This thing is a black spot nightmare here in Florida zone 9b. It’s always defoliated at this point. I’m about to try the suggestion of NCbeach and try revitalize. I’ve been spraying with the usual copper fungicide and a few others in rotation, but it’s not helped much. The blooms smell heavenly and are beautiful, but don’t last long at all. At this point, it’s likely on the chopping block unless the revitalize works.