Heterobasidion irregulare, Phellinus weirii, Onnia tomemtosa and Phaeolus schweinitzii

Root Diseases Caused By Basidiomycetes

Annosus Root Rot - Heterobasidion irregulare

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Basidiocarp of Heterobasidion irregulare 

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


Laminated Root Rot - Phellinus weirii

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Basidiocarp of Phellinus weirii. 

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Brown setae on surface of decayed wood.

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

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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.