. Diseases of economic plants. Plant diseases. TREES AND TIMBER 439 vated perithecia, the cluster surrounded by a border of dead tissue. Premature defoliation results. The disease is very abundant in all parts of the United States. In- fected materials should be burned in the fall. Powdery mildew, uncinulose. See oak. Powdery mildew, phyliactinose. See oak, FILBERT. See hazel. FIR Rust (Aecidium elatinum All). & Schw.). — This cluster-cup fungus has been noted in ;^ It produces bushy distortions, 'Svitches' brooms," by causing profuse branch- ing of the affected part of
. Diseases of economic plants. Plant diseases. TREES AND TIMBER 439 vated perithecia, the cluster surrounded by a border of dead tissue. Premature defoliation results. The disease is very abundant in all parts of the United States. In- fected materials should be burned in the fall. Powdery mildew, uncinulose. See oak. Powdery mildew, phyliactinose. See oak, FILBERT. See hazel. FIR Rust (Aecidium elatinum All). & Schw.). — This cluster-cup fungus has been noted in ;^ It produces bushy distortions, 'Svitches' brooms," by causing profuse branch- ing of the affected part of the tree. These abnormal branches soon lose their leaves, and cluster cups are produced upon them. The brooms are perennial and increase in size each year, in some cases largely covering a whole tree with the brooms. In such cases the trees are stunted and may even be killed. Infection may be reduced by destruction of the spore-bearing branches. Canker (Dasyscypha resinaria (Ckle. & Phill.) Rehm).— Swollen cankers occur in the stems and branches, even girdling the main trunk and killing the tree. After the 1 Freeman, E. M., Minn. Plant Dig., p. Fig. 192.—Elm leaf-spot. After 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 Stevens, Frank Lincoln, 1871-1934; Hall, John Galentine, 1870-. New York, Macmillan
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