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Rose black spot, caused by Diplocarpon rosae, is one of the most devastating foliar diseases of cultivated roses (Rosa spp.). The globally distributed pathogen has the potential to cause large economic losses in the outdoor cultivation of roses. Fungicides are the primary method to manage the disease, but are often viewed unfavorably by home gardeners due to potential environmental and health impacts. As such, rose cultivars with genetic resistance to black spot are highly desired. The tetraploid climbing rose Brite EyesTM (‘RADbrite’) is known for its resistance to black spot. To better characterize the resistance present in Brite EyesTM, phenotyping was conducted on a 94 individual F1 population developed by crossing Brite EyesTM to the susceptible tetraploid rose ‘Morden Blush’. Brite EyesTM was resistant to all D. rosae races evaluated except for race 12. The progeny were either resistant or susceptible to all races (2, 3, 8, 9, 10, 11, and 13) evaluated
By Jason D. Zurn (USDA-ARS National Clonal Germplasm Repository, Corvallis, OR), David C. Zlesak (Department of Plant and Earth Science, University of Wisconsin River Falls, River Falls, WI), Matthew Holen and Stan C. Hokanson (both Dept. of Horticulture, University of Minnesota, St. Paul, MN), James M. Bradeen and Nahla V. Bassil (Department of Plant Pathology, University of Minnesota, St. Paul, MN).
Published in "Frontiers of Plant Science", November 26, 2018.
