A standard set of host differentials and unified nomenclature for an international collection of Diplocarpon rosae races

authored by: V. M. Whitaker, T. Debener, A. V. Roberts, S. C. Hokanson
Abstract: Black spot of rose is distributed throughout the world and is the most serious disease of roses (Rosa spp.) in the outdoor landscape. Resistance breeding has been frustrated by the occurrence of races of the causal pathogen Diplocarpon rosae. Races from Germany, North America and the UK have been characterized and maintained in a pathogenic state. However, these races were characterized using independent sets of host genotypes and are referenced using different nomenclatures. In the present study, a total of 15 D. rosae isolates from these locations, as well as Belgium and Italy, were inoculated to a common set of 15 rose cultivars in replicated, detached leaf trials. Baby Love™ (cv. Scrivluv) was resistant to all isolates except for one originating from the UK. The rose cultivars Mrs Doreen Pike (Ausdor) and Hansa were resistant to all isolates except for one originating from Minnesota, USA. No rose genotype was universally susceptible. A total of 11 pathogenic races were differentiated based on their unique host ranges and were assigned an international race nomenclature. Nine cultivars are proposed as the first standard set of differential genotypes for characterization of D. rosae races.
Organisation(s): Section Molecular Plant Breeding
External Organisation(s): University of Florida
University of East London
University of Minnesota
Type: Article
Journal: Plant pathology
Volume: 59
Pages: 745-752
No. of pages: 8
ISSN: 0032-0862
Publication date: 08.2010
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Agronomy and Crop Science, Genetics, Plant Science, Horticulture
Electronic version(s): https://doi.org/10.1111/j.1365-3059.2010.02281.x (Access: Open)