Decay Fungus Conk on Post Oak: Natural and Manageable

What It Is

White, brain-coral-like growth on dead branch = fruiting body (conk) of wood-decay fungus. Spores spread fungus; conk itself is harmless.

What It Means

• Fungus is inside dead heartwood.
• Does not kill living tree.
• Over decades, may hollow trunk/limbs.
• First sign of trouble: large hollow limbs breaking.

Management

• Fertilize: 10-10-10 at 1 lb/inch DBH early spring.
• Water: 1 inch/week during drought (pan method).
• Monitor: Watch crown for dead/hollow limbs.
• No conk removal needed—doesn't stop fungus.

Outlook

Healthy tree compartmentalizes decay. With care, decades of life remain.