What is a characteristic of borates used for termite control?

Borates are a popular choice in termite control due to their chemical properties. Being highly soluble in water allows them to be easily applied as a treatment, facilitating penetration into porous materials like wood. When dissolved, borates can effectively reach sites where termites are present or where they may establish colonies. The water solubility ensures that the treatment remains effective even when applied in various forms such as sprays or solutions.

In contrast, the other options suggest characteristics that do not align with the useful properties of borates. For instance, being non-soluble would hinder their ability to be distributed effectively in the environment, while restrictions to dry conditions or outdoor use only would limit their application in managing infestations that could occur in various settings, including indoors. The versatility provided by their solubility and effectiveness in various conditions is what makes borates a preferred method in pest control.