597515 Disclosed herein is an aqueous, pesticide-comprising dispersion of a polyurethane which is a reaction product of at least one polyol (A), which are compounds having at least 2 hydroxyl groups, selected from low-molecular weight diols or polyols and polymeric polyols selected from polyester polyols, polycarbonate diols polyacrylate polyols and polyether diols and their mixture, and at least one polyisocyanate (B), which are compounds of the formula X(NCO)2, where X is an aliphatic hydrocarbon radical having 4 to 12 carbon atoms, a cycloaliphatic or aromatic hydrocarbon radical having 6 to 15 carbon atoms, or an araliphatic hydrocarbon radical having 7 to 15 carbon atoms, to plants or plant parts, wherein the polyisocyanate comprises at least 10% by weight of aromatic diisocyanate and at least 10% by weight of aliphatic diisocyanate, in each case based on the polyisocyanate, wherein the dispersion comprises less than 5% by weight of nonionic surface-active substances. Additionally disclosed is a method of treating pests, esca, insect attack, mite attack or fungi in woody plants comprising the step of applying said aqueous, pesticide-comprising dispersion.
