A herbicidal composition comprising an aqueous suspension of microcapsules, having a capsule wall of a porous condensate polymer, and containing a solution of fluoroxypyr in a rosin solvent system comprising rosin and/or a rosin derivative. There is also provided a herbicidal composition comprising microcapsules, having a capsule wall of a porous condensate polymer, and containing fluoroxypyr and a solvent comprising rosin and/or a rosin derivative. A method of preparing a herbicidal composition is also disclosed, comprising providing a water immiscible phase comprising fluoroxypyr and an isocyanate dissolved in a rosin solvent system comprising rosin and/or a rosin derivative； providing an aqueous phase comprising one or more surfactants； combining the water immiscible phase and the aqueous phase to form a dispersion of the water immiscible phase in the aqueous phase； adding to the resulting dispersion an amine, thereby forming microcapsules of polyurea containing droplets of the water immiscible phase； and curing the microcapsules.
