Most dust formulations are ready-to-use and contain a low percentage of active ingredient (usually 10% or less by weight). A few dust formulations, however, are concentrates and contain a much higher percentage of active ingredient
Micro-encapsulated pesticides are dry particles or liquid droplets surrounded by a coating. Coatings may be plastic, starch, or some other material. Micro-encapsulated pesticides are mixed with water and applied as a spray
Some active ingredients are insoluble solids: substances that will not dissolve in either water or oil. These may be formulated as flowables. (Most manufacturers use the letter “F” by the trade name to designate that the formulation is a flowable.
Granular formulations are similar to dust formulations; however, granular particles are larger and heavier. Like dusts, they are not water-soluble. They are ready-to-use–not intended to be mixed with water and applied as a liquid suspension.
Invert emulsions contain a water-soluble pesticide dispersed in an oil carrier. These products require a special kind of emulsifier that allows the pesticide to be mixed with a large volume of petroleum-based carrier, usually fuel oil
Wettable powders are dry, finely ground solid materials. Most include wetting and/or dispersing agents. Usually, they must be mixed with water and applied as a spray. A few products, however, may be applied dry or as a liquid suspension.
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