Phellinus weirii

Phellinus weirii is a plant pathogen causing laminated root rot in certain conifers, typically Douglas-fir and western redcedar.[2] It is widespread in the Douglas-fir growing regions of British Columbia, Washington and Oregon.[3]

Phellinus weirii
Fruit bodies of Phellinus weirii
Scientific classification
Kingdom: Fungi
Division: Basidiomycota
Class: Agaricomycetes
Order: Hymenochaetales
Family: Hymenochaetaceae
Genus: Phellinus
Species:
P. weirii
Binomial name
Phellinus weirii
(Murrill) Gilb. (1974)
Synonyms[1]
  • Fomitiporia weirii Murrill (1914)
  • Fuscoporia weirii (Murrill) Aoshima (1953)
  • Inonotus weirii (Murrill) Kotl. & Pouzar (1970)
  • Phellinidium weirii (Murrill) Y.C.Dai (1995)

Overview

Symptoms of fungal infection are readily recognized when timber is cut because a brown stain will appear on the butt cut. In early stages it will be just a spot in the heart wood, but as the disease advances it will extend most of the way around the heart wood, and in extreme cases may result in a hollow stump. Usually it is not observed more than a few feet above ground level.

Losses due to the fungus are estimated at 4.4 million m3 (157 million ft3) of timber in the Northwestern United States and in British Columbia.[4]

Reduced growth rate is an attribute of tree infection.[5] Particular attention is invited to the growth ring patterns visible in the images attached.

  • Moderately advanced infection
  • Close up of Phellinus weirii infection at Apiary, Oregon
  • Hollow log at stump level---An extreme case of infection
  • View of long butt showing reduced rot a few feet up from the stump

References
  1. "GSD Species Synonymy: Phellinus weirii (Murrill) Gilb". Species Fungorum. Kew Mycology. Retrieved 2017-01-23.
  2. Natural Resources Canada. "Laminated root rot". Archived from the original on September 2, 2006. Retrieved 2008-10-04.
  3. "Forest Pathology: Laminated Root Rot". Canadian Forest Service. Archived from the original on 2007-04-15. Retrieved 2007-07-16.
  4. "Laminated Root Rot of Western Conifers". U.S. Department of Agriculture. Retrieved 2007-07-16.
  5. http://www.fs.fed.us/pnw/pubs/gtr349/gtr349b.pdf


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