Chrysanthemum white rust is a fungal disease caused by Puccinia horiana. It leads to the development of yellow or green spots on the upper surface of the leaves, which can later become brown and necrotic. Pink or white pustules on the bottom side of leaves are also characteristic.
Plants infected by chrysanthemum white rust exhibit spots on the upper surfaces of leaves. These spots are initially pale-green to yellow in color and up to 5mm in diameter, but may turn brown as the tissue becomes necrotic. On the underside of the leaf, the spots develop into pink or white pustules that become prominent as the teliospores develop.
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