STUDIES IN FOREST PATHOLOGY: XVI. DECAY OF BALSAM FIR, ABIES BALSAMEA (L.) MILL., IN THE ATLANTIC PROVINCES

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Abstract
Analyses of approximately 2600 living balsam fir, examined at seven localities in the Atlantic Provinces, established that, after adjustment for age, differences in the amount of cull existed between some of the localities. The analyses indicated that the effect of age on trees between 60 and 120 years of age is expressed mainly in the number of trees infected with decay, although in some areas it also has an effect on the amount of butt cull in infected trees. Differences in the amount of trunk cull between localities could be attributed to differences in the number of trees possessing this type of decay. No significant effect of age on the amount of trunk cull in infected trees was found in any locality, nor were there any differences in the amount of trunk cull in these trees among localities. Differences in the amount of butt cull were caused both by the number of trees infected with butt rot and by the amount of cull in infected trees. Some factors have been enumerated which require further study before the causes of such differences can be determined. It is felt that a critical study of the infection courts may disclose reasons for differences in the amount of trunk infection. Butt rot relationships appear to be more complex and an understanding of the causes of the variations encountered can be determined only after further intensive studies.

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