Pitted sap rot

Pitted sap rot - A mass of fruiting bodies in typical abundance on a dead Douglas-fir stem
  • Latin name: Trichaptum abietinum (Dickson:Fr.) Ryvarden
  • French name: Carie blanche de l'aubier
  • Division: Basidiomycota
  • Class: Aphyllophorales
  • Synonym(s): Coriolus abietinus (Dickson:Fr.) Quél.,
    Hirshioporus abietinus (Dickson:Fr.) Donk,
    Polyporus abietinus (Dickson:Fr.) Fr.,
    Polystictus abietinus (Dickson:Fr.) Cooke





Damage, symptoms and biology

The fungus is of primary importance as a deteriorating agent but is also capable of causing sap rot and heart rot in living trees. Extensive decay of sapwood is indicated by the presence of fruiting bodies. It has been reported to have caused decay in unseasoned wood in service.

Other information

The decay caused by this fungus is restricted to the sapwood; fruiting bodies often form a complete ring on the sapwood of the cut ends of logs. The fruiting bodies of T. abietinum could be confused with those of Stereum sanguinolentum. The hymenium of the latter will turn red when bruised. Earlier taxonomic treatments of T. abietinum were broad, and included fungi now recognized as separate species (T. fuscoviolaceum and T. laricinum).

Canadian Forest Service Publications

Pitted sap rot

Information on host(s)

Main host(s)

Amabilis fir, arbutus, balsam fir, black spruce, Engelmann spruce, grand fir, mountain hemlock, ponderosa pine, red spruce, Rocky Mountain Douglas-fir, scots pine, shore pine, Sierra redwood, Sitka spruce, subalpine fir, western hemlock, western larch, western redcedar, western white pine, whitebark pine, white spruce

Secondary host(s)

Eastern hemlock, eastern white pine, jack pine, red pine, tamarack

  • Pitted sap rot
    Claude Moffet
  • Pitted sap rot Old fruiting bodies of T. abietinum with algae growing on the upper surface
    Eric Allen
  • Pitted sap rot The ridged pore layer of T. abietinum fruiting bodies
    Eric Allen
  • Pitted sap rot A mass of fruiting bodies in typical abundance on a dead Douglas-fir stem
    Richard Reich
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