously reported. Infection of corkbark fir was less than 20 percent in nearly all of the mixed conifer stands sampled, regardless of the intensity of infection on Douglas-fir (Pseudotsuga menziesii [Mirb.] Franco), the principal host of A. douglasii. Only 7 percent of the 2,666 live corkbark firs sampled in 47 plots were infected compared to 61 percent infection for 2,106 live Douglas-firs. Infection of most corkbark firs was light to moderate when rated using the 6-class dwarf mistletoe rating system. Infection of corkbark fir increased as infection of Douglas-fir increased, but infection of corkbark fir remained consistently below the levels reached in Douglas-fir. Therefore, the impact of A. douglasii on corkbark fir is not serious on a stand basis, but occasionally large corkbark firs are heavily infected. Control of A. douglasii on corkbark fir need not be a major concern of forest managers in most southwestern mixed conifer forests. Forest Sci. 30:842-847.
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Keywords: Abies lasiocarpa var. arizonica; Arceuthobium douglasii; Pseudotsuga menziesii; Southwest

Document Type: Miscellaneous

Affiliations: School of Forestry, Northern Arizona University, Flagstaff, AZ 86011

Publication date: 1984-09-01

More about this publication?
  • Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2016 Impact Factor: 1.782 (Rank 17/64 in forestry)

    Average time from submission to first decision: 62.5 days*
    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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