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Light and air is what is always recommended by Monty, who doesn't use chemicals and whose roses look amazing.
I had a David Austen rose climbing up a frame in a big pot and it's had a bit of black spot for the first time this year. Removed the clematis that I had sharing the pot and it seems to have stopped the black spot in its tracks, presumably due to improved airflow and more light
lemonade
@RodSaetan
Yeah, I wouldn’t use chemicals but I am removing the leaves as and when I have 5 minutes. Seems to be affecting all the roses of that type in that area too after a closer look.