Wood Rot in Trees: Identifying and Managing Fungal Decay

Discovering mushrooms growing on a tree trunk or roots can be alarming. These fungal fruiting bodies signal internal decay, but not all wood rot spells immediate doom for the tree.

What Causes Wood Rot?

Dozens of fungi attack both hardwoods and conifers. When conditions suit them—moisture, wounded bark, stressed trees—they produce visible conks or mushrooms. UGA Disease Specialist Holly Thornton provides a comprehensive overview in her article "Wood Rots," which explains the biology and management options.

Assessing the Situation

Not every fungal growth requires drastic action. Some decay fungi are secondary invaders on already declining wood. However, extensive fruiting on major structural roots or the lower trunk warrants evaluation by a certified arborist.

Next Steps

• Read Thornton's "Wood Rots" guide for detailed identification.
• Monitor the tree's overall health: canopy density, leaf color, new growth.
• Consult an arborist for a risk assessment if the tree is near structures or high-traffic areas.

Early detection and professional advice are your best tools for managing wood decay.