O-CHLOROALKYL-S-(ALKYL, CYCLOALKYL, PHENYL AND CHLORO-, ALKYL-, NITRO- AND/OR ALKYLMERCAPTO-SUBSTITUTED PHENYL)(O- AND S-(ALKYL, CYCLOALKYL, PHENYL AND CHLORO-, ALKYL, NITRO- AND/OR ALKYLMERCAPTO-SUBSTITUTED PHENYL) AS WELL AS N-ALKYL AND N,N-DIALKYL)-THIOL AND -DITHIOL-PHOSPHORIC ACID ESTERS AND -THIOL-PHOSPHORIC ACID ESTER AMIDES, WHICH POSSESS FUNGICIDAL PROPERTIES AND WHICH MAY BE PRODUCED BY REACTING THE CORRESPONDING O-CHLOROALKYL-S-(ALKYL, CYCLOALKYL, PHENYL AND CHLORO-, ALKYL-, NITRO- AND/OR ALKYLMERCAPTO-SUBSTITUTED PHENYL)-THIOL-PHOSPHORIC ACID DIESTER CHLORIDE WITH THE APPROPRIATE ALCOHOL, MERCAPTAN, PHENOL, THIOPHENOL, N-ALKYL AMINE OR N,N-DIALKYLAMINE, IN THE PRESENCE OF AN ACID BINDING AGENT OR WITH THE SECOND COMPONENT IN THE FORM OF ITS SALT, E.G. ALKALI METAL OR AMMONIUM SALT.