Archive image from page 28 of Defects in timber caused by. Defects in timber caused by insects defectsintimberc1490snyd Year: 1927 woods, after the of February in Gulf States, or after the 1st of April farther north. Other preventive measures include: Rapid utiliza- tion ; submergence of logs in water, where they will not be at- tacked, and working them up as soon as re- moved from the water; sun-curing, with or without the bark on (care should be taken to provide against ex- cessive checking) ; and removal of bark strips from freshly sawn ma- terial. The damage can often be prevented by pee
Archive image from page 28 of Defects in timber caused by. Defects in timber caused by insects defectsintimberc1490snyd Year: 1927 woods, after the of February in Gulf States, or after the 1st of April farther north. Other preventive measures include: Rapid utiliza- tion ; submergence of logs in water, where they will not be at- tacked, and working them up as soon as re- moved from the water; sun-curing, with or without the bark on (care should be taken to provide against ex- cessive checking) ; and removal of bark strips from freshly sawn ma- terial. The damage can often be prevented by peeling the bark (both outer and inner) from the logs or bolts, timbers, or edges of lumber, as the bark offers a favorable place under which the in- sects' can lay eggs. Both the outer and inner bark of sawn timber should always be carefully removed and the timbers placed where they will season rapidly (1). DEFECTS CLASSED AS POWDER POST Powder post is indicated by holes from one-sixteenth to one-fourth of an inch in diameter, in the surface of the wood, in the sapwood and Fig. 29.—Powder-posted sapwood oak veneer laid on a core of chestnut (door stock) ; work of Lyctus plani- collis. Note that the heartwood oak and the chestnut have not been attacked 21 The principal injury of this character found in pines, spruces, and firs is caused by the pine sawyers, Monockamus spp. (fig. 25) (50) ; the loss due to pine sawyers in green logs and storm-felled timber is often as high as 35 per cent. In ash the defects are caused by the banded and red-headed ash borers, Neoclytus capraea Say and erythrocepha- lus Fabricius; in hickory by the banded hickory borer, Oyllen-e pietus Drury, and the red-headed ash borer ; in locust by the locust borer, Cyllene roMniae Forster : in cedar by the round-headed borer Callidium antennatnm Newm. (fig. 26) ; in cypress, western redwoods, and cedars by flat-headed borers, Trackykele spp. Burrows made by Trachykele are tightly packed with pellets of excr
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