Black spot doesn't go away
I'm really new to gardening and have encountered an issue with black spot on some roses that I recently "inherited".
I read that I should prune away any diseased parts of the bush, which I did, but now the black spot has returned (on almost every single bush!).
I'm not sure what to do! I sterilized my pruning shears, but not in between bushes, only at the beginning. Am I supposed to sterlize between each plant?
Please help me! I would hate for these to die, but I'm afraid to cut them anymore.
Thanks for any help!