I'm very sadly thinking of replacing the Margaret Merril rose in my garden as I am constantly losing the battle of blackspot with it, despite almost constant mollycoddling. At one point I took all the infected leaves off as recommend and it was almost naked! It's such a shame, as its such a beautiful (and beautifully scented) rose but I just don't find it that healthy. I've got a few others, including a Generous Gardener, a Olivia Rose Austin, and a Desdemona, and they all seem to be holding up pretty well. Could anyone suggest a healthy replacement? TIA