Sterile conk trunk rot of birch
Damage, symptoms and biology
The fruiting bodies are composed of black, sterile masses. They are rough and remain on the tree for several years.
Infected trees are severely damaged. The presence of a single sterile conk indicates extensive heartwood decay; 50% to 100% cull is assumed.
Infection occurs through dead branch stubs, trunk wounds, or through pre-existing cankers (e.g., Nectria) by spores produced by fertile fruiting bodies. Decay characteristics and small sterile conks are similar in appearance to those of Phellinus igniarius.
Canadian Forest Service Publications
Information on host(s)
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