Wow, that's some nasty looking stuff. Never get that here. On the rare occasions I *do* see blackspot, I usually spray it with GreenLight rose spray. But that's very rare, except for Austrian Copper. That one can develop blackspot in 0% humidity, I swear. I just let it go, it's off in a corner and it doesn't bother me to see it with blackspot because I don't see it!
