Disclosed is a liquid pesticidal emulsion composition comprising (a) an aqueous continuous phase； (b) at least one colloidal solid； and (c) a dispersed oil emulsion phase comprising (i) at least one substantially water-insoluble pesticidally active ingredient, which is either itself an oily liquid comprising the oil phase, is a solid but is dissolved in an oily liquid present in the oil phase, is a solid and is dispersed within the oil phase or is present as a colloidal solid adsorbed to the liquid-liquid interface between the continuous aqueous phase and the dispersed oil phase； and (ii) at least one Ostwald ripening inhibitor soluble or miscible in the oil phase or which itself serves as the oil phase, and wherein if the composition further comprises an emulsifier formed of a low molecular weight or polymeric surfactant, the composition comprises less than 0.5 weight % of the emulsifier. Also disclosed is a method of combating pests in crops and a method for treating building materials or hides comprising applying the above emulsion to the crops or building material.
