Having recently moved from Osoyoos, where magnificent roses seem to flourish, toally disease free, I am quite frustrated with my efforts here. Apart from carpet roses, which seem to have no problems, climbers, HT's etc. seem riddled with mildew and black-spot. Although very reluctant to use sprays, perhaps I will have to, in this case. Any suggestions for the best, disease-resistant varieties, and for ways to control the disease?