Ministry of Forests

Cariboo Region Research Section

Hypholoma fasciculare, woody debris and root disease cause by Armillaria ostoyae

Hypholoma fasciculare (Huds. Ex Fr.) Kummer is confirmed in its ability to overrun Armillaria ostoyae (Romagn.)  Herink in culture.  H. fasciculare displaces A. ostoyae from discs of tree root where A. ostoyae is well established, and prevents A. ostoyaeI from occupying root segments when both fungi are introduced simultaneously.  A simple method for inoculating H. fasciculare into stumps is described and data supporting successful field inoculations are presented.  The ability of H. fasciculare to invade freshly killed stumps, even those occupied by Armillaria, is demonstrated and it is speculated that the ability of this saprophyte to invade fresh stumps is dependent upon inoculation potential of the saprophyte.  Bole removal from timber harvesting, as opposed to natural disturbances which return boles to the soil, alters the populataions and inoculum potential of saprophytes that can compete with Armillaria ostoyae.  Forest management practices that maintain vigorous saprophyte communities in the forest floor and soil, may have potential for combating Armillaria root disease.

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