Hi, all! We recently moved to a new home, and I've inherited a few yellow knockout rosebushes. I've been keeping an eye on them, and besides a little slug damage, things seemed to be going well. (Well, as well as I can tell anyway, having never grown these myself before!)

We got our first blooms this week, and I noticed what seems (to me) to be an abnormal amount of thorns. I know this is a symptom of RRD. Is this thorniness and those red growths below a sign of RRD?