White trunk rot of conifers

White trunk rot of conifers - Decay caused by <em>P. hartigii</em> in a cross-section of a western hemlock branch
  • Latin name: Phellinus hartigii (Allesch. & Schnabl) Pat.
  • French name: Carie blanche du tronc des conifères
  • Division: Basidiomycota
  • Class: Aphyllophorales
  • Synonym(s): Fomes hartigii (Allesch. & Schnabl) Bres.,
    Polyporus hartigii Allesch. & Schnabl
Description

Micro-habitat(s)

Trunk

Distribution

Western Canada

Damage, symptoms and biology

Trees damaged by white trunk rot are prone to wind damage, usually breaking within 6 m of the ground. Decay is usually localized to tissues near the point of infection, but spreads 1 to 2 m up and down from each fruiting body.

Other information

The taxonomy of this fungus has been complicated by its morphological variation on different hosts. As a result, many names have been applied to the organism. In the past, many P. hartigii specimens were named Fomes or Phellinus robustus, a name that is now restricted to a related fungus on hardwoods. Another fungus, Poria tsugina (Murrill) Sacc. & Trott., now recognized as Phellinus punctatus (Fr.) Pilát, has resupinate fruiting bodies that are sometimes confused with those of P. hartigii.

Canadian Forest Service Publications

White trunk rot of conifers

Information on host(s)

Main host(s)

Western hemlock

Secondary host(s)

Amabilis fir, Rocky Mountain Douglas-fir, subalpine fir

Photos
  • White trunk rot of conifers Fruiting bodies of Phellinus hartigii on a stem of western hemlock
  • White trunk rot of conifers Fruiting bodies of Phellinus hartigii on a branch stub of western hemlock
  • White trunk rot of conifers Decay caused by P. hartigii in a cross-section of a western hemlock branch
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