Comparative susceptibility of conifers to western hemlock dwarf mistletoe in the cascade mountains of Washington and Oregon

Robert L. Mathiasen, Carolyn M. Daugherty

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

A total of 24 mixed conifer stands in Washington and Oregon infested with western hemlock dwarf mistletoe (Arceuthobium tsugense subsp. tsugense) were sampled to compare host susceptibility to this parasitic plant. Temporary circular plots were established around dominant, severely infected western hemlocks (Tsuga heterophylla). Within plots, species, diameter at breast height, and dwarf mistletoe rating (6-class system) were determined for each live tree. More than 5,700 trees were sampled in 275 plots. Based on the incidence of infection, tree species were assigned to host susceptibility classes. Western hemlock is classified as the only principal host of western hemlock dwarf mistletoe. Pacific silver fir (Abies amabilis), noble fir (Abies procera), and mountain hemlock (Tsuga mertensiana) are classified as occasional hosts. Resource managers can use the host susceptibility classifications based on this study for decisions regarding which trees to retain when selectively harvesting mixed conifer stands infested with western hemlock dwarf mistletoe in the Pacific Northwest.

Original languageEnglish (US)
Pages (from-to)94-100
Number of pages7
JournalWestern Journal of Applied Forestry
Volume20
Issue number2
StatePublished - Apr 2005

Fingerprint

Santalales
Cascade Mountain region
conifers
coniferous tree
Tsuga mertensiana
Abies procera
mountain
Abies amabilis
Arceuthobium tsugense
Tsuga heterophylla
parasitic plant
parasitic plants
tree and stand measurements
silver
managers
taxonomy
incidence
resource
infection

Keywords

  • Abies amabilis
  • Arceuthobium tsugense
  • Host susceptibility
  • Tsuga heterophylla

ASJC Scopus subject areas

  • Forestry
  • Plant Science

Cite this

Comparative susceptibility of conifers to western hemlock dwarf mistletoe in the cascade mountains of Washington and Oregon. / Mathiasen, Robert L.; Daugherty, Carolyn M.

In: Western Journal of Applied Forestry, Vol. 20, No. 2, 04.2005, p. 94-100.

Research output: Contribution to journalArticle

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