. Minnesota plant diseases. Plant diseases. 276 Minnesota Plant Diseases. are later uncovered by the splitting off of scales of the bark. Jack pine in Minnesota is very commonly afifected and the white and red pines are also though not so frequently attacked. Scotch pines in nurseries and experimental forests are some- times very seriously affected.. Fig. 136.—Pine knot (a species of I'eridermium), on Scotch pine. 1. The branch on the left is seen with a good-sized knot which is covered with the conspicuous ciusted-cup spores. The branchlets of this branch are seen to be thicker than the norma
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. Minnesota plant diseases. Plant diseases. 276 Minnesota Plant Diseases. are later uncovered by the splitting off of scales of the bark. Jack pine in Minnesota is very commonly afifected and the white and red pines are also though not so frequently attacked. Scotch pines in nurseries and experimental forests are some- times very seriously affected.. Fig. 136.—Pine knot (a species of I'eridermium), on Scotch pine. 1. The branch on the left is seen with a good-sized knot which is covered with the conspicuous ciusted-cup spores. The branchlets of this branch are seen to be thicker than the normal branches; the leaves are shorter and not as green and die early. 2. Section through a knot. 3. Section through the same branch as shown in 2, but below the knot, showing that a very great growth has been caused by the parasitic fungus in 2. Original. In view of our lack of knowledge of the life history of these forms no preventive methods of combating this disease are known. All diseased branches should be cut off and burned as soon as they are discovered. Leaf rust of pines (Species of Peridermium). This is a close relative of the stem rust of pines. It is likewise a rust fungus;. 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 work.. Freeman, Edward Monroe, 1875-. Saint Paul, Minn.