. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 8 BULLETIN 111, U. S. DEPARTMENT OF AGRICULTURE. SECONDARY INJURY BY FIRE. About one-half of 1 per cent of the trees infested by Vespamima sequoia is killed. In case of a slight surface nfeiti places where, out- side of humus, no litter covers the ground, all the infested trees which are not killed outright come through it with the bark on the sides where the pitch exudation is located literally cooked, and for the balance of their existence they display the "fire wounds" (fig. 5), of which the pitch moth was
. Bulletin of the Department of Agriculture. Agriculture; Agriculture. 8 BULLETIN 111, U. S. DEPARTMENT OF AGRICULTURE. SECONDARY INJURY BY FIRE. About one-half of 1 per cent of the trees infested by Vespamima sequoia is killed. In case of a slight surface nfeiti places where, out- side of humus, no litter covers the ground, all the infested trees which are not killed outright come through it with the bark on the sides where the pitch exudation is located literally cooked, and for the balance of their existence they display the "fire wounds" (fig. 5), of which the pitch moth was the primary cause. They remain green but add little to their size annually. Subsequent fires fell them. Fig. 5.—Fire wounds on pine tree injured by the Sequoia pitch moth. (Original.) readily, and their burning injures and kills perfectly healthy trees, which would otherwise have remained unscathed. There is abundant proof in the area under discussion that unat- tacked trees, on ground not littered with fallen timber, pass through surface fires with but slight injury. Thousands of such trees are mingled with as many which display "fire wounds" and the tunnel of Vespamima burned indelibly into the base of the latter, thus explain- ing why it is that some trees are half burned while others, under the same conditions and at the same place, have escaped with scarcely a 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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