. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 14 BULLETIN 255, U. S. DEPARTMENT OF AGRICULTURE. This has to be borne by future generations, just as the present is paying for the damage inflicted by the insect a century or more in the past. Actual tally of sesiid wounds, blazes, bullet wounds, bruises by blasting, etc., all of which cause blister effects in wood tissue, was. Fig. 8.—An embryo pitch seam caused by the Douglas fir pitch moth only a few years after emergence of moth : A, Pitch blister which the larvae caused before emerging; H, a break in the tissues
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 14 BULLETIN 255, U. S. DEPARTMENT OF AGRICULTURE. This has to be borne by future generations, just as the present is paying for the damage inflicted by the insect a century or more in the past. Actual tally of sesiid wounds, blazes, bullet wounds, bruises by blasting, etc., all of which cause blister effects in wood tissue, was. Fig. 8.—An embryo pitch seam caused by the Douglas fir pitch moth only a few years after emergence of moth : A, Pitch blister which the larvae caused before emerging; H, a break in the tissues by wind strain on account of the defect; C, break filling with pitch ; D, inclosed pitch from pitch tube which caused imperfect heal- ing; E, parts of pitch tube which covered the larvse, still part of the surface covering. Reduced. (Original.) made in a stand of Douglas fir about 30 years old, where conditions were most favorable for the operation of all the latter causes. This tally demonstrated that in this area of about 30 acres the sesiid wounds averaged, up to 15 feet from the ground, a little over 96 per cent, while the wounds from all other causes combined represented less than 4 per cent. Wounds above 15 feet could safely be consid-. 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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