Which abbreviation indicates a formulation type that consists of solid forms that dissolve slowly to provide a longer duration of action?

The abbreviation "P" or "PS" signifies that the formulation is a pellet or granular type designed to dissolve slowly. This slow dissolution is significant because it allows for the active ingredient to be released over an extended period, leading to a longer duration of action. This can be particularly beneficial in pest management situations where prolonged effectiveness is desired, as it minimizes the need for frequent reapplication.

In contrast to other formulation types, such as emulsifiable concentrates (E, EC, EW) or ready-to-use products (RTU), which may provide more immediate effects but can require more frequent application, solid formulations like those represented by "P" or "PS" are specifically formulated for sustained performance.