oak-root rot

[ ohk-root, -roo t ]
/ ˈoʊkˌrut, -ˌrʊt /

noun Plant Pathology.

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.
Also called shoestring root rot.