Cedar-Hawthorn Rust: Life Cycle and Management

Diagnosis

Orange, stringy growths on hawthorn berries and orange dust when sprayed with water confirm cedar-hawthorn rust. This fungus alternates between red cedar and hawthorn trees.

Breaking the Cycle

• Rake and destroy all fallen hawthorn leaves.
• Spray chlorothalonil (Daconil) on hawthorn three times in spring, starting at bud break.
• Consider replacing with 'Winter King' hawthorn, which is resistant.

Images

Further Reading

See "Hawthorn and Quince Rusts" and "Rust Differences".