dave weil wrote:

Ann generously allowed me to reproduce her posts tome regarding my
incidence of Witches Broom.

And Ann agrees with me that what you have is unmistakably Rose Rosette
Disease. I am sorry that I was right, for once.

Now for yet another thing you probably do not want to hear and most
certainly will not thank me for saying:

I would not screw around with this thing and risk losing my other
roses. I would blast the hell out of the entire garden with Cygon,
reapply according to instructions, and when it is dry I would get
the infected rose the hell out of there and burn it.

I am getting rid of my multiflora asap.