DECAY IN SUBALPINE SPRUCE ON THE ROCKY MOUNTAIN FOREST RESERVE IN ALBERTA

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Abstract
Data from 456 living subalpine spruce on six 0.1-ac. plots in the Bow River Forest in 1950 and six 0.2-ac. plots in the Crowsnest, Bow River, and Clearwater Forests in 1952 show a total of 203 separate infections of which approximately half occurred in the basal part of the trees. Most of the butt rot was associated with Polyporus circinatus var. dualis Peck, Flammula connissans Fr., and an unidentified fungus designated "Unknown C". Coniophora puteana (Schum. ex Fr.) Karst. was the fungus associated with the major portion of the brown butt rot. Among the white trunk rots, Stereum sanguinolentum Alb. & Schw. ex Fr. was the fungus most frequently isolated from infected trees and Fames pint (Thore) Lloyd was responsible for the largest, cull losses. Peniophora septentrionalis Laurila, which was isolated from Picea glauca (Moench) Voss and P. engelmannii Parry, was the third most important fungus associated with trunk rot. Trunk rots account for 70% of the decay losses while fungi producing white rots account for 93.6% of the total decay. The incidence of decay increased progressively with age at different rates for trees on "dry" and "moist" sites. The two sites are characterized by distinctive ground cover associations.

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