. A text-book of mycology and plant pathology . Plant diseases; Fungi in agriculture; Plant diseases; Fungi. PLANTS AS DISEASE PRODUCERS 3" Stubs were left which never healed over and through the exposed sur- face the fungi of wood decay gained easy access. The injuries produced by meteorologic causes are important. Entire forests have been levelled by tornadoes. Cracks are produced by wind action. Lightning opens a way by cracks to the interior. Snow and ice snap off large Umbs and hail stones bruise the bark and leaves of trees so that fungi can readily enter. Chemic substances are rath
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. A text-book of mycology and plant pathology . Plant diseases; Fungi in agriculture; Plant diseases; Fungi. PLANTS AS DISEASE PRODUCERS 3" Stubs were left which never healed over and through the exposed sur- face the fungi of wood decay gained easy access. The injuries produced by meteorologic causes are important. Entire forests have been levelled by tornadoes. Cracks are produced by wind action. Lightning opens a way by cracks to the interior. Snow and ice snap off large Umbs and hail stones bruise the bark and leaves of trees so that fungi can readily enter. Chemic substances are rather exceptional destructive agents to which reference has been called. Fig. 126.- -Black walnut, Juglans nigra. Cold Spring Harbor, L. open-branch stub (July, 1914). I. Note large in a previous page. Besides these agents, it occasionally happens, that fungi enter healthy plants through diseased grafts which are inserted. Robert Hartig mentions such a graft union of diseased and healthy roots in the case of the red-rot fungus, Trametes radiciperda. Here contact of the diseased root containing the fungus with the sound one of a neighboring tree and the partial natural graft union of these two roots explains how such infection occurs. An enumeration of the way in which fungi can gain entrance to plants follows:. 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.. Harshberger, John W. (John William), 1869-1929. Philadelphia : P. Blakiston's Son & Co