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Antifungal activity of five newly synthesized organothiophosphonates namely N-(2-Methoxy-2-oxoethyl)-2-pyridinylidenamido (diethyl amido) (phenyl) thiophosphonate, N-(2-Ethoxy-2-oxoethyl)-2-pyridinylidenamido (diethyl amido) (phenyl) thiophosphonate, N-(2-Methoxy-2-oxoethyl)-2-pyridinylidenamido (diphenyl amido) (phenyl) thiophosphonate, N-(2-Methoxy-2-oxoethyl)-2-pyridinylidenamido (diisopropyl amido) (phenyl) thiophosphonate and N-(2-Methoxy-2-oxoethyl)-2-pyridinylidenamido (N-methyl cyclohexylamido) (phenyl) thio phosphonate incorporating the pyridine ring were evaluated against four seed-borne pathogens of Capsicum annuum namely, Alternaria alternata, Aspergillus flavus, A. niger and Fusarium oxysporum and compared with mancozeb and bavistin. All these compounds incorporate bulky substituents as well as a central phosphorus atom, which is electrophilic due to electron …