Understanding and Managing Slime Flux (Wetwood) on White Oak

What Is Slime Flux?

Slime flux is a bacterial infection (wetwood) in heartwood that generates gas pressure, forcing foul-smelling, frothy sap out through bark cracks or wounds. The ooze colonizes with yeasts and fungi, becoming dark and slimy. It kills grass/plants it drips on due to high alkalinity.

No Cure, Only Management

Drain tubes are no longer recommended—they spread bacteria and invite decay fungi. There is no effective chemical control.

Supportive Care

Reduce stress: water during drought, fertilize appropriately, prune dead branches properly. Avoid wounding the tree. Mulch to protect roots. Monitor for decline; some trees live decades with wetwood.