Sub-micron pesticide particles down to as low as 200nm (average) can be prepared by high-intensity bead-milling and used to make both liquid and granular formulations. The increased particle number and surface area can deliver improved activity and lower doses. The approach is flexible and practical, with the milling technology already used in other industries, and fits into the development of a wide range of formulations from high concentration one-active suspension concentrates (SCs) to water dispersible granule (WG) mixtures with just one of the pesticides present as sub-micron particles. The correct selection of surfactants can be important to aid milling and minimise crystal growth in stored sub-micron aqueous suspensions, but this is often possible.

Advanced formulation method for generating sub-micron pesticide particles

248th National Meeting (2014)

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