: aspects of pathogenesis and resistance in

Clubroot is one of the most damaging diseases in crops world-wide. The pathogenicity of is highly variable between as well as within field populations. Several sources of resistance to clubroot have been identified in. Generally, resistance tends to inherit partly as a recessive, partly as an additive trait, and appears to be controlled by few major genes. Progress in the understanding of the inheritance of resistance is being made through the use of single-spore isolates of the pathogen, and the use of molecular markers for resistance genes.