Clubroot of many crops caused by Plasmodiophora brassicae is an economically important disease on cruciferous vegetables and rape. Presently the use of resistant varieties is the most cost-effective control measure. Since the pathogen consists of various pathotypes and takes on a sophisticated genetic makeup, effective selection of resistant sources will be of great significance to the disease-resistant breeding. Based on the investigation of clubroot occurrence in affected areas, then inoculated with patho...