The user wants pesticides that are convenient, safe and effective. The most commonly used types of formulation—dusts, aqueous solutions, dispersible powders and emulsifiable concentrates—all have their limitations. More sophisticated formulations have been developed which offer reduced handling hazards and provide better control of placement and persistence. These include granules, colloidal dispersions and encapsulated formulations with a wide range of particle size.
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Marrs et al. (1973) studied this question.