Silvery Scurf
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Spondylocladium atrovirens on potato. These two mummied tubers grown in the West (around 1916) show the results of the disease, particularly the silvery, wrinkled surface, and protruding stromae.

One negative, Ortho film, ray filter not used. 1920.

Image: W. Fisher. Copyright © Dept. of Plant Pathology, Cornell University
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