Crabapple Cedar-Apple Rust: Fall Cleanup and Spring Spraying

Diagnosis

Yellow/rust leaves on newly planted crabapple = Cedar-Apple Rust. Fungus requires juniper/cedar alternate host nearby.

Current Management

• Rake and destroy fallen leaves daily (removes inoculum).
• Fertilize this fall to strengthen tree.
• Water deeply during dry spells.

Spring Protocol (Critical)

1. Start fungicide spray at bud break.
2. Repeat every 7–10 days through spring.
3. Use rust-labeled fungicide (e.g., myclobutanil, propiconazole).