If your tree is leaking brown liquid, it is often a symptom of a condition known as bacterial wetwood, also sometimes called "slime flux."
Bacterial wetwood is a common issue where bacteria infect the internal wood of the tree, causing fermentation. This process produces gasses and liquids under pressure.
Understanding Bacterial Wetwood
According to sources like the provided reference, Bacterial wetwood occurs most frequently on certain tree species, such as:
- Elms
- Maples
- Poplars
- Oaks
- Birches
While these trees are most commonly affected, it can occur on other trees as well.
The Leakage Explained
The pressure from the fermentation inside the tree forces the liquid out through cracks, wounds, or pruning cuts in the bark. This leaking liquid:
- Discolors the bark: Leaving dark streaks as it flows down the trunk or branches.
- Drips onto the surrounding ground: Creating a wet, often slimy area.
- May have an unpleasant odor: Due to the bacterial activity.
The reference states that affected trees may leak copious amounts of liquid out of their trunks or branches, discoloring the bark and dripping onto the surrounding ground. This aligns directly with the symptom of a tree leaking brown liquid.
What Does the Leaking Liquid Indicate?
The brown liquid is often a mixture of the fermented sap, bacteria, and other substances from inside the tree. While the wetwood itself doesn't usually kill the tree directly, it can weaken it and attract insects. The constant moisture on the bark can also inhibit healing of wounds.
What to Do
If you observe your tree leaking brown liquid:
- Identify the location: Note where the liquid is coming from (trunk, branch, specific wound).
- Avoid collecting the liquid: It contains bacteria and can be smelly.
- Do not try to seal the wound: Sealing can trap the liquid and pressure inside, potentially worsening the issue. Allowing it to drain is often the best approach for the tree.
- Maintain tree health: Ensure the tree is well-watered and properly mulched to reduce stress, which can help the tree manage the condition.
- Consult an Arborist: A professional arborist can diagnose the issue definitively and recommend management strategies, especially if you are concerned about the tree's long-term health. They can assess the severity and provide tailored advice.
While the sight of leaking brown liquid can be alarming, bacterial wetwood is a common condition that many trees live with for years.
