Last year I managed to nearly kill a climbimg rose in a pot because I did not realise that the drainage wasn't working properly. If the rose has wet feet it will not be happy. Hope this might help.

Best Wishes

try a larger pot and add broken clay pots in the bottom or stones, this will help with drainage

Hi thanks for your replies, the drainage of the roses should be fine, as I have repotted them, into larger pots and with broken clay pots in the bottom and holes drilled into two sides,at the bottom of the plastic pots, but this has still happened. Do you think I have not watered the roses enough in this hot weather??????

Have you given it some feed?

Could be a water problem - but also simply because it's in a pot - unless your rose is a small variety, or a modern miniature, roses like to put down a couple of very long roots for a few feet, and this means they're not great in pots after a couple of years or even a year.