Woodworm is the common term used to refer to the larvae of all wood boring beetles. There are several species has been found, but most of the damage is caused by the offspring of the Common Furniture beetle. 

Don't forget to re-paint and re-varnish treated surfaces when they are dry. Death Watch beetle infestations occur deep within a timber, so it is essential to treat by injection as well as a surface treatment. This can be done by injecting woodworm treatment spray into the exit holes left by the adult beetles.