Leaf Spot on Weeping Redbud: Fungal Management

Brown Spots, Holes, and Crinkled Edges

Your weeping redbud in College Station, TX, shows classic fungal leaf spot (likely Cercospora or Phyllosticta), worsened by hot, humid conditions.

Cultural Controls

• Sanitation: Rake and destroy all fallen leaves in autumn—spores overwinter there.
• Watering: Avoid overhead irrigation; water at base early morning.
• Airflow: Prune nearby plants to improve circulation.

Fungicide Option (if severe)

• Apply chlorothalonil (Daconil) or mancozeb at first spot appearance.
• Repeat in 14–20 days.
• Next spring, spray at bud break with copper fungicide to suppress overwintering spores.

Key Point

Fungicides prevent new spots; they don’t cure existing ones. The unaffected sibling tree suggests microclimate or genetic resistance differences.