Thanks Joe! My Rosa davidii has been declining the last couple of years and actually I'm afraid I might lose it. I'm not sure why, but my latest thought was that maybe it has RRD but just doesn't express it the way other roses do? A Rosa glauca died from RRD right about the time I noticed davidii starting to decline and that glauca had been planted right beside my Rosa davidii - close enough that they were probably touching. I sure hope that this isn't some kind of atypical RRD response and that it bounces back soon.
But anyway, I got it many years ago from Forest Farm nursery and even moved it to our new place back in 2005, and in all those years it never had any damage from our zone 6b Maryland winters. So, I don't know if it would be hardy up your way, but I think there's at least a pretty good chance. Crossing my fingers for you!
Here's a link that has a picture of it from 2012 [the year I did that cross with fedtschenkoana pollen] before it shrunk down to just a few sticks.http://maprc.blogspot.com/2012/05/rosa-davidii.html