Stringy Butt Rot
- Latin name: Perenniporia subacida (Peck) Donk
- French name: Carie filandreuse du pied
- Division: Basidiomycota
- Class: Aphyllophorales
- Synonym(s): Poria colorea Overh.,
Poria homaena (Berk.) Cooke,
Poria subacida (Peck) Sacc.
Description
Micro-habitat(s)
Trunk, Root, Stump
Distribution
Canada
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.
Other information
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)
Main host(s)
Amabilis fir, balsam fir, Engelmann spruce, grand fir, Sitka spruce, subalpine fir, western hemlock, western redcedar, white spruce
Secondary 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
Photos
Advanced decay with mycelial mats caused by P. subacida Eric Allen
Advanced decay with mycelial mats caused by P. subacida Ray Foster
P. subacida sporophore on western redcedar W.Poter