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Identifying rose canker.. (Think I killed them. HELP!)

So I lost two roses and am pretty sure I lost them to black spot (RIP Dolly Parton and Voo Doo). A week and a half ago, I did some pruning but did not clean my pruners in between shrubs. (Idiot mistake, I know)

Peaking around my garden now and I see how some green canes are starting to turn brown. What does this mean? Do my roses have canker? Did I just do an armature job of pruning and what's why they are turning brown or did I spread whatever killed to the others? Where and how should I prune them?

For some reason this site isn't letting me post multiple photos, so will post them separately.

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