Janet Baraclough wrote:
And as a postscript, some roses get blackspot, some don't.
IME, all roses get blackspot, just some worse than others!
Some are very resistant to it. I've never known rugosa roses get
blackspot.

Ah, I don't really count those as roses, they're more kind of hedges with
rose flowers in them. :-}
(In the same way that I count fuschias that are big and bushy and hedgelike
as totally different plants to the delicate little pot-raised standards or
tumblers that won't last a winter ...!)