1 Institute of Vegetables and Flowers，Chinese Academy of Agricultural Sciences，Beijing 100081，China；2 College of
Agriculture and Forestry，Hebei North University，Zhangjiakou 075061，Hebei，China；3 China’s Agricultural Science
and Technology Press，Beijing 100081，China
Clubroot disease，caused by Plasmodinophora brassicae， is a destructive disease for cruciferous
vegetables．Recently，this disease occurred in China by large areas．It is of important significance for cruciferous
vegetables production to clarify the infection ways and controlling methods of clubroot disease．In this study，
the seedling substrates were artificially inoculated with clubroot pathogen．The results showed that the substrate
carrying clubroot pathogen could lead to the occurrence of clubroot disease．And the more pathogen population in
substrate，the more serious was clubroot disease．Moreover，in the presence of 3×103 dormant spores per mL in
the substrate，the control efficiency of 7 kinds substrate with disinfectants against Chinese cabbage and cauliflower
clubroot pathogens were determined．The results also indicated that 50% fluridamine suspension and 10%
cyperazole suspension had the best control effect on clubroot diseases．The control effect could reach 100.00%．
These 2 chemical agents were safe for Chinese cabbage and cauliflower seedlings and could be used as substrate
disinfectants to control clubroot disease．
