You could make your bookshelves a home to neamatodes, which kill termites. However, that is not very practice. Instead take wood chips and cover them with boric acid. Place the wood chips behind the books (where they won't be seen). Get the boric acid sold at the hardware store, not the type that goes in pools. I know the bottle looks scary; however, people have been using boric acid as a natural pesticide for a long time with very few side effects. The boric acid will get on the termites as they climb on the wood chips. They will inject it off of their legs, and it will expand inside their bodies, killing them. It takes a few hours for he entire process to happen, so you are not likely to see dead termites where you placed the wood chips covered in boric acid.
I agree. Boric acid is an effective deterrent to several insects, including termites. It is important to conceal the boric acid to prevent a young child or someone from touching and accidentally ingesting it. Another suggestion is to check for a moisture problem near the books. Termites are attracted to wet wood, and correcting this problem will also prevent mold from forming on your books. Check out this hub regarding homemade termite treatments: http://naimamanal.hubpages.com/hub/Term … memade-Way