Black spot is usually caused by high humity and over head watering. It is best to start cutting your roses back by 1/2 around valentines day in my zone 8. Hybrids are beautiful roses, I just have a few and mostly antique roses at my place. I would clean out all the decayed leaves and would have cut it back by 1/2 and start using a feeding and spraying regeimend about evey 2 weeks till you see results. Don't give up the peace Rose is one my favorites. Take a look at the Antique Rose Emporium site, you may already have seen it. I have been bying from them for many years, allways have good roses, went there for the first time this past weekend, the rose's in full bloom and I thought I had died and gone to heaven!
www.weAREroses.com
rosemary