Red ring rot
- French disease name: Carie blanche alvéolaire
- Pathogen name: Phellinus pini (Thore:Fr.) A. Ames
- Class: Aphyllophorales
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Partial list of synonyms:
- Fomes pini (Thore:Fr.) P. Karst.
- Porodaedala pini (Thore:Fr.) Murrill
- Trametes pini (Thore:Fr.) Fr.
Distribution
Canada
Damage, symptoms and biology
The fungus causes red ring rot in the trunk of infected trees. The fungal fruiting bodies are hard, woody and perennial, that is, they remain on the tree season after season. The shape of the fruiting bodies is quite variable, ranging from hoof-shaped to bracket-like. Their upper surface may be a dark grayish colour to dark brown verging on black, often with some darker concentric circles parallel to the perimeter. The fruiting bodies release spores in cool, wet weather. The spores re-enter the tree through a dead branch stub. Wounds in the bark do not appear to be an important source of infection. Once the disease is well established, tiny spindle-shaped zones of white tissue appear; these are a distinctive characteristic of the disease.
Other information
The disease only kills infected trees when the infection is very severe and generalized.
Canadian Forest Service Publications
Information on host(s)
Main host(s)
Engelmann spruce, Nootka false cypress, Rocky Mountain Douglas-fir, Sitka spruce, amabilis fir, balsam fir, black spruce, eastern white pine, grand fir, jack pine, mountain hemlock, ponderosa pine, red pine, shore pine, subalpine fir, tamarack, western hemlock, western larch, western redcedar, western white pine, white spruce
Photos
Fruiting body
Phellinus pini fruiting bodies on Douglas-fir
Duncan Morrison
Phellinus pini fruiting bodies on pine
Eric Allen
Phellinus pini fruiting bodies on Douglas-fir
Eric Allen
Incipient red stain in the heartwood of pine
Eric Allen
White pocket rot characteristic of Phellinus pini
Eric Allen
Fruiting body of Phellinus pini, the causal agent of red ring rot, on a branch stub of a living white pine. The fungus causes a white pocket rot.