N- N',N'-disubstituted-aminomethylidene!-(thiono) thiolphosphoric acid ester imides of the formula ##EQU1## in which R is alkyl with 1 to 6 carbon atoms,PPR' is alkyl, alkenyl or alkynyl with up to 6 carbon atoms, lower alkylmercapto-lower alkyl or N- alkyl- carbamoylmethyl,PP R" and R'" each independently is alkyl or alkenyl with up to 6 carbon atoms, or conjointly with the nitrogen atom form a heterocyclic ring, and X is oxygen or sulfur, P PWHICH POSSESS INSECTICIDAL, ACARICIDAL AND NEMATOCIDAL PROPERTIES.
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