Southern Live Oak Leaf Spot: Fungal Disease Management

An 8-year-old live oak in Williamsburg, VA shows smooth, non-raised spots on green and brown leaves, premature drop, and yellow-bellied sapsucker holes.

Diagnosis: Leaf Spot Fungus

Multiple fungal (and some bacterial) pathogens cause leaf spots on oak. Spots vary in size/color, may have concentric rings or dark margins, and can coalesce into blotches. Spores overwinter in fallen leaves/twigs and infect new growth during wet weather.

Management

• Sanitation: Rake and dispose of infected leaves; prune dead twigs.
• Cultural: Avoid overhead watering late in day; improve air circulation.
• Fungicides (rarely needed): Only for severe/repeated defoliation, stressed/declining trees, or high-value specimens. Apply at bud break before symptoms, repeat per label (10–14 days) through spring rains. Labeled products: Bordeaux mixture, Daconil, Dithane, Fore, etc.

Primarily aesthetic; rarely kills tree.

Spotty Leaves