Annosus Root and Butt Rot - Pine Tree Annosus Root and Butt Rot Disease

Heterobasidion annosum (Fr.:Fr.) Bref.
(= Fomes annosus (Fr.:Fr.) Cooke)
(anamorph = Spiniger meineckellum (A. Olson) Stalpers)

Basidiomycotina, Aphyllophorales, Polyporaceae

Hosts:Heterobasidion annosum has a very wide host range including both coniferous and broadleaved species. It has been reported in B.C. on amabilis and grand fir, white and Sitka spruce, lodgepole pine, Douglas-fir, western redcedar, western hemlock, bigleaf maple, and alder. In other parts of North America it has also been found on mountain hemlock, California incense cedar, juniper, subalpine fir, western larch, ponderosa and western white pine, Engelmann spruce, chestnut, hickory, honeysuckle, apple, poplar, oak,, sagebrush, Arbutus, Arctostaphylos, Camellia, Cercocarpus Chamaecyparis thyoides, Diospyros, Kalmia, Pachistima, Prunus spp., antelope-brush, Rhododendron, Sequoia, and Sequoiadendron. Two forms of the fungus are recognized in North America: the p-type, which occurs mainly on pine, incense cedar, hardwood and brush, and the s-type, which infects other conifer species. The p-type will infect both p-and s-type hosts, whereas the s-type is restricted to s-type hosts. To date only the s-type has been detected in B.C.

Distribution: This fungus affects trees west of the coast mountains and in the Interior Cedar Hemlock biogeoclimatic zone.

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