Heterobasidion irregulare, Phellinus weirii, Onnia tomemtosa and Phaeolus schweinitzii
Root Diseases Caused By Basidiomycetes
Annosus Root Rot - Heterobasidion irregulare
Fruiting bodies of Heterobasidion irregulare.
Asexual spores.The asexual form has been named Spiniger (old name Oedocephalum).
A cross section from the base of a red pine with Heterobasidion root rot. Tree defenses, dark red resin, can be seen at the border between infected and sound wood.
Laminated Root Rot - Phellinus weirii and Phellinus sulphurascens
Fruiting bodies of Phellinus weirii.
Brown setae on surface of decayed wood viewed with a hand lens.
Delamination of the decayed wood often occurs at the annual rings causing the growth rings to separate.
The decay is a white pocket rot.
Young Douglas-fir trees with Phellinus root rot.
Stand Opening Disease of Spruce - Onnia tomentosa
Decay in the roots at the lower trunk.
White pocket rot caused by Onia tomentosa
Fruiting bodies of Onnia tomentosa.
Brown Root and Butt Rot of Conifers - Phaeolus schweinitzii
Fruiting bodies of Phaeolus schweinitzii.
The top of the fruiting bodies have a velvety appearance.