. [Bulletins on forest pathology : from Bulletin , Washington, , 1913-1925]. Trees; Plant diseases. 14 BULLETIN U. S. DEPARTMENT OF AGRICULTURE. agencies, such as fungi, mistletoes, smoke, frost, wind, and snow injury, their outward recognition, and their possible and actual dam- age to the trees. Sample plats of small dimensions can often be resorted to in order to ascertain the extent of a heart-rot in a certain age class. Borings can be made with an increment borer on a few sample trees and thus the kind of rot and in the case of butt rots the extent of decay can be determined.
. [Bulletins on forest pathology : from Bulletin , Washington, , 1913-1925]. Trees; Plant diseases. 14 BULLETIN U. S. DEPARTMENT OF AGRICULTURE. agencies, such as fungi, mistletoes, smoke, frost, wind, and snow injury, their outward recognition, and their possible and actual dam- age to the trees. Sample plats of small dimensions can often be resorted to in order to ascertain the extent of a heart-rot in a certain age class. Borings can be made with an increment borer on a few sample trees and thus the kind of rot and in the case of butt rots the extent of decay can be determined. Soundings on the trunk, the presence of sporophores, the number of dead branches or in-. Fig. 15.—Fomes annosus, root Fomes. Typical fruiting bodies. juries, and the presence of the unmistakable swells and pitch flows occurring at old branch whorls all aid in the determination of the presence and extent of decay within a tree. The amount of decay bears a certain relation to the age of a stand, becoming greater as the stand grows older. Owing to this fact, a table similar to the cull table given on page 25 of the Reconnaissance Manual of District 1, United States Forest Service, but giving the rot percentage only for a range of age classes for each tree species would prove of value in judging the decay in the stand. Such a table would give a range in rot percentages to be. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington : U. S. Dept. of Agriculture]
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