. Minnesota plant diseases. Plant diseases. 54 Minnesota Plant Diseases. individual, formed by the partnership of a fungus and certain branches of the host, and living at least partially as a parasite upon the remainder of the host plant. It behaves as does a par- asitic mistletoe plant and is not unlike it in appearance. Most of the witches'-brooms of Minnesota trees are due to rust fungi. One of the most common is the birds-nest broom upon red. Fig. 24.—Witches'-broom on white spruce, caused by a mistletoe (Razoumofskya pusilla). The spruce is badly affected. Numerous brooms are seen below a
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. Minnesota plant diseases. Plant diseases. 54 Minnesota Plant Diseases. individual, formed by the partnership of a fungus and certain branches of the host, and living at least partially as a parasite upon the remainder of the host plant. It behaves as does a par- asitic mistletoe plant and is not unlike it in appearance. Most of the witches'-brooms of Minnesota trees are due to rust fungi. One of the most common is the birds-nest broom upon red. Fig. 24.—Witches'-broom on white spruce, caused by a mistletoe (Razoumofskya pusilla). The spruce is badly affected. Numerous brooms are seen below and the whole upper part of the tree is broomed. (See also Fig. 25 and F"ig. 101.) Photograph by author. cedars. These brooms occur in great numbers in many parts of the state and look like crows' nests in the distance. The branches are very numerous and the broom stands on a lateral branch like an independent plant. The leaves are not like the. 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.