Clubroot is a serious soilborne disease of cruciferous crops caused by Plasmodiophora brassicae Woronin worldwide and a difficult problem because its pathogen’s resting spores can live in soil for at least 10 years. To control club root of Chinese cabbage and reduce environment pollution by chemicals application, the mechanisms of disease control and yield increase were studied by biological soil disinfection with fresh Brassica oleracea var. caulorapa de Candolle, Artemisia apiacea and Eupatorium...