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Identifying and Treating Palm Rust Fungus

Black Spotted Spores on Potted Palm Fronds

A thin, fan-like potted palm has black spore-like spots on leaves. Owner wants disease ID and cure.

Diagnosis

Nick says it's rust fungus—common when fronds stay wet. Copper fungicide (Home Depot) protects new fronds; old ones stay spotted but it's cosmetic, not fatal.

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