ABSTRACT OF THE DISCLOSURE: 0-(0-ethyl-5-alkylphosphoryl)-0-(carbamoyl)-pyrocatechol derivatives of the formula I(I)where R1 is C1-C4-alkyl, R2 is hydrogen, C1-C4-alkyl or C1-C4-alkoxy, R3is hydrogen or C1-C4-alkyl, and X is oxygen or sulfur, and methods ofcombating pests with effective amounts of I.
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