Figure 1.  Soil moisture/infection level in Chinese cabbage by Plasmodiophora brassicae (Adapted from: Dobson, R., R.L. Gabrielson and A.S. Baker.  1982.   Soil water matric potential requirements for root-hair and cortical infection of Chinese cabbage by Plasmodiophora brassicae.  Phytopathology 72:1598-1600.)