Heterobasidion irregulare, Phellinus weirii, Onnia tomemtosa and Phaeolus schweinitzii

Root Diseases Caused By Basidiomycetes

Annosus Root Rot - Heterobasidion irregulare


Basidiocarp of Heterobasidion irregulare 


Asexual spores.The asexual form has been named Spiniger (old name Oedocephalum).

Laminated Root Rot - Phellinus weirii


Basidiocarp of Phellinus weirii. 


Brown setae on surface of decayed wood.

Delamination of the decayed wood often occurs at the annual rings causing the growth rings to separate.


Young Douglas-fir trees with Phellinus root rot.

Stand Opening Disease of Spruce - Onnia tomemtosa

Decay in stump of infected spruce.

Fruiting body of Onnia tomentosa.

Brown Root and Butt Rot of Conifers - Phaeolus schweinitzii

Basidiocarp of Phaeolus schweinitzii.