Answer: The following hybrids seem to be more resistant to black spot than most others:
'Brandy', 'Iceberg', Pristine', and 'Gold Medal'.
For resistance to powdery mildew try these:
'Gold Medal', 'Pristine', 'Honor', 'Voodoo'.
For resistance to rust:
'Gold Medal', 'Honor', 'Pristine' and 'Iceberg'.
Good luck with the roses!
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