If it’s only a small amount, just pick off the infected leaves plus any fallen on the ground around the rose and dispose of them in the bin (not compost heap) to halt it’s spread. Give the rose a good, deep drink and mulch with some fresh compost around the base to suppress any spores. I have a new rose with a touch of rust and that’s all I have done. You really shouldn’t need any fungicide unless it’s spreading madly, if so there is a product called Rose Clear you could spray with - but it should sort itself out without that.
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