If you spot the infestation of woodworm in the early stages before any structural damage has occurred, it is fairly easy and cheap to treat with a good Boron-based preservative.
Woodworm holes found in timber are caused by the larvae of beetles that feed on the timber. Larger holes on the surface of the timber are formed when the adult beetle emerges from the timber to mate.
The most common type of woodworm is the Common Furniture Beetle.
In most cases treatment of Common Furniture Beetle commonly known as woodworm is fairly straightforward. Any structurally-weakened timber should be removed and replaced with pre-treated timber and the rest treated with a Boron-based preservatives.
How to treat woodworm?
This is the Woodworm killer I use and recommend, I use it to get rid of the common furniture beetle described above and other wood boring insects in building timbers. Also, for the prevention of fungal decay in sound timbers after the removal of all sources of moisture. I/e leaking pipes and roofs.
Wykabor 10 eradicates all types of woodworm so identifying the exact species is not necessary.
It works out a lot more cost effective than branded products available from Diy stores.
Best of all it does what it says on the label.