Melange, plant protection products containing this mixture and use

Mixture consisting essentially a) one or more esters of dicarboxylic acids of formula I ROOC-A-COOR (I) wherein the symbols R are each independently another, a C1-C20 and a represents an alkylidene group C1-C20 alkenylene or C2-C20 alkynylene, cycloalkylene or cycloalkenylene, or C5-C6 phenylene, and b ) the product II of reacting a triglyceride based on carboxylic acids, C2-C30 and the ethylene oxide and / or propylene oxide in the presence of a base. This mixture is used for the preparation of pesticides; the invention also comprises these pesticides herbicides, their use in the fight against undesirable plant growth as well as spray liquors which contain this.