Decay caused by infection of Fomes cajanderi Karst : in top-broken, young-growth Douglas-fir trees Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/qf85nf49j

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  • A glaze storm of exceptional severity was seen in the Corvallis area, January, 1942. The weight of ice that accumulated in the crowns of young-growth Douglas-fir trees caused widespread top breakage in many stands lying in the broad path of this storm. Early research on this phenomenon showed the majority of trees damaged in 1942 became infected with the wood rotting fungus, Fomes cajanderi Karst. Measurements of incipient decay extension made in 1978 were combined with similar measurements taken in 1953 and 1963. Analysis of these data indicated that the fungal growth rate from the point of break downward slowed over the 36-year interval since breakage. Only small amounts of decay from the point of break upward were observed. Relationships between tree characteristics and the level of incipient decay were also investigated. Diameter of the stem broken in 1942 was found to be correlated with the extent of incipient decay. Trees with larger breaks were consistently associated with greater amounts of decay in all three data groups. Foresters should find this information useful in developing management strategies for young Douglas-fir stands containing high percentages of top-broken trees.
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