Sudden Oak Death and Ash Tree Decline in Ohio

Northeast Ohio: Healthy 40-ft oak died in one summer (no drought/heat). Two large ashes died with green trunk "mold"; third ash and maples now show it.

Oak Death

Insufficient info for diagnosis. If contagious, nearby trees would show symptoms by now. Likely isolated event.

Green "Mold" = Lichens

• Symbiotic algae+fungi; produce own food (epiphytes).
• Not parasitic—slight negative effect only.
• Indicate thin canopy (effect, not cause).
• Control: Improve tree health → denser canopy shades lichens.

Ash-Specific Concern

If ashes dying in clusters (2 nearby, 1 at 150 ft), could be ash-specific disease (emerald ash borer, ash yellows, etc.). Contact Ohio Division of Forestry for on-site diagnosis: Ohio Forestry | Ash Pest Guide.

Fertilize all trees: 10-10-10 at 1 lb/inch trunk diameter.