Bark loss with white chalky residue on a white oak suggests water trapped between co-dominant trunks has caused internal rot. This is a structural hazard. Consult a certified arborist immediately—do not park under the tree.

Oak Trunk Green/White Growth: Lichens, Not Disease
White Oak Progressive Branch Dieback: Internal Decay Suspected
White Oak Suckering and Gall Wasps: Normal Self-Pruning, Galls Cosmetic—Imidacloprid Ineffective
Lightning Strike on Oak: Assessment and Care
Why Oak Trees Shed Bark: Natural Growth or Smooth Patch Disease
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