Decay in Young Grand Fir
Authors: Maloy, Otis C.; Gross, Henry L.
Source: Journal of Forestry, Volume 61, Number 11, 1 November 1963 , pp. 850-853(4)
Publisher: Society of American Foresters
Abstract:A dissection study of 227 Abies grandis trees ranging in age from 15 to 90 years revealed that scars and dead tops are important entry points for decay fungi. These infection courts may eventually become obscured by subsequent growth of the tree and the development of decay. Dead branches, often mentioned as infection courts, were associated with only 6 percent of the total rot columns. Advanced decay, which was separated from incipient decay by color and texture of the wood, was present in trees as early as 20 years of age but the incidence of infection increased markedly between the ages of 40 and 60 years. It is assumed that the trunk rot encountered was caused by Echinodontium tinctorium but lack of isolation and cultural evidence does not exclude the presence of other decay fungi. In addition to trunk rot, a butt rot associated wth Armillaria mellea was found in some trees which were vigorous and had thrifty crowns, contrary to a common opinion that A. mellea primarily attacks weakened or unthrifty trees.
Document Type: Journal Article
Affiliations: Research Assistant, State University College of Forestry at Syracuse University, N. Y.
Publication date: November 1, 1963
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