Noun
(phytopathology) A common disease of cabbages, radishes, turnips, and other plants of the Cruciferae, caused by Plasmodiophora brassicae, in which galls form on latent roots, rendering them clublike.
Synonym: finger-and-toe
A root thus affected.
Source: en.wiktionary.orgClubroot can live in soil for 20 years. Source: Internet