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Date Permissions Signed
Date of Award
Master of Science (MS)
Matthews, Robin A., 1952-
Robbins, Lynn A.
Taylor, Ronald J., 1932-
This study examines the cause, distribution and impact of a forest pathogen within the 71 forested hectares of the Sehome Hill Arboretum in urban Bellingham, Washington. The causal agent was determined by the identification of cultures from decaying wood in douglas fir (Pseudotsuga menziesii (Mirbel) Franco) to be the root rotting basidiomycete Phellinus weirii (Muir.) Gilb. A ground survey of aboveground symptoms was used to detect 31 infection centers covering 6.64 hectares (9.2% of the Arboretum) of symptomatic trees. Infra-red aerial photography was used to determine canopy cover for deciduous and evergreen species. A forest canopy survey was conducted to determine canopy dominance in each of 22 forested regions of the Arboretum. Basal area at breast height was used to establish dominance. Tree density and size-class distributions were used to predict future dominance in the presence of continuing Phellinus root rot infection. Seven management approaches were discussed.
Western Washington University
Subjects – Names (LCNAF)
Sehome Hill Arboretum (Bellingham, Wash.)
Subject – LCSH
Douglas fir--Washington (State)--Bellingham; Phellinus--Washington (State)--Bellingham; Root rots
Copying of this thesis in whole or in part is allowable only for scholarly purposes. It is understood, however, that any copying or publication of this document for commercial purposes, or for financial gain, shall not be allowed without the author’s written permission.
Cantrell, William G. (William Gary), "Phellinus Weirii Root Rot of Douglas Fir in the Sehome Hill Arboretum: Distribution, Impact and Management Options" (1990). WWU Graduate School Collection. 881.