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oak-root rot

[ohk-root, -roo t]
noun Plant Pathology.
  1. a disease of oaks and other trees and woody plants, caused by the fungus Amillariella mellea (oak-root fungus), the fruiting body of which is the honey mushroom, and characterized by rotting roots, girdling of crown, and eventual death of the tree.
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Also called shoestring root rot.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018