The invention relates to novel compounds of the formula (I):in which W, X, Y, Z, A, B and G have the meanings given herein, to a plurality of processes and intermediates for their preparation, and to their use as pesticides and/or herbicides； relates to selective herbicidal compositions comprising, firstly, geminally alkoxy/alkylspirocyclically substituted tetramic acid derivatives and, secondly, a crop plant compatibility-improving compound； and relates to the boosting of the action of crop protection compositions comprising compounds of the formula (I) through the addition of ammonium salts or phosphonium salts and optionally penetrants.
