Co-formulation comprising a plant growth regulator and an oil, and methods of preparing and using said co-formulation

An agricultural co-formulation comprising:

• i) an effective amount of at least one plant growth regulator, or at least one plant growth regulator and an additional biologically active ingredient;
• ii) at least 50% w/v of at least one oil;
• iii) 1 to 70 g/L of at least one oil-soluble surfactant dispersing agent comprising a random polyester condensate;
• iv) at least one emulsifying agent;
• and
• v) 1 to 20 g/L of a rheology modifier comprising fumed silica or a gelling clay, wherein the plant growth regulator, or the plant growth regulator and the additional biologically active ingredient are dispersed in the oil;
• wherein the final concentration of at least one plant growth regulator, or at least one plant growth regulator and an additional biologically active ingredient, is optionally adjusted by adding additional oil and one or more rheology modifiers and/or activation agents as required to substantially stabilize the co-formulation;
• and wherein the efficacy of the plant growth regulator is substantially maintained or improved;
• and
• wherein the co-formulation has been prepared by post-comminution of a millbase concentrate comprising the oil-soluble surfactant dispersing agent, the oil, and the plant growth regulator, or the plant growth regulator and the additional biologically active ingredient, and the comminuted form has an average particle size in the range of from 1 to 12 microns.