Tulip Poplar Slime Flux: Wetwood Management

Case

Tall tulip poplars: wet line down trunk from 20 ft up. Wife concerned. Tree 15–20 yrs old.

Diagnosis: Slime Flux (Wetwood)

• Bacterial disease: fermentation in heartwood → gas pressure → sap forced out cracks/wounds.
• Common in: oak, elm, maple, tulip poplar, willow, others.
• Not usually serious if tree otherwise healthy.
• Triggers: heat, drought, stress.

Symptoms

• Colorless/tan → darkens in air.
• Foul/alcoholic smell (yeast colonization).
• Insects attracted.
• Grass killed below flow.
• May stop spontaneously.

Management (Do No Harm)

• No cure/prevention.
• Do not install drain tubes (outdated: spreads bacteria, invites decay fungi).
• Remove loose/dead bark in flux area → let dry.
• No wound dressings.
• Maintain vigor: water, fertilize, prevent wounds.

More damage done trying to "fix" slime flux than the flux itself. Leave it alone; support tree health.