Cedar-Apple Rust on Apple Trees: Identification and Management

A young apple tree developed orange spots on leaves after two weeks without rain. A follow-up photo confirmed the diagnosis.

Diagnosis

The orange spots with small raised spiny structures in their centers indicate cedar-apple rust, a fungal disease requiring both apple and cedar/juniper hosts. The disease affects leaves and fruit, causing premature defoliation and reduced fruit quality.

Management

Consult the University of Arkansas Extension publication FSA-7538 for detailed control strategies. Key approaches include resistant varieties, removing nearby cedar hosts (if feasible), and timely fungicide applications. Monitor for recurring infections annually.