Abstract
Abstract Seven isolates of Marssonina rosae (imperfect stage of Diplocarpon rosae) exhibited differences in colony color on potato-dextrose agar and in conidial measurements. Four of the isolates selected for pathogenicity tests differed in virulence when inoculated to 76 selected rose cultivars. The Chickasaw variant was the least virulent and the Oktibbeha variant was the most virulent. Cultivars ‘Brandy’, ‘Choo Choo Centennial’, and ‘First Prize’, showed resistance to all variants. ‘Coral Destiny’, ‘Golden Masterpiece’, ‘Goldilocks’, ‘Jennifer Hart’, and ‘Spartan’ showed resistance to three variants. Forty-two cultivars showed susceptibility to all variants tested.
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