Orange Rust on Mulberry and Other Landscape Plants

Diagnosis

The orange powdery coating on mulberry, dogwood, maple, willow, and others is likely rust fungi. Mulberry rust is common but rarely threatens tree health; it may cause early leaf drop.

Management

• Fungicide sprays (chlorothalonil, captan) every 10–14 days in spring can suppress it, but coverage on large trees is impractical.
• Rake and destroy fallen leaves to reduce overwintering spores.
• In most cases, no treatment is needed; the disease is weather-dependent and may not recur.

Do not panic—rust is primarily cosmetic.