Mushrooms on Pecan Trunk: Decay Fungi, Not a Death Sentence

That Conk Means Internal Decay—But the Tree Can Live Decades

The mushroom (conk) at the old pruning wound is the fruiting body of a wood-decay fungus. It digests only dead heartwood, not living sapwood under the bark. The tree can remain structurally sound for many years.

Why Not Fill the Cavity?

Old practice: fill with cement. Modern research shows this harms trees—rigid columns don't flex with wind, causing new wounds that invite more decay. Moisture trapped behind cement accelerates rot.

If aesthetics demand filling, use flexible polyurethane foam (professional application only). But it's unnecessary for health or stability.

Best Care for a Hollow Tree

• Annual fertilization: 1 lb 10-10-10 per inch trunk diameter, broadcast and watered in.
• Monitor for large limb failure—hollow limbs break first.
• Consult an ISA Certified Arborist for risk assessment if the tree overhangs targets.

Enjoy the tree; decay fungi are slow-acting recyclers, not killers.