Laminated root rot cedar form

• French disease name: Carie laminée des racines du thuya géant
• Pathogen name: Phellinus weirii-2 (Murrill) R. L. Gilbertson
• Class: Aphyllophorales

Distribution

• Western Canada

Damage, symptoms and biology

Western red cedar is rarely killed by P. weirii, damage being confined mostly to butt rot, which can extend 2 to 3 m up the bole of living trees; in cases of severe decay, up to 10 m. Most old-growth cedar has some degree of butt rot, much of which is caused by P. weirii weaken the tree and lead to stem breakage low on the bole.

Canadian Forest Service Publications

Laminated root rot cedar form

Information on host(s)

Main host(s)

• Western redcedar

Secondary host(s)

• Yellow-cedar