another

last one

Having (thankfully!) never seen RRD in person, I would say they look mighty suspicious. I have seen many Knock Outs and this doesn't look usual for them to me. Kim

Yes.

Take a look at the buds - KO sepals are rather small and simple. Those sepals are much more serrated on their edges and many have 'leaf' like ends. In your last photo, the sepals are horrifically overgrown.

KO buds are seldom the least bit thorny on their stems; these fine dense thorns aren't on any non-RRV KOs that I've examined. Many sick KOs have the hyperthorniness on some of their stems below their recepticles.

I would expect your sick blooms to hold on to their petals; healthy KOs drop their petals cleanly.