Inorganics are known for providing what type of action against structural pests?

Inorganics are known for their long residual action against structural pests because they tend to remain effective on surfaces for extended periods. This characteristic is important in pest control, as it allows for ongoing protection and minimizes the need for frequent reapplication. Long residual action means that once applied, these substances continue to deter or kill pests over time, effectively breaking the pest lifecycle and reducing the overall pest population in treated areas.

This is contrasted with other types of action, such as knockdown or immediate effects, which refer to a rapid incapacitation or killing of pests upon contact but do not necessarily provide lasting protection. Immunity, although relevant in pest biology, does not pertain specifically to the action of inorganics in pest control practices. Thus, the focus on the longevity of effectiveness accurately captures the key attribute of inorganic substances used in pest management.