Phellinus weirii
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| Phellinus weirii | ||||||||||||||||
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| Phellinus weirii (Murrill) Gilb., (1974) |
Phellinus weirii, commonly known as Laminated Root Rot, is a plant pathogen most notable for infecting Douglas Fir. It is widespread in the Douglas Fir Growing regions of British Columbia, Washington and Oregon.[1] It is easily 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.[2]
Reduced growth rate is an attribute of tree infection.[3] 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. |
[edit] References
- ^ Forest Pathology: Laminated Root Rot. Canadian Forest Service. Retrieved on 2007-07-16.
- ^ Laminated Root Rot of Western Conifers. U.S. Department of Agriculture. Retrieved on 2007-07-16.
- ^ http://www.fs.fed.us/pnw/pubs/gtr349/gtr349b.pdf
[edit] External links
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