What is a preventive barrier in relation to termite control?

A preventive barrier in termite control is designed to stop termites from accessing a structure, thus minimizing the risk of infestation. The correct choice indicates that a chemical treatment is applied to inhibit termite entry. This typically involves the application of pesticides or termiticides to create a chemical barrier in the soil, around foundations, or within construction materials. These treatments work to either repel termites or kill them upon contact, effectively preventing them from penetrating the space and causing damage.

The goal of using a chemical treatment is to establish a long-lasting protective zone that termites cannot pass through, thus safeguarding buildings from potential infestations. This method is advantageous because it can cover larger areas and provide comprehensive protection when done properly.

A physical structure serves a different function by creating an actual barrier that termites cannot bore through, while a bait system focuses on attracting termites to a poison rather than preventing them from entering. Monitoring systems are essential for early detection but do not directly prevent termite entry.