In which situation would trenching be used for termiticide application?

Trenching is a method of termiticide application primarily used around the foundation of structures to create a chemical barrier against termite intrusion. This technique involves digging a narrow trench in the soil adjacent to the foundation and applying the termiticide directly into the trench. By doing so, it ensures that the chemical penetrates the soil effectively, protecting the structure from subterranean termites that may attempt to enter from the ground.

Creating a protective barrier around the foundation is crucial, as termites typically travel through the soil to reach wooden structures. Proper placement of the termiticide in this manner provides a proactive defense, ultimately reducing the risk of infestations.

In contrast, other scenarios such as dealing with above-ground infestations do not necessitate trenching, as the termites are not using the soil as a route of entry. Similarly, when soil density is too high, other application methods may be more suitable than trenching, which can be challenging. Lastly, applying termiticide to protect wooden fence posts typically involves treatments that do not require trenching, as these posts are often treated directly or by using other methods designed for localized protection.