. Bulletin of the Department of Agriculture. Agriculture; Agriculture. DEFECTS IX TIMBEB < LURED BY [NSECTS I'.') and consequently reduce the structural strength of the wood, espe- cially when cut into smaller dimensions; therefore timber having such borer holes should be used iii as large dimeii ions as Fig. 27.—Western red cedar Bhlngles badly damaged by grub boles mid burrows of flat-headed borers (Trachykele blonaeli). ' i7>. n. Quarter- sawn shingle showing both cross and longitudinal sectloi the larval mines; b. bastard-sawn Bhingle Bhowlng larval mines GRUB-HOLE IN
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. DEFECTS IX TIMBEB < LURED BY [NSECTS I'.') and consequently reduce the structural strength of the wood, espe- cially when cut into smaller dimensions; therefore timber having such borer holes should be used iii as large dimeii ions as Fig. 27.—Western red cedar Bhlngles badly damaged by grub boles mid burrows of flat-headed borers (Trachykele blonaeli). ' i7>. n. Quarter- sawn shingle showing both cross and longitudinal sectloi the larval mines; b. bastard-sawn Bhingle Bhowlng larval mines GRUB-HOLE INJURY TO LIVING TREES; A NONPREVENTABLE LOSS Grub-hole defects in living trees can not be prevented by lumber- men, since often these defects occurred many years before the tree was cut. Sometimes the insect holes are partially healed over by. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original United States. Dept. of Agriculture. [Washington, D. C. ?] : The Dept. : Supt. of Docs. , G. P. O.
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