. Minnesota plant diseases. Plant diseases. Chapter XIX. Diseases of Garden Crops. Orange- or red-rust of raspberries and blackberries [Gyw- noconia interstitialis (Schlcct.) Lagh.]. This rust is chiefly known on account of the destruction occasioned by the cluster-cup stages, on the raspberries, blackberries and their allies. The cluster-cup stage differs from that of most of our common rusts by the absence of a cluster-cup wall, so that the chains of spores are spread out on the surface of the leaves. These spores are pro- duced in great numbers in early summer and late spring and form what
. Minnesota plant diseases. Plant diseases. Chapter XIX. Diseases of Garden Crops. Orange- or red-rust of raspberries and blackberries [Gyw- noconia interstitialis (Schlcct.) Lagh.]. This rust is chiefly known on account of the destruction occasioned by the cluster-cup stages, on the raspberries, blackberries and their allies. The cluster-cup stage differs from that of most of our common rusts by the absence of a cluster-cup wall, so that the chains of spores are spread out on the surface of the leaves. These spores are pro- duced in great numbers in early summer and late spring and form what is common- ly known as the. Fig. ]60.—Orange rust of raspberry and blackberry; to the right on a leaf of wild blackberry; to the left a normal unattacked leaflet. Original. orange rust. The rust is produced on the under sur- face of the leaf, and wild and cultivated raspberries, dew- berries and blackberries suffer. The spores fall in a dense orange powder. From golden orange, the lower surface of. 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 Freeman, Edward Monroe, 1875-. Saint Paul, Minn.
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