On the basis of the hypothesis that sulfonanilide moiety had a control effect on clubroot of crucifers caused by Plasmodiophora brassicae, newly synthesized benzenesulfonanilides with various substituents were evaluated for the control of this disease. In general, 2-chloro-4-trifluoromethylanilide and 2-chloro-4-nitroanilide derivatives showed a relatively high efficacy. Among them, flusulfamide (21, 4-dichloro-a, a, a-trifluoro-41-nitro-m-toluenesulfonanilide) was one of the most active derivatives. The fungicidal activity of flusulfamide and its related compounds is discussed in this paper.

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