Archive image from page 12 of Defects in timber caused by. Defects in timber caused by insects defectsintimberc1490snyd Year: 1927 fc-'5' fi ' grease spots ' (West Vir- ginia), and 'flag worm'' (Arkansas). The holes usually occur in the best part of the wood, either one in a place, or two or more in a row. This de- fect is so prevalent in ma- ture white oak and other oaks that it is often diffi- cult to find a tree the wood of which is entirely free from it; in yellow poplar the defect is not so com- mon. When the defect does occur in whitewood or yellow poplar the ac- companying long, black
Archive image from page 12 of Defects in timber caused by. Defects in timber caused by insects defectsintimberc1490snyd Year: 1927 fc-'5' fi ' grease spots ' (West Vir- ginia), and 'flag worm'' (Arkansas). The holes usually occur in the best part of the wood, either one in a place, or two or more in a row. This de- fect is so prevalent in ma- ture white oak and other oaks that it is often diffi- cult to find a tree the wood of which is entirely free from it; in yellow poplar the defect is not so com- mon. When the defect does occur in whitewood or yellow poplar the ac- companying long, black, greenish or bluish streaks give a calico effect, and the wood is called ' calico pop- lar ' (fig. 2) (23,27). The same defect occurs in beech, birch, basswood. maple, and elm in West Virginia, elm and oak in Michigan, oak in Arkan- sas, and chestnut in Ten- nessee. Calico poplar and oak might be used, when avail- able in sufficient quantity, as a special grade for in- terior natural-wood finish, as the effect is pleasing. Thus the apparently limited quantity could be utilized without hav- ing its value depreciated much below that of the first and second grades. This defect causes a serious loss to stave and shingle stock. In Arkansas from 30 to 40 per cent of white oak Bourbon whisky-barrel- stave stock and staves has often been left to rot in the woods on account of injury by the oak timber worms and ambrosia beetles. Fig. 10. -Pinholes made by Xyleborus sp. in green chestnut board, after piling 2 Corthylus columbianus Hopkins.
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