Rust is a very common problem with roses. Remove as much as the infected material as you can. Do not compost this material. Spray with either Yates Fungus gun which is a ready to use option, Copper Oxychloride or Natures Way Fungus spray. Spray again in the winter months of the year.
To prevent rust next season. Prune your roses in winter to encourage good airflow. Take away all plant material. When watering water at the base of the plant and not on the foliage. Spray copper in winter. Feed your plant with rose fertiliser at the start of spring and again in summer.
All the best with your roses.
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