根肿病是重要的十字花科作物土传病害,病原菌为专性寄生的芸苔根肿菌Plasmodiophora brassica Woron.,属根肿菌目芸苔根肿菌属,主要侵染寄主植物根部形成根肿症状。根肿菌侵染包括根毛侵染和皮层中柱侵染2个阶段,在外界环境条件适宜的情况下,根肿菌休眠孢子萌发释放的初生游动孢子侵染寄主根毛并形成游动孢子囊产生次生游动孢子,次生游动孢子再侵染根毛或者是成对融合进而 Clubroot disease is an important soil-borne disease of cruciferous crops. The pathogen is an obligate parasitic Plasmodiophora brassica Woron., Belonging to the genus Euphorbiaceae and mainly infects the roots of the host plant Swollen symptoms. Root blight infection includes root hairs infection and cortical column infection in two stages, under the appropriate external environmental conditions, the root blister spores dormancy spores germination of the primary motile spores of infestation host hair and the formation of zoosporangia Secondary zoospores are produced, secondary zoospores re-infiltrating root hairs or in pairs