. Defects in timber caused by insects. Wood; Forest insects. DEFECTS I2T TIMBER CAUSED BY INSECTS 33 stock, all the bark and edgings should be removed; treatment with shellac or wax will also prevent the adult beetles from boring into the wood to lay eggs. POWDER POST CAUSED BY ROUND-HEADED BORERS (CERAMBYCIDAE) Holes about one-eighth of an inch in diameter, tightly packed with finer frass, in the sapwood or heartwood of oak and hickory, are made by the flat. i*yf 'j*PW|L powder-post It attacks both freshly cut and seasoned timbers and continues to work for a number of years. Damage
. Defects in timber caused by insects. Wood; Forest insects. DEFECTS I2T TIMBER CAUSED BY INSECTS 33 stock, all the bark and edgings should be removed; treatment with shellac or wax will also prevent the adult beetles from boring into the wood to lay eggs. POWDER POST CAUSED BY ROUND-HEADED BORERS (CERAMBYCIDAE) Holes about one-eighth of an inch in diameter, tightly packed with finer frass, in the sapwood or heartwood of oak and hickory, are made by the flat. i*yf 'j*PW|L powder-post It attacks both freshly cut and seasoned timbers and continues to work for a number of years. Damage can be pre- vented by prompt han- dling of the logs, re- movel of the bark, and disposal of infested stock. Oval holes about one- fourth of an inch in diameter or irregular burrows tightly packed with coarse, powdery frass, in the heartwood and sapwood of ash, are caused by a round- headed (Figs. 33 and 34.) This in- sect attacks only freshly cut timbers, but when infested logs are stored the borers continue to work for several j7ears Prompt utilization, submerging the logs in the mill pond, rapid seasoning, or removal of the bark will pre- vent this defect. Tim- ber should be felled in the late fall or winter, so that the bark may dry somewhat and be less attractive to the beetles when they are flying and depositing their eggs early in the spring. In the Gulf States logs should not be allowed to lie in the woods at any time for more than two to three weeks, or after the 1st of April farther north, nor should they be "*1 .«"•*. — ; Fig. 36.—Ring distortions in balsam caused by tbe spruce bud worm. Base of tree attacked in 1911 showed accelerated growth for two years, followed by retardation and incomplete ring in 1918 (X), and rapid recovery later. (J/S) Smodicum cuciijiforme Say. -'6 Xcoclytus capraea Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appear
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Keywords: ., bookcentury1900, bookdecade1920, bookpublisherwa, booksubjectwood
