Which termiticide is not typically used for soil treatment?

Borate is a termiticide that is commonly used for wood treatment rather than soil treatment. Its primary application is to protect wood against termites and other wood-destroying organisms through direct application to the wood itself. This is because borate acts as a wood preservative, penetrating the wood fibers and providing a long-lasting barrier against termites when they feed on treated wood.

On the other hand, the other termiticides listed, such as permethrin, fipronil, and chlorfenapyr, are synthesized for soil treatment applications. They can be applied to the soil to create a chemical barrier that prevents termites from entering the structure. This distinction highlights borate’s unique role in termite management, focusing on protecting wood rather than treating soil or providing a perimeter barrier against termite intrusion.