The present invention relates to methods of reducing the viscosity of an aqueous agrochemical concentrate comprising a) an adjuvant selected from an alkoxylated aliphatic acid, an alkoxylated aliphatic alcohol, an alkoxylated aliphatic amide and an alkoxylated aliphatic amine, wherein the concentration of adjuvant in the aqueous agrochemical concentrate is at least 50 g/l; the method comprising including b) a compound selected from: i. an aryl sulphonate; ii. an aliphatic mono alcohol; iii. an aliphatic polyol comprising at least four contiguous carbon atoms; and iv. anaryl alcohol; in the aqueous agrochemical concentrate; wherein the aqueous agrochemical concentrate comprises an agrochemical active ingredient. The invention also relates to the agrochemical con centrates and methods of using the agrochemical concentrates for controlling or preventing infestation of plants by phytopathogenic microorganisms.