Pesticidal compositions of improved effectiveness are provided, including a pesticide (e.g., an insecticide or 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.提供了具有經增強效果的除害組成物，該組成物包括除害劑(譬如殺昆蟲劑或除草劑)連同選自於由含有個別數量的順丁烯二酸部分與伊康酸部分之酸或鹽類共聚物所構成之群組的共聚物佐劑或添加劑。本發明之組成物和不含共聚物之同等份量除害劑相比係提供多倍加乘之效果。
