Young-growth western hemlock stand infection by Heterobasidionannosum 11 yearsm after precommercial thinning

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Abstract
Infection level and course of spread of Heterobasidionannosum (Fr.) Bref, in a 26-year-old western hemlock(Tsugaheterophylla (Raf.) Sarg.) stand, precommercially thinned 11 years previously, was determined. Impact of infection on height and radial growth of western hemlock was also examined. Tree infection increased from a mean of 8% initially, to an average of 90% in the residual trees. Stump colonization accounted for 61% of the tree infection by H.annosum, with stumps within 61 cm of the remaining trees providing most of the inoculum. The fungus also entered through animal damage wounds. Growth rate of H. annosum was estimated at 75 cm/year with a range of 23–128 cm/year. Although there was no significant difference between infected and uninfected trees in height or radial growth, infected trees had less height and slightly more radial growth than uninfected trees.

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