The present invention relates to aqueous concentrates and solid formulations of pesticide preparations comprising copolymers which may be obtained by copolymerization of a) glycerol, b) at least one dicarboxylic acid, and c) at least one monocarboxylic acid of the formula (I) R.sup.1--COOH (I) Where R.sup.1 is (C.sub.5-C.sub.29)-alkyl; (C.sub.7-C.sub.29)-alkenyl; phenyl or naphthyl. The copolymer of the present invention increases the biological activity of the pesticide or herbicide.