. The publications of the Pennsylvania chestnut tree blight commission, 1911-1913. ^ Original infected tree, cut and burned December, 1911.@ Secondary infected trees, cut and burned December, 1911.® Secondary infected trees, December, 1912.© Secondary infected trees, August, Healthy trees, 6 to 12 inches in (^ Figure 4. Typical small spot infection, near Dry Run, Franklin County, Pa., showingoriginal center and secondary infected trees. If all chestnut trees within 35feet of the nearest diseased tree cut in 1911 had been removed at the time of thefirst cutting, and all stum
. The publications of the Pennsylvania chestnut tree blight commission, 1911-1913. ^ Original infected tree, cut and burned December, 1911.@ Secondary infected trees, cut and burned December, 1911.® Secondary infected trees, December, 1912.© Secondary infected trees, August, Healthy trees, 6 to 12 inches in (^ Figure 4. Typical small spot infection, near Dry Run, Franklin County, Pa., showingoriginal center and secondary infected trees. If all chestnut trees within 35feet of the nearest diseased tree cut in 1911 had been removed at the time of thefirst cutting, and all stumps properly sterilized, it would have prevented theappearance of the new infections of 1912 and 1913. 77 After the tree is felled, all portions above the stump which showmycelium or pustules of the blight must be peeled of bark or theentire piece cut out. This diseased material, the brush from thetops, the bark, and portions of the felled chestnut trees which arenot peeled and which it is not intended to utilize must be burned. After the stump is peeled, if fire can be made o
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