I have never had rosette disease. First, I would make sure that I had the disease from a local expert - either from cooperative extension or from a university.
Did you get all of these roses from the same supplier? At the same time? If so, call the supplier/store and DEMAND a refund. They should know that there may be a problem and not sell any more of these roses. I wouldn't buy anything from that supplier/source again unless they were able to explain the problem and convince me that they ahd solved it.
I saw some hostas that I thought might be virused at a big box store and alerted the manager. He didn't seem to care. No more plants for me from that store. I wrote a letter to the CEO about it as well. (That is my new hobby - complaining in writing to CEOs.) I was sent a gift certificate which I spent on non plant items, but the suspect hostas were still on sale. I could have been wrong about the virus. The complete disregard and ignorance of the manager was what concerned me. He should have either assured me that the hostas were from virus free stock (if so, they were mislabeled) or admitted that he didn't know about hosta virus, but would check with the experts at the main office - assuming there were experts at the main office.
I would dig up the infected plants and remove as much soil from that area as possible. Then, I would wash all of my tools, gloves, clothes, pots, etc. very well. If I had to drag the infected plants to the store and make a scene, I would. Otherwise, I would photograph them, look into having them tested and burn them. If the other ones came from the same source, I would at least put them in pots and keep them far away from my other roses. I would refrain from buying any more roses until the entire mess was cleared up one way or another.
If your Julia Child roses were from another source, I would put them in pots with purchased soil (or soil from somewhere other than your garden) using cleaned tools. I would keep them as far as possible from your diseased roses and the dirt where the diseased roses were growing.
I read that rosette disease could be spread from wild roses. Take a walk around your home and see if there are other apparently infected roses in the wild or in other people's gardens.
You could always grow some hot pink knockouts to clash with the neighbor's red ones.
