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Rust diseases produce raised pustules that rupture to release powdery, orange to red-colored spores on the underside of affected leaves.
Description
Leaf rust is a disease that attacks garden plants in wet, humid conditions. It is common on roses, snapdragons, hollyhocks, crabapples, and daylilies. Rust diseases produce raised pustules that rupture to release powdery, orange to red-colored spores on the underside of affected leaves. Light yellow spots can be seen on the upper leaf surface directly opposite the rust pustule on the bottom side of the leaf.
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