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From 2016 to 2018, approximately 15% of kohlrabi were observed displaying significant clubroot symptoms in farmer's fields in Jeju, Korea. The initial infection appeared as hypertrophy of root hairs, and as the disease progressed, galls formation occurred on the main roots, finally disease progress resulted in yellowing and wilting of leaves. Pathogenicity was proven by artificial inoculation of plants with resting spore suspension, fulfilling Koch's postulates. The resting spore is one-celled,doi:10.5423/rpd.2019.25.1.33 doaj:8bd58b3dc30a411fbd9c2255f37a21e6 fatcat:3zyasuvn6rafvoasfwdwhtgjli