Pesticidal compositions of improved effectiveness are provided, including a pesticide (an insecticide or a mixture of an insecticide and a herbicide) together with a copolymer adjuvant or additive selected from the group consisting of acid or salt copolymers containing individual quantities of maleic and itaconic moieties. The compositions of the invention provide multiple-fold increases in effectiveness, as compared with an equal amount of the pesticide in the absence of the copolymer.La solicitud describe una composición pesticida mejorada que comprende un insecticida seleccionado del grupo que consiste en piretroides, organofosfatos, y mezcla de los mismos y un polímero, donde el polímero comprende porciones de maleico y de itacónico.
