What aspect of pest control involves treatment around piers?

The aspect of pest control that involves treatment around piers is primarily known as backfill application. This process typically occurs during the construction phase of a building, where soil and other materials are filled in around the piers to provide support. Treatment in this context aims to prevent pests, particularly termites, from accessing the wooden structures above ground by creating a protective barrier.

Implementing a backfill application is crucial as it ensures that the treated soil is in direct contact with potential pest entry points, reducing the likelihood of infestations. This method can involve using chemical barriers or physical barriers, depending on the specific plan for pest management.

On the other hand, surface treatment generally involves applying pesticides to exposed areas of the ground or foundation, while subterranean treatment specifically targets pest activity below ground level, such as in soil or voids. Emulsion spraying typically refers to a method of applying a liquid pesticide to surfaces rather than to soil around structural supports like piers. Each of these approaches serves different purposes and contexts in pest control.