Evaluation of Radish Cultivars for Resistance to Clubroot (Plasmodiophora brassicae) Race 6 for Midwestern United States. Randall C. Rowe, Associate Professor, Department of Plant Pathology, Ohio Agricultural Research and Development Center, Wooster 44691, and Ohio State University, Columbus 43210. Plant Dis. 64:462-464. Copyright 1980 American Phytopathological Society. DOI: 10.1094/PD-64-462.

Sixty-eight radish cultivars and breeding lines were tested in the greenhouse for resistance to clubroot caused by Plasmodiophora brassicae, race 6. Although most of the American radishes tested were moderately to highly susceptible, all of the Japanese and many of the Dutch cultivars were completely resistant. Further field tests of 16 Dutch radishes indicated that the cultivars Novitas, Roem van Zwijndrecht, Flevo, Robijn, Saxafire, Scharo, and Verano were resistant and horticulturally suitable for commercial production in the midwestern United States.