Redbud Leaf Yellowing: Powdery Mildew, Not "Leaf Mold"

"Leaf mold" isn't a standard diagnosis for redbud. The yellowing and heavy leaf drop you describe, especially after a wet season, points to powdery mildew (Microsphaera or Phyllactinia species) or possibly anthracnose.

Powdery Mildew on Redbud

• White powdery coating on leaves (may be subtle on redbud).
• Leaves yellow, curl, drop prematurely.
• Favored by shade, humidity, poor air flow.

Action Plan

1. Confirm ID: Check leaf undersides for faint white patches. Take sample to local extension.
2. Fungicide: Myclobutanil, propiconazole, or sulfur at first sign next spring. Repeat per label.
3. Cultural: Prune for air flow, avoid overhead water, rake/destroy fallen leaves.
4. Water deeply weekly (not just 1 ft deep—soak the root zone).

Don't Panic

Redbuds often defoliate heavily from mildew but refush and survive. The nurseries were right—it's rarely fatal. Focus on prevention next spring.