Archive image from page 11 of Defects in timber caused by. Defects in timber caused by insects defectsintimberc1490snyd Year: 1927 10 BULLETIN' 1490, U. S. DEPARTMENT OF AGRICULTURE in the surrounding wood. In the latter case, the injury is caused by the larvae or grubs (young) of the beetles. PINHOLE DEFECTS FORMED IN LIVING TREES; A NONPREVENTABLE LOSS When pinhole defects occur in the living tree, it is of course im- possible for the lumberman to prevent the injury, since the holes < Fig. 9.—Pinholes with short stain streaks made in green ash lumber by Platypus compositus have been

- Image ID: W22DTW
Archive image from page 11 of Defects in timber caused by. Defects in timber caused by insects defectsintimberc1490snyd Year: 1927 10 BULLETIN' 1490, U. S. DEPARTMENT OF AGRICULTURE in the surrounding wood. In the latter case, the injury is caused by the larvae or grubs (young) of the beetles. PINHOLE DEFECTS FORMED IN LIVING TREES; A NONPREVENTABLE LOSS When pinhole defects occur in the living tree, it is of course im- possible for the lumberman to prevent the injury, since the holes < Fig. 9.—Pinholes with short stain streaks made in green ash lumber by Platypus compositus have been
Bookive / Alamy Stock Photo
Image ID: W22DTW
Archive image from page 11 of Defects in timber caused by. Defects in timber caused by insects defectsintimberc1490snyd Year: 1927 10 BULLETIN' 1490, U. S. DEPARTMENT OF AGRICULTURE in the surrounding wood. In the latter case, the injury is caused by the larvae or grubs (young) of the beetles. PINHOLE DEFECTS FORMED IN LIVING TREES; A NONPREVENTABLE LOSS When pinhole defects occur in the living tree, it is of course im- possible for the lumberman to prevent the injury, since the holes < Fig. 9.—Pinholes with short stain streaks made in green ash lumber by Platypus compositus have been made periodically, and often many years before the tree was cut. The dates when the injury was done can be determined by counting the annual rings of tree growth. Usually the wood surrounding pinholes of this type is stained. PINHOLES IN LIVING TREES CAUSED BY AMBROSIA BEETLES Pinholes are uniform in size, one-eighth of an inch in diameter or smaller (to one twenty-fifth inch), either darkly stained or un-