Reddish Growth on Storm-Damaged Oak Branches: What Is It?

After a storm breaks oak branches, you may notice a reddish-brown, gummy, elongated growth on the dead wood. This is most likely a wood-decay fungus—a type of mushroom—that colonizes dead or dying branches. It is generally benign and does not threaten the living tree.

What to Know

• The fungus appears on dead wood, often branches already dead before the storm.
• It is typically reddish-brown, stiff, and longer than wide.
• Oak trees naturally shed upper branches; storms simply bring them down.
• Most oaks have few serious pests or diseases. Water oaks are shorter-lived but still not harmed by this fungus.

Recommended Actions

No treatment is needed for the fungus itself. However, if the storm left large wounds on the trunk or major limbs, consider applying tree wound paint to deter borers. Ensure the tree has room for root flare development—avoid piling soil or building near the base.

If you're unsure, send a clear photo to an extension agent or certified arborist for confirmation. But in most cases, this is a natural, harmless occurrence.