Stringy Butt Rot
Trunk, Root, Stump
Damage, symptoms and biology
This fungus forms as a cream or brown crust on infected trees or snags. The pores are initially cream-coloured, turning yellowish brown over time. In conifers, it behaves like a root rot but also infects sapwood. In hardwoods, it is a saprophyte on sapwood.
The presence of fruiting bodies on living trees indicates up to 3 to 4 m of defect; on dead trees fruiting bodies indicate almost total cull.
Root and butt decay caused by P. subacida can cause significant losses and predispose infected trees to wind throw.
Canadian Forest Service Publications
Information on host(s)
Alders, American chestnut, arbutus, birch, cherries / plums, juniper, larches / tamaracks, mountain hemlock, poplars / aspens / cottonwoods, Rocky Mountain Douglas-fir, scots pine, shore pine, tamarack, tulip-tree, western larch, western white pine, willow
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