Stereum and Allied Genera of Fungi in the Upper Mississippi Valley (Classic Reprint)

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Excerpt from Stereum and Allied Genera of Fungi in the Upper Mississippi ValleyProbably the best known disease caused by a species of Stereum is silver leaf. This disease has been studied thoroughly by Brooks and his associates (1911, 1913, 1919, 1923, 1926, 1929, 1931a, 1931b), and there is no doubt that it is caused by S. Purpureum. Silver leaf disease is especially prevalent among woody Rosaceae, particularly plums and apples. The fungus enters the host through wounds, causes a silverlike appearance of the leaves, kills the branches in the immediately vicinity of its entry, and ultimately causes the death of the tree. Although the pathogen may be obtained in culture from the tissues of the host at any time after it has become established, pro duction of basidiocarps does not occur until at least some tissues of the host have been killed, the basidiocarps developing only from dead wood. Many reports have been made of this disease on_ plums, apples, peaches, and cherries, and it has also been reported on raspberry canes (brien and Atkin son, on apricots (coombe, on cherry-laurel [prunus lauro cerasus L.] (beaumont, and on Cotoneaster melanocarpa Lodd., Crataegus sanguinea Pall., and Sorbus hybria'a L. (j erstad, Reports of the pathogenicity of S. Purpureum on hosts in families other than the Rosaceae have also been made. Beaumont for example, reported silver leaf disease of black and red' currant and gooseberry, all in the Grossulariaceae. The disease has rarely been found in the United States, except in the Pacific Northwest. Sprague and Hord (1950) found it to be very common in parts of Washington following injury to apple trees during the severe winters of 1948 - 49 and 1949 - 50. Berkeley (1930) reported the disease on apples in Canada, and Wehmeyer (1950) has cited reports in the Canadian Plant Disease Survey both from apple and cherry.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.