Abstract
The relationship between the frequency of root hair infection and clubroot severity caused by Plasmodiophora brassicae was studied using the European Clubroot Differential (ECD) hosts and 54 cultivars of 5 species of cruciferous plants which have been commonly cultivated in Japan. Root hair infection occurred in all test plants, but its frequency differed significantly among varieties and among cultivars even within the same species. Severe clubed roots occurred irrespective of the frequency of root hair infection. Although root hair infection is essential to induce club formation, the frequency of root hair infection was not closely related with the disease index representing subsequent disease severity.
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