Archive image from page 27 of Defects in timber caused by. Defects in timber caused by insects defectsintimberc1490snyd Year: 1927 26 BULLETIN 1490, U. S. DEPARTMENT OF AGRICULTURE new growth of the tree, or they may have been enlarged by carpenter ants. This type of injury can be recognized as follows: (1) In the sap wood and heart wood of hardwoods very large cir- cular holes, one-half to 1 inch in diameter, are open and but slightly stained and are usually lined with a silky yellowish-brown web 16 (Fig. 22.) (2) In sap wood or heartwood of hardwood trees the holes are darkly stained and
Archive image from page 27 of Defects in timber caused by. Defects in timber caused by insects defectsintimberc1490snyd Year: 1927 26 BULLETIN 1490, U. S. DEPARTMENT OF AGRICULTURE new growth of the tree, or they may have been enlarged by carpenter ants. This type of injury can be recognized as follows: (1) In the sap wood and heart wood of hardwoods very large cir- cular holes, one-half to 1 inch in diameter, are open and but slightly stained and are usually lined with a silky yellowish-brown web 16 (Fig. 22.) (2) In sap wood or heartwood of hardwood trees the holes are darkly stained and are open, containing little or no sawdust or f (3) In the heart- wood of butt logs of gum and a few other hardwoods, unstained holes contain mined granular and fibrous frass18 (fig. 23). (4) In the heart- wood of butt logs of softwoods, chiefly pine, very irregular holes are narrowly oval, without stain, but surrounded by much pitchy ' light- wood,' or ' fatwood.' and are very tightly packed with fine granular frass19 (fig. 24) (;'). _ (5) Pinholes or w ormlioles in soft- wood logs and lum- ber in the Northern States are caused by a melandryid timber These larvae sapwood through scars or blazes and The holes are filled with fine Fig. 28.âPowder-posted -white ash shipbuilding lumber showing larval burrows and exit holes of adults of Lyetus planicollis; board from a closely piled stack of lumber throughout â which larvae had burrowed gain entrance to the livin also attack recently felled :imber. sawdust. GRUB-HOLE INJURY TO GREEN SAW LOGS AND LUMBER; A PREVENTABLE LOSS All types of borer holes other than those mentioned above are made after the trees have been felled, and are preventable by proper methods of handling the logs. These borer holes occur in the sap- 16 This injury is found principally in oak, chestnut, locust, and cherry and is caused by the carpenter worm, Prionoxystus robiniae Peck. 17 These holes are found principally in oaks and are caused b
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