things like black spot is a fungus and some roses are more susceptible than others. so yes it can spread. chose disease resistant varieties. pick up the fallen diseased leaves and don't compost them. you could spray against it next spring. I have ZD next to a climbing white one [name has done a runner] and that hasn't succumbed yet .

Thanks Seaburn, I really don't like the look of the ZD. I think I might just dump it and be on the safe side. The ZD didn't cost that much but my other roses are David Austin and were quite expensive.

the name has staggered back in 'Climbing iceberg'.