I had blackspot and a number of pests on my roses last year, and unfortunately, didn't take care of them as I should have since I had a baby and found myself with little time. I sprayed when I noticed the blackspot with some sort of fungicide after trying some more natural remedy I read of online, pulled off all the leaves at end of the season, raked, etc. I noticed that my leaves already have some of it still there this year. I just sprayed again, and hope to stay on top of it more this season, but is there anything else I should be doing?
Also, I seem to always have cane borers and last year got so many I had to cut back several canes way down to the ground. Now some of my roses look pathetic with only 1 or 2 main canes. My question is, did I need to cut the canes back that much? I did the pruning at the end of the season, late fall. Should I be spraying something on the roses in the winter, some kind of "dormant spray" to protect against pests and diseases? And will the canes grow back?? I read about rubbing the bud union with a knife, but I fear this will damage the rose. I don't know if I should replace the roses, or wait and see if they revive themselves.