Cruciferae clubroot is one of important worldwide diseases, caused by Plasmodiophora brassicae Woron., a kind of obligate parasite. In recent years, the occurrence of clubroot gets more and more serious, and the control difficulty increases much. Application of resistant varieties is regarded as an effective way for clubroot disease control. Nevertheless, the problems for artificial inoculation methods indoor and standards of disease grading must be considered adequately. Based on the current situation that...