The invention relates to novel alkoxyalkyl spirocyclic tetramic and tetronic acids of the formula (I),in whichA, B, D, Q1, Q2, Q3, Q4, G, W, X, Y and Z are as defined above,to a plurality of processes and intermediates for their preparation and to their use as pesticides and/or herbicides and/or microbicides, and also to selective herbicidal compositions comprising, firstly, the alkoxyalkyl spirocyclic tetramic and tetronic acids and, secondly, at least one crop plant compatibility-improving compound.
