Also see: http://www.sdshores.com/announcements/rose-rosette-disease-found-in-south-down-roses "Our South Down rose is the first confirmed case in NH." Here is a link that might be useful: link for above

Did Blue Girl show other symptoms of RRD? Did the canes that started red turn green? Or did other symptoms arise on that bush? Transmission within a garden seldom has ever happend in that sort a period of time. The vector mite populations don't spike until September in zone 5 conditions (this from the juried scientific literature.) When the rose arrived at your home from Michigan Bulb, was it leafed out, or was it bare of leaves, and had it been dipped in wax? You may not have heard of RRD before this happened. Most people haven't. But you might want to consider that the disease has been to the north of you in Canada, to the south of you in Pennsylvania, in every county in Ohio to the west of you. And so far, I've seen it to the east of you in the BBG in Brooklyn...in the middle of the city. The vector mites are easily carried by winds and fall infections on hybrid teas show most often in new growth the following spring. This I know from my own garden experiences and it fits what others see, as well. There is no way to say where the vector mites came from that infected the rose in your garden that is near your new rose. (And there is no lab test to identify the disease; experienced plant pathologists depend on a collection of symptoms for identification.) There is NO reason to tear up an entire rose bed. As suggested above, remove the sick rose(s). That's what we do when other diseases strike and it works for RRD. Do look upwind of your home for Rosa multiflora. You may find it along stream beds or even growing up into trees. With the disease pressure on roses to the north west and south of your state, RRD is moving into New York, even though it doesn't get talked about. Good luck. Don't panic or make yourself ill about this. I can say this because I've been dealing with RRD in my garden for ten years. I continue to grow roses. I loose a couple of plants each year to RRD. There's RRD in wild roses three miles away. It's become a fact of life, but I can enjoy the ones that live and try to mourn the ones I loose....a lot like life, really. My E-book linked below has twelve chapters about rose rosette as well as a FAQ. It's based on a lot of visiting other gardens with RRD in them as well as a lot of research. The Bibliography at the back is up to date, science wise, if you can stand to read about the intentional spread of RRD to kill multiflora.

What I did was to cut off the diseased growth below the point on the cane that it appeared on. Any new growth from that cane has not shown any more symptoms with the exception of General Cavaignac. It was asymptomatic for a whole year but started showing it again. I cut it off and watered it with more aspirin, and it has been okay. I am suspecting a reinfection rather than a relapse because it is close to the infected Dr. Huey. I have used an aspirin spray. I have used one 325 mg pill per 3 gallons of water, the size of my tank sprayer. I do have to watch it carefully because I have seen foliage burn on some of the plants doing this. There is increased blackspot resistance from this treatment, but again foliage burn can be a risk. I have also been using the harpin material for good blackspot control, but it does not appear to have much influence, if any, over rosette. I think that early detection and treatment is a key help for this problem, like cancer. If it gets too far along, the plant will probably be lost. I am also wondering if an interferon-like material would be a good treatment option if it could be either sprayed or maybe watered into the ground. I hope these observations help this situation somehow.

I'm new to roses (planted my first rose garden in 2011) and, thus far, they're all healthy, but I do read a lot and want to be educated and ready to remove plants if it becomes necessary. I saw my first RRD rose at my local independent nursery a few days ago. A landscaper had brought in a branch and blooms. The horticulturist on staff at the nursery was kind enough to gather a few of us around and point out what to look for. In all honesty, it looked really different in person than what I had here-to-then seen online and read in descriptions of the virus. It was really helpful to see the "witch's broom"-like growth, the blooms that looked like it was grown at a leaking nuclear plant, and the weird thorniness that were like thorn-hair. This particular afflicted plant was off a Knockout variety but I know it can affect all roses, so I'm watching everything at my house, praying that I don't have to "euthanize" any. Pretty scary. Wish there was something we could do to avoid it. Makes you feel so helpless. . .