Seen as raised orange or brown spots or pustules on the underside of leaves and stems. Common on Roses, Hollyhocks, Fuchsias, Pelargoniums and many other plants.
Cultural measure: Avoid using too much nitrogen when feeding. Pick off and burn diseased leaves.
Product solution: Systhane Fungus Fighter, Fungus Fighter Disease Control, Multirose Concentrate 2, Multirose 2 Ready To Use.