Large Fungus at Base of Pecan Tree: Cut or Keep?

Ganoderma or Similar Decay Fungus on Mature Pecan

A homeowner has a mature pecan with an 18-inch diameter mushroom/conk at the trunk base. Advised to remove the tree for "root rot," but the canopy looks fine except minor tip dieback.

What the Conk Indicates

The mushroom is the fruiting body of a wood-decay fungus (likely Ganoderma or Armillaria) rotting the heartwood. Living sapwood and cambium are unaffected. The tree can remain structurally sound for many years.

Do Not Cut Based Solely on the Conk

• Decay progresses slowly in healthy trees.
• First warning signs: large limbs breaking, revealing hollow centers.
• Canopy thinning, early leaf drop, or reduced nut production signal advancing decline.

Recommended Management

• Annual fertilization: 10-10-10 at 1 lb per inch trunk diameter, broadcast and watered in. Do now and again in spring.
• Deep watering during drought: 1 inch/week.
• Mulch: 3 inches to drip line.
• Annual arborist inspection: Monitor for structural weakness.

When Removal Becomes Necessary

If a certified arborist confirms extensive decay compromising structural integrity, or if the tree poses a clear hazard to high-value targets, plan removal. Otherwise, enjoy the tree.