. Clitocybe root rot of woody plants in the southeastern United States. Root rots Southern States; Woody plants Diseases and pests Southern States. CLITOCYBE ROOT ROT OF WOODY PLANTS 9 The mycelial sheets that develop under the bark are coextensive with the lesions (fig. 4). In certain species of Australian pine trees the basal girdling by root rot frequently stimulates a pronounced hypertrophy of the trunks im- mediately above the girdled parts. Stone-fruit trees, such as peach, plum, and Carolina laurelcherry, commonly develop more or less gum formation in the cambial region, which may be so
. Clitocybe root rot of woody plants in the southeastern United States. Root rots Southern States; Woody plants Diseases and pests Southern States. CLITOCYBE ROOT ROT OF WOODY PLANTS 9 The mycelial sheets that develop under the bark are coextensive with the lesions (fig. 4). In certain species of Australian pine trees the basal girdling by root rot frequently stimulates a pronounced hypertrophy of the trunks im- mediately above the girdled parts. Stone-fruit trees, such as peach, plum, and Carolina laurelcherry, commonly develop more or less gum formation in the cambial region, which may be so copious as to exude through cracks in the Figure 4.—Large guava tree dying from root rot. Dead bark has been cut away on basal lesion to show extent to which mycelium has spread up trunk. When the bark of roots attacked by Clitocybe root rot is peeled off, the mycelium of the fungus is seen to have developed between the bark and the wood (fig. 5) and also through the inner layers of the bark. This varies from thin, filmy wefts to leathery sheets that are white when freshly developed but become cream- to chamois-colored with age. The mycelial sheets often shoiv a more or less radiating, fan- shaped type of development, but this feature is less conspicuous than usually occurs with Armillaria mellea and is less apparent in old, compact mycelial sheets. When especially favorable soil moisture conditions induce an unusually luxuriant growth, the advancing mar- 891856—50 2. 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 Rhoads, Arthur S. (Arthur Stevens), 1893-. Washington, D. C. : U. S. Dept. of Agriculture
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