Is this rose rosette disease?
Our red knockout roses look like they’ve been poisoned— but perhaps it’s something just as sinister - rose rosette disease? If so, I know I have to pull them up and burn them. The pale yellow rose among them is the only one that looks healthy. Any chance the disease affects one color more than another? Or is that bush by chance just more resistant?
We don't see all the symptoms for rose rosette, but we do see cankers on the stems. We'd recommend that you cut the infected rose (first photo) down to the ground and let it send out new clean shoots. (Dispose of cuttings off-site. You don't want infected mites spreading the disease.) Then you'll be able to see what you've got. You can send us new photos if you want.
The 2nd and 3rd photos show a dead rose. Remove it.
Yes, roses have vastly different susceptibility to diseases, though so far all seem to be susceptible to rose rosette.
Thank you so much!
We have 10 knockouts that all have some dead, some green on them. Will cut them all way back and cross our fingers. Would hate to lose them all —