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Pocket rot of cedar

Pocket rot of cedar - Brown Cubical butt / Pocket Rot in western redcedar
  • 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




British Columbia

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.

Other information

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.

Canadian Forest Service Publications

Pocket rot of cedar

Information on host(s)

Main host(s)

Western redcedar


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