Pocket rot of cedar
- Latin name: Postia sericeomollis (Romell) Jülich
- French name: Carie alvéolaire du thuya
- Division: Basidiomycota
- Class: Aphyllophorales
- Synonym(s): Oligoporus sericeomollis-1 (Romwell) Pouzar,
Polyporus sericeomollis-1 Romwell,
Poria asiatica-1 (Pilàt) Overh.,
Poria sericeomollis-1 (Romwell) Egeland,
Tyromyces sericeomollis-1 (Romwell) Bondartsev & Singer
Damage, symptoms and biology
This decay is very common in the butt logs of western red cedar, resulting in significant volume losses in both interior and coastal trees. Brown cubical rot symptoms are commonly found in cedar lumber but the decay is not known to develop further in wood in service.
Cedar pocket rot is an important butt and trunk decay of western red cedar, ranking second to Phellinus pini as the most common decay in that species. Postia sericeomollis could be confused with Phaeolus schweinitzii. Decay in the former, however, usually forms in pockets or rings of decay, whereas P. schweinitzii usually forms a single column of decay in the centre of the stem. This distinction may be less clear in the stump than higher in the stem. In addition, P. schweinitzii is rarely found in western red cedar.