. [Bulletins on forest pathology : from Bulletin , Washington, , 1913-1925]. Trees; Plant diseases. â I i1 i: l. m r â .-. r-i-'i. del Sections of Pine Trees, Showing Typical Progress of Blister- Rust Infection. Fig. 1.âSection of the trunk of a young tree of Pinus strobus, showing entrance of the blister rust into the trunk from an earlier infected branch. The dark shading on the trunk indicates the visibly infected portion. X 1. Drawn by J. M. Shull. Fig. 2.â Trunk of young tree of Pinus strobvs, about 2 inches in diameter, showing (by zona- tion) the progress of the blister
. [Bulletins on forest pathology : from Bulletin , Washington, , 1913-1925]. Trees; Plant diseases. â I i1 i: l. m r â .-. r-i-'i. del Sections of Pine Trees, Showing Typical Progress of Blister- Rust Infection. Fig. 1.âSection of the trunk of a young tree of Pinus strobus, showing entrance of the blister rust into the trunk from an earlier infected branch. The dark shading on the trunk indicates the visibly infected portion. X 1. Drawn by J. M. Shull. Fig. 2.â Trunk of young tree of Pinus strobvs, about 2 inches in diameter, showing (by zona- tion) the progress of the blister rust. The disease entered the trunk from the side branch. The cracked bark (c) indicates where aecia have formed; the black spots (b) indicate the developing pycnia; the shaded part outside (a) indicates the area where the bark is discolored. X \. Drawn by R. H. Colley. Fig. 3.âA trunk 8 to 10 inches in diameter. The disease attacked the swollen twig first, then ran downward to the main branch, from which it has spread into the trunk. The latter will soon be girdled and the tree will die. Photographed by J. F. 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 : U. S. Dept. of Agriculture]
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisherwashi, bookyear1913
