First report of the Armillaria root disease pathogen, Armillaria gallica, on Douglas-fir (Pseudotsuga menziesii) in Arizona

E.V. Nelson; M. L. Fairweather; S. M. Ashiglar; John W. Hanna; Ned B. Klopfenstein

doi:10.1094/PDIS-04-13-0450-PDN

Treesearch

First report of the Armillaria root disease pathogen, Armillaria gallica, on Douglas-fir (Pseudotsuga menziesii) in Arizona

Formally Refereed

Authors:

E.V. Nelson, M. L. Fairweather, S. M. Ashiglar, John W. Hanna, Ned B. Klopfenstein

Year:

2013

Type:

Scientific Journal

Station:

Rocky Mountain Research Station

DOI:

https://doi.org/10.1094/PDIS-04-13-0450-PDN

Source:

Plant Disease. 97(12): 1658.

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Abstract

In August 2010, a mycelial fan (isolate AZ32F) of Armillaria sp. was collected from the root collar of a living Douglas-fir tree on the Mogollon Rim within the Coconino National Forest (approximate location 34°25′31.26″N, 111°20′41.04″W, elevation 2,293 m) in central Arizona. Mycelial fans under the bark of living trees are a sign of pathogenicity, and symptoms of the diseased tree included resinosis, sloughing bark, and thinning crown. The infected tree was located on a south-facing slope with approximately 30% tree cover, dominated by ponderosa pine (Pinus ponderosa), with lesser components of Douglas-fir and Gambel oak (Quercus gambelii).

Keywords

Armillaria root disease, Armillaria gallica, pathogens, Douglas-fir, Pseudotsuga menziesii

Citation

Nelson, E.V.; Fairweather, M. L.; Ashiglar, S. M.; Hanna, J. W.; Klopfenstein, N. B. 2013. First report of the Armillaria root disease pathogen, Armillaria gallica, on Douglas-fir (Pseudotsuga menziesii) in Arizona. Plant Disease. 97(12): 1658.