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Arizona Ash Bark Peeling with Black Powder: Terminal Decline Likely—Consider Replacement

Arizona ash with bark loss and black fungal growth

Diagnosis

Bark cracking/peeling + black sooty fungus underneath + leaf drop + one trunk dead = advanced decline, likely fatal. Fungus is secondary on dead wood. Cause hard to pinpoint (environmental stress combo).

Recommendation

On-site arborist exam may help, but replacement is prudent. Tree unlikely to recover.

Plant Diseases: Mountain Ash Berry Failure and Tip Dieback: Pollination and Twig Borer; Ash Tree Basal Decay: Irreversible Heartwood Rot on West Side; Manchurian Ash Decline: Multi-Factor Investigation Needed; Oak Tree Sparse Leaves, Dead Branches: Post-Drought Stress; Bonita Ash Slow to Leaf Out: Normal or Borers?; Bacterial Canker in Cherry Trees: Sap Oozing and Rapid Leaf Death; Ash Tree with Cauliflower Clusters and Peeling Bark: Need Photos; Peach Tree Limbs Turning Black: San Jose Scale Infestation; Lichens on Mountain Ash: Harmless Epiphytes, Not Disease; Why Young Arizona Ash Trees Aren't Growing Upward

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