12.2.8 Formulation Insecticides are formulated in a carrier material that serves to keep the active ingredient (the ingredient that kills the pest) stable and sometimes aids in the distribution of the active ingredient in the pests’ environment. There are a number of different ways to formulate insecticides and acaricides. The most appropriate formulation is determined by the method of application and the chemical characteristics of the insecticide. Typical formulations are:Wettable powders (WP) and water dispersible powders (WDP)WPs consist of an inert powder impregnated with the active ingredient and usually incorporating a wetting agent to aid ispersion in water. WPs can be used on all surfaces but are particularly useful on absorbent surfaces where the insecticide particles remain on the surface, making it available to insects walking over it.
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