. Bulletin of the Department of Agriculture. Agriculture; Agriculture. A STUDY OF HEART-ROT IN WESTEEN HEMLOCK. 7 This generally indicates that the largest sporophore marks the area of greatest decay and that the decay has traveled both ways. In any case^ trees bearing more than one sporophore situated some distance from each other are not merchantable and should be cut down and burned or fire-girdled. The presence of sporophores on the tree is an indication of a fairly advanced stage of decay throughout a good portion of the tree. On the other hand, the absence of sporophores does not al
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. A STUDY OF HEART-ROT IN WESTEEN HEMLOCK. 7 This generally indicates that the largest sporophore marks the area of greatest decay and that the decay has traveled both ways. In any case^ trees bearing more than one sporophore situated some distance from each other are not merchantable and should be cut down and burned or fire-girdled. The presence of sporophores on the tree is an indication of a fairly advanced stage of decay throughout a good portion of the tree. On the other hand, the absence of sporophores does not always indicate soundness. A few cases may occur where the tree is so old in decay that the sporophores have died and fallen away. The discoloration of the bark at the point of attachment or the hole left by the rotting. Fig. 4.—An old sporophore of Echinodontium tinctorium on hemlock. Top view, showing the zonation and the relation to intensive decay. branch may readily be The old sporophores, which have a remarkable resistance to decay, may be observed on the ground at the base of the tree. Pounding on the tree is a fairly accurate method of determining soundness, down to a particular stage of rot. In doubtful cases, remarkably accurate results may be obtained by pressing the ear firmly against the tree while pounding. Previous to this, the bark should be removed over a small area in order to secure an uncushioned sounding point. Probably the most practical method for the average marking ofiicer, in the absence of visible defects, is the presence of red color a half inch or so within the dead branch stubs. This reddish coloration of the rot E. tinctorium is an index of an advanced stage, and its appearance so far out on the dead branch as to be detected by merely breaking. 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 resemb
Size: 1946px × 1284px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauth, bookcentury1900, bookdecade1910, booksubjectagriculture
