Rose disease - white fluff spots on canes
Hello! I have some highly overgrown climbing roses in Klamath Falls, Oregon. Some have white spots on the canes. (Leaves aren’t out yet.) The white is fluffy and can be scraped off and it is dark brown underneath. What is this and what should I do about it? Also, how do I know which canes are from the rootstock and which are the bred roses? Thanks so much! Gardening is saving my mental health right now and I’m always so very appreciative of the service you all provide.
Klamath County Oregon