Often met on oaks, weakened weakened and dying trees, by butt rot
invaders (beefsteak secondary parasite.
Heterobasidion annosum root and butt rot of Norway spruce, Picea abies: colonization by the fungus and its impact on tree growth.
a new coelomycete associated with butt rot of Picea abies in Switzerland.
The forces in question are the fungi responsible for root and butt rot or decay--a closely related group of species that specialize in causing large trees to fail.
In the forest, root and butt rot fungi are among the most common causes of tree disease, especially among large, mature trees.
Certain situations tend to increase the occurrence of root and butt rot fungi and their associated problems.
Root and butt rot pose a particular problem in urban forests.
In order to identify the grade zones (sections) along a tree stem to be bucked, the bucker needs first to observe its surface characteristics, including the severity and location of defect, butt rot, sweep, and dimensions of the tree stem based on the field bucking requirements and procedures (Wang and Wang 1992).
If that tree-stem is 15 m long, the 1-m-deep butt rot should be cut off, and then 8-m and 6-m logs should be bucked.
This fungus has been isolated from Douglas-fir, spruces, and frequently from stumps, trunk, or butt rots
or from products exposed to continuous wetting.