What chemical property is often used to treat wood against powderpost beetles?

Boric acid is effective in treating wood against powderpost beetles due to its insecticidal properties. It works by disrupting the digestive processes of insects when ingested, ultimately leading to dehydration and death. This chemical not only helps in controlling powderpost beetle infestations but also serves as a preventive measure for future infestations.

Boric acid is favored because it poses less risk to human health and the environment compared to more toxic insecticides. Its ability to penetrate wood also allows it to provide long-lasting protection. Other options such as acidity, alkalinity, and chlorine do not possess the same efficacy or practical application in addressing powderpost beetle infestations.