Microbicidal compositions including (a) cyanodithiocarbimate and (b) an N-alkyl heterocyclic compound； a triazole compound or salt thereof or metal complex thereof； a microbicide with an activated halogen atom or a formaldehyde releasing compound； 1,4-bis(bromoacetoxy)-2-butene； 2-(thiocyanomethylthio)benzothiazole； a methylene-bis(thiocyanate)； a halogenated acetophenone； a halopropynl compound； an iodosulfone； a phenol； a halocyanoacetamide compound and/or a quaternary ammonium compound are described. Components (a) and (b) can be present in a synergistically effective amount to control the growth of at least one microorganism. Methods for controlling the growth of microorganisms with the compositions are also disclosed.
