Laminated root rot cedar form
- Latin name: Phellinus weirii-2 (Murrill) R. L. Gilbertson
- French name: Carie laminée des racines du thuya géant
- Division: Basidiomycota
- Class: Aphyllophorales
Base of tree
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.