The invention provides aqueous pesticidal concentrates comprising at leastone colloidal solid, a dispersed emulsion phase comprising at least one substantiallywater-insoluble pesticidally active ingredient, which is either itself anoily liquid comprising the oil phase, is a solid but is dissolved in an oily liquidpresent in the oil phase, is a solid and is dispersed within the oil phase or is presentas a colloidal solid adsorbed to the liquid-liquid interface between the continuousaqueous phase and the dispersed oil phase and at least one Ostwald ripening inhibitor.
