Evaluation of Rose Cultivars for Resistance to Rose Rosette Disease
Byrne, D., N. Anderson, T. Evans, S. B. Collins, B. England, K. Solo, A. S. Windham, F. A. Hale, and M. T. Windham.  2017.  VII International Symposium on Rose Research and Cultivation, Session 7, Poster 10, Angers, France, July 2-7.

Rose rosette disease has devastated rose plantings in the eastern United States. In the last twenty years, numerous anecdotes of resistant rose cultivars have been reported. However, these reputedly resistant roses have not been evaluated for resistance to rose rosette disease in a replicated trial. One hundred and ninety one cultivars of roses were evaluated for resistance to rose rosette disease in Newark, Delaware and Crossville, Tennessee (2-5 replicates per location). Plants were exposed to natural inoculum via ballooning eriophyid mites and infested with mites collected from plants symptomatic for rose rosette disease. Ninetyseven cultivars have shown symptoms for rose rosette in at least one replicate at one or more test sites. Since infections of Rose Rosette Virus can remain latent for at least twelve months, plants of the eighty-four remaining asymptomatic cultivars will be monitored in 2017. At the end of this study, all asymptomatic cultivars will be tested for Rose Rosette Virus using PCR to insure the roses are not symptomless carriers of the virus. Cultivars with resistance for this disease will be used in breeding programs to incorporate resistance into roses with superior horticultural traits.