Greenhouse Evaluation of Clubroot Resistant- cv. Mendel and Its Efficacy Concerning Virulence and Soil Inoculum Levels of .

Clubroot resistance of oilseed rape (OSR) cultivars frequently relies on a major resistance gene originating from cv. Mendel. The efficacy of this resistance was studied in greenhouse experiments using two isolates, which were either virulent (P1(+)) or avirulent (P1) on Mendel.