Comparative susceptibility of subalpine firs to Douglas-fir dwarf mistletoe

Robert L. Mathiasen

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Subalpine fir (Abies Lasiocarpa (Hook.) Nutt.) and Rocky Mountain subalpine fir (Abies bifolia A. Murr.) are more susceptible to infection by Douglas-fir dwarf mistletoe (Arceuthobium douglasii Engelm.) than previously reported. Temporary circular plots (6-m radius) were established around dominant, severely infected Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco). Within plots, species, diameter at 1.37 m above the ground, and dwarf mistletoe rating (6-class system) were determined for each live tree over 1.37 m in height. Sixty-six percent and 15% of the subalpine fir and Rocky Mountain subalpine fir, respectively, sampled near large, severely infected Douglas-fir were infected. In contrast, over 90% of the Douglas-fir in the same plots were infected. Based on these results, subalpine fir is classified as a secondary host of Douglas-fir dwarf mistletoe and Rocky Mountain subalpine fir is classified as an occasional host. Variation in the infection of subalpine fir by Douglas-fir dwarf mistletoe in relation to the taxonomic status of these hosts is discussed.

Original languageEnglish (US)
Pages (from-to)45-51
Number of pages7
JournalCanadian Journal of Plant Pathology
Issue number1
StatePublished - Mar 1999


  • Abies Lasiocarpa
  • Arceuthobium douglasii
  • Douglas-fir dwarf mistletoe
  • Subalpine fir
  • Susceptibility

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Plant Science


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