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There are more than 5,000 known species of rust on plants. Common rust is a fungal disease that affects roses, snapdragons, bluegrass and woody perennials. Bacterial Diseases, Plant Diseases, Fruit Trees, Trees To Plant, Plant Leaves, Planet Natural, Plant Pests, Insect Spray, Garden Remedies
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Rust Fungus: Identify Symptoms to Treat and Control Rust Disease

Reddish-orange spore masses are found primarily on the surface of lower leaves.