What effect do insecticides like borates have on wood pests?

Insecticides such as borates are effective in controlling wood pests primarily because they can be absorbed by the wood, which allows them to target specific insect behaviors. When wood borers come into contact with borate-treated wood or ingest it while feeding, the insecticide disrupts their physiological processes. This action ultimately leads to their death. Borates are particularly known for their effectiveness against wood-destroying organisms because they persist in the wood for an extended period, providing lasting protection against future infestations.

Other outcomes like repelling insects or preventing nesting do not fully capture the action of borates on wood pests, as the primary mechanism is their lethal effect on insects that consume or contact them. While borates can also deter some pests, their main role is as a toxic agent once ingested. The statement regarding wood becoming completely unsellable is misleading because, while improper treatment or excessive damage can lead to reduced value, borate treatments are generally utilized to protect and preserve wood, making it more viable for sale when treated correctly.