American Pillar climbing rose
I have a large old American Pillar climbing rose that was very severely cut back 3 years ago, it gets very badly infected by mildew, which discolors the flowers and they then fall of. I have been spraying it with a fungicide which controls the disease but this operation has to be done every 2 weeks during the summer. Is the American pillar prone to disease? I would like to have a climbing rose on the cottage wall, if I planted a disease resistant climbing rose would I be wasting my time?
The wall is south facing, exposed, heavy clay.