Coniferiporia weirii

Coniferiporia weirii is a species of fungus. It is a plant pathogen that causes 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]

Coniferiporia weirii
Fruit bodies
Scientific classification
Domain:	Eukaryota
Kingdom:	Fungi
Division:	Basidiomycota
Class:	Agaricomycetes
Order:	Hymenochaetales
Family:	Hymenochaetaceae
Genus:	Coniferiporia
Species:	C. weirii
Binomial name
Coniferiporia weirii (Murrill) L.W. Zhou & Y.C. Dai (2016)
Synonyms[1]
List Fomitiporia weirii Murrill (1914) Poria weirii (Murrill) Murrill (1914) Fuscoporia weirii (Murrill) Aoshima (1953) Inonotus weirii (Murrill) Kotl. & Pouzar (1970) Phellinidium weirii (Murrill) Y.C.Dai (1995) Phellinus weirii (Murrill) Gilb. (1974)

Description

Coniferiporia weirii root rot is recognized first by the symptoms it induces in its hosts. Reduced terminal growth is usually the first symptom to appear, followed by yellowing (chlorosis) and thinning of crowns. Reduced growth rate is an attribute of tree infection.^[4] Particular attention is invited to the growth ring patterns visible in the images below.

Commercial losses

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.^[5]

• 
  Moderately advanced infection
• 
  Close up of 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