Importance

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Abstract

Tetrahydro(thio)pyran-2,4-dione derivatives of the formula ##STR1## where R.sup.1 is hydrogen, a cation, alkylcarbonyl, C.sub.2 -C.sub.10 -alkenylcarbonyl, or benzoyl which is unsubstituted or substituted by alkyl, R.sup.2 is alkyl, R.sup.3 is a non-aromatic, unsubstituted or alkyl-substituted heterocyclic compound of 5 to 7 ring members and having at most one double bond in the heterocyclic ring, X is oxygen or sulfur, and Z is oxygen or the radical NO--R.sup.4, R.sup.4 denoting alkyl, alkenyl, alkynyl, haloalkyl, hal oalkenyl, alkoxyalkyl or the radical CH.sub.2 --R.sup.5, where R.sup.5 is a he terocyclic compound of 5 ring members and containing from 1 to 3 hetero-atoms and from 0 to 2 double bonds and bearing either no substituents or one or two substituents selected from the group consisting of alkyl, alkoxy, halogen, trifluoromethyl, alkoxymethyl, alkylthiomethyl and vinyl, or R.sup.5 is phenyl which is unsubstituted or bears from one to three substituents selected from the group consisting of alkyl, alkoxy, halogen, trifluoromethyl, nitro and dialkylamino, and their use for combating unwanted plant growth and for regulating plant growth.

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First Claim