Ministry of Forests

Cariboo Region Research Section


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

Abstract

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 it is well established, and prevents A. ostoyae 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 dependent upon inoculation potential, not that the stump is alive. Bole removal from timber harvesting, as opposed to natural disturbances which return boles to the soil, alters the populations and inoculum potential of saprophytes that can compete with Armillaria osfoyae. 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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