Some rose species hybrids

Well the Rosa palustris X fedtschenkoana  F1 has pretty much defoliated from blackspot, I guess. It'll still be fun to see it bloom next year (hopefully) but it doesn't look like a winner for disease resistance by any means.

 In contrast, these new Rosa davidii X fedtschenkoana are looking incredibly healthy. One is showing mildew (and might get culled because of that) but the rest are looking great. I don't see much if any signs of disease.