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Granular pesticides are grains or pellets containing pesticidal toxicants diluted to the desired concentration by mixing with other inert and functional ingredients. They are processed to give fairly close particle size distributions with the objective of facilitating application at optimum rates. Formulations and preparations of granular pesticides vary widely but the preparation method generally falls into one of four categories: (1) impregnating on presized sorptive carriers, (2) sticking on presized carriers, (3) formulating and postforming, as in extrusion and agglomeration, and (4) postforming on a core. In addition to toxicants, carriers, binders, deactivators, dispersants, wetting agents, surfactants, core materials, and solvents are employed. Historically the commercial success of a toxicant has depended on the forms that are available for toxicant delivery. The use of granular formulations followed on the heels of emulsion concentrates, wettable powders, and dusts to achieve certain application characteristics not available in the other forms—primarily, the ability to deliver the toxicant to a desired point. Granular pesticides can be designed to penetrate foliage, lodge in certain positions in plants, sink in water (and then disintegrate or release the toxicant, or both), and minimize drift and dusting. Granular pesticides were defined at one time as granules of a size coarser than 100 mesh—that is, 60/90, 30/60, or 8/16. Currently the designation has been extended to include microgranules of sizes such as 100/200 mesh.
granular carriers, granular pesticides, granulation processes, granular particle sizes, pesticides
Manager of Clay Research, Floridin Co., Division of Penn. Glass Sand Corp. ITT, Berkeley Springs, W. Va.