A homeowner noticed large white spots with greenish centers on oak trunks where bark was missing. The diagnosis: "smooth patch," a condition associated with a fungus that typically has minimal impact on tree health.
Smooth patch occurs when a fungus colonizes the outer bark, causing it to slough off and reveal lighter inner bark. The greenish tint is often algae or lichen. While unsightly, it rarely threatens the tree's vitality.
No treatment is usually needed. Maintain tree health with proper watering, mulching, and avoiding trunk damage. Monitor for any signs of decline, but in most cases, the tree will continue to thrive.
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Oak Wilt vs. Oak Root Rot: Diagnosis and Long-Term Management
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Oak Tree Fungus Management: Drainage and Cultural Controls
Raised Orange-Brown Spots with Sticky Residue: Scale Insects
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Southern Live Oak Leaf Spot: Fungal Disease Management
Horned Oak Galls: Identification and Management on Pin and Water Oaks
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