Cedar Apple Rust
A fungal disease caused by Gymnosporangium juniperi-virginianae that requires both apple and juniper/cedar trees to complete its life cycle.
Affected Plant
Apple
Severity
Low to Moderate
Symptoms
- Bright yellow-orange spots on the upper leaf surface
- Orange, gelatinous spore-producing structures on leaf undersides
- Distorted or spotted fruit
Causes
- Fungal spores alternating between apple and nearby juniper/cedar hosts
- Wet spring weather favoring spore release and infection
Prevention
- Remove nearby juniper/cedar hosts where feasible and practical
- Choose rust-resistant apple varieties
- Maintain distance between apple trees and juniper/cedar hosts
Management
- Apply protectant fungicides during the spring infection period where warranted
Related Apple Diseases
Think your plant might have Cedar Apple Rust?
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Diagnose Your PlantDisclaimer: This is an AI-generated result and not a replacement for expert agronomic or plant-pathology diagnosis. Confidence scores reflect the model's certainty, not biological ground truth. The model was trained and evaluated on leaf photos captured under controlled, lab-like conditions, so accuracy on real-world field photos (cluttered backgrounds, variable lighting, multiple or overlapping leaves) may be lower than the reported evaluation metrics.