The influences of introduction of Cl, NO
2, COOH and SCN radicals to 4-thiocyanocarbanilide on the germination inhibitory activity of conidio spore of Cochlibolus miyabeanus, Alternaria kikuchiana and bacteriostatic action against Staphylococcus aureus, Escherichia Coli and Bacterium oryzae were investigated. 4'-NO
2 introducing compounds have the germination inhibitory activity and bacteriostatic action to the gram-negative bacteria, while 4'-SCN introducing compounds decrease the above effects. 4'-Cl introducing compound especially has a strong activity to Staphylococcus aureus. Further, 3, 5, 3', 4'and 5'-substituted compounds have 1-500 times stronger activity without exception than those substituting in 2, 6, 2', 6'-position. Both 3, 5, 4'-trichloro-4-thiocyanocarbanilide and 3, 4'-dichloro-4-thiocyanocarbanilide especially exhibit growth inhibitory activity towards Staphylococcus aureus in more than 30 million times dilution.
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