. [Bulletins on forest pathology : from Bulletin , Washington, , 1913-1925]. Trees; Plant diseases. A STUDY OF TTEART-ROT IN WESTERN HEMLOCK. 13 separate plats were laid out, comprising acres. The river-bottom and slope types were first selected for investigation, for the reason that at these elevations and under the existing conditions grand fir and hemlock are heavily diseased. The plats represented a variety of age classes, mixtures, and successions. The investigations on grand fir and hemlock were carried out simultaneously, but the data on the former are reserved for a fut
. [Bulletins on forest pathology : from Bulletin , Washington, , 1913-1925]. Trees; Plant diseases. A STUDY OF TTEART-ROT IN WESTERN HEMLOCK. 13 separate plats were laid out, comprising acres. The river-bottom and slope types were first selected for investigation, for the reason that at these elevations and under the existing conditions grand fir and hemlock are heavily diseased. The plats represented a variety of age classes, mixtures, and successions. The investigations on grand fir and hemlock were carried out simultaneously, but the data on the former are reserved for a future report. The influences of site and elevation on the distribution and amount of decay were considered, and the data were consequently divided according to the two sites indicated. In order to get the percentage of rot of hemlock and grand fir, a clean cut of these species. Fig. 10.—Section through a trunk of hemlock, with an old sporophore attached. The stringy nature of the heart-rot and the grass-stubble effect due to sawing are both characteristic. was made. The trees were bucked in such lengths (16 feet and shorter) as to determine the transverse and longitudinal extent of the decay; also the point at which the decay was greatest. That section of the trunk containing the upper extension of the decay was fully dissected, in order to determine the exact upper limit. The diameter of the rot at each log end was measured and recorded. The rot in each tree was measured in detail. A full analysis of the stump was also made. A uniform stump height of 18 inches was maintained throughout. The age of the tree was determined at this point, and four years added to the age at the stump, giving the entire Before the trees were felled, full notes on the external i This average age at stump was secured by taking data on a number of seedling hemlocks in the same stand and determining the age corresponding to the stump height of the felled Please note that these images are
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