"Can I dig them up now in late July?"

Yes. I just dug up a mini and put it in a pot b/c it has had a rough year. No problem, it already looks happier in a pot.

"Can I prune them back now? How severely?"

Someone else can answer this. I would be more likely to defoliate the spotty leaves but leave the branches. They should have active growth nodes and be able to send out new leaves easily.

"Can I make them into "bare root" roses somehow to plant next year, or should I replant them immediately in the new spot?"

There's no way to bareroot them that I know of. You could pot them up, or replant.

Cheers,
Michelle

Thanks so much, everyone, for all the helpful replies.

So I did it; I dug up three of the six. I defoliated and even pruned a little. I transplanted them in some raised beds. I know they will live; roses are hard to kill, ironically, for being a sometimes tricky plant.

I'm already glad I did it; the area where I removed them from is the first thing people see when they approach the house. The nearly nude spindly branches and black spot and sorry looking blooms were not attractive. :)

What's funny is that last year, their first year in that spot, they did great. I thought I'd found the "ideal" place for roses. :S

--Katy

Katy, it isn't that the spot was not "ideal" so much as your plants need to be treated for blackspot with a fungicide on a regular basis. Moving them won't eliminate the blackspot issue. Blackspot is always present, and the key is to begin and continue treatment before the fungus has the opportunity to germinate.

If you already have blackspot the only fungicide that will kill the spores is Manzate or a product with zinc and manganese in it. The other fungicides only prevent it from starting.