Abstract
A study of the amount and types of decay in yellow birch, Betula lutea Michx. f., in Nova Scotia was undertaken in 1951 and 1952 in order to supply those concerned with information necessary for proper forest management of even-aged stands. A total of 374 trees was examined of which 35% contained some measure of decay. Volume of decay increased with increasing age. Approximately 50% of the trees contained decay at 120 to 130 years of age and 100% at 230 years of age. The loss in merchantable volume increased from a negligible amount at 60 years to about 10% at 240 years. No attempt was made to predict a rotational cut based on diameter. A pathological rotation age of 170 years is suggested for yellow birch in Nova Scotia. Ten wood-destroying fungi were found associated with rot in living trees, five in the butt and five in the trunk. Poria cocos (Schw.) Wulf. caused the most frequent butt rot and Fomes igniarius (L. ex Fr.) Gill. the most common trunk rot.
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