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Abstract
Ten systemic and non-systemic fungicides were evaluated in vitro and under glasshouse and field conditions for control of potato black scurf disease, caused by Rhizoctonia solani Kuhn. The systemic fungicides benomyl, thiabendazole (TBZ), and carboxin were superior to all others in inhibiting mycelial growth of the test fungus in vitro. Also, when applied as seed-tuber dust treatments, the three systemics provided the best control of rhizoctonia stem canker under both glasshouse and field conditions. Dust formulations with 2.5% a.i. of benomyl, TBZ, and carboxin, applied at the rate of 1 kg/100 kg seed-tubers, gave control comparable to that of the 2-methoxyethyl mercuric chloride dip treatment.