Forest Investment Account

Abstract of FII Project R04-008

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Impacts of Armillaria Root Disease on Stand Productivity in the Southern Interior

Author(s): Cruickshank, Mike (Canadian Forest Service)
Subject: Ecology, Forestry, Pathology, Silviculture/Forest Management Systems
Series: Forest Investment Account (FIA) - Forest Science Program


The primary objective of this ongoing project is to quantify the growth loss attributable to sub-lethal Armillaria infection in Douglas-fir plantations in the southern interior. New and existing data will be used to derive and update Armillaria-specific operational adjustment factors (OAFs) for TIPSY, and to adapt the root disease model ROTSIM for Armillaria in TASS. Trees in plots are removed from the soil. For a sample of 150, root systems are mapped and examined for root infections, stem discs are taken for volume determination, crown characteristics are measured, and the age at infection of all lesions is determined. Results to date indicate that the volume of individual diseased trees was 35% less than that of healthy ones, stand level losses were 7-10 % in five stands, and compensatory growth on trees with diseased neighbours did not occur. First approximation OAFs were derived and results are being extended to clients

For further information, please contact Mike Cruickshank, Canadian Forest Service (

Updated September 08, 2005 

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