. Bulletin of the Department of Agriculture. Agriculture; Agriculture. DOUGLAS FIR PITCH MOTH. 11 laths, cr firewood. Therefore to illustrate them adequately it would be necessary to split tree trunks, often for the length of several logs, to show a side view of an entire seam, and even if this were accom- plished successfully the result would be merely something like a board which had been split and had been loosely stuck together again. With the exception of figure 2, showing the evolution of. Fi<j. 5.—Wound caused by the Douglas fir pitch moth. Photographed soon after emergence of m
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. DOUGLAS FIR PITCH MOTH. 11 laths, cr firewood. Therefore to illustrate them adequately it would be necessary to split tree trunks, often for the length of several logs, to show a side view of an entire seam, and even if this were accom- plished successfully the result would be merely something like a board which had been split and had been loosely stuck together again. With the exception of figure 2, showing the evolution of. Fi<j. 5.—Wound caused by the Douglas fir pitch moth. Photographed soon after emergence of moth. Natural size. (Original.) the pitch scam, the photographs used to illustrate the injury to Douglas fir by pitch-moth infestation are from material from which the insert emerged so recently that the cause of the wounds is obvious. Such injury within the tissues of a coniferous tree is never eliminated in the course of years, but rather becomes accentuated when the split of the tissues is later extended for the length of many feet by mechanical 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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