What Causes White Fungus on Tree Trunks in Shreveport?

In Shreveport and Northwest Louisiana, white fungus on tree trunks is primarily caused by a disease known as Hypoxylon canker.

This fungal infection is typically triggered by periods of intense tree stress, such as:

• Prolonged drought: Extended dry spells weaken the tree’s natural defenses.
• Construction damage: Activities that cause root damage, soil compaction, or grading nearby can activate latent infections.

### How to Identify It The disease is characterized by the tree shedding patches of its bark, which reveals a crusty white or grayish fungal surface (spore mats) on the trunk. As the infection progresses, these fungal fruiting bodies may change in appearance, becoming more prominent as the tree’s structural integrity is compromised.

### Urgency and Action The urgency for Hypoxylon canker is rated as high, as the decline is often fatal if left untreated. If you notice bark shedding and a white fungal layer on your oaks:

1. Document the symptoms: Take photos of the affected areas.
2. Reduce stress: Focus on proper mulching and watering to support the tree.
3. Consult a professional: If the cankers enlarge over a few weeks, contact a certified arborist immediately to determine if the tree can be saved or if removal is necessary for safety.