O-Alkyl-S-[3-oxo-triazolo-(4,3- alpha )-pyridin(2)ylmethyl]-(thiono)thiol-phosphoric(phosphonic) acid esters and ester-amides of the formula X RO PARALLEL (I) ANGLE P-S-CH2 R' in which R is alkyl with 1 to 6 carbon atoms, R' is amino, or alkyl, alkoxy or alkylamino each with 1 to 6 carbon atoms, and X IS OXYGEN OR SULFUR, WHICH POSSESS INSECTICIDAL, ACARICIDAL AND FUNGICIDAL PROPERTIES.
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