There are several known Borer types in New Zealand with only three generally found in structures. The Two toothed long horn is the most infamous- it is a close relative to the Huhu grub, it is large in size and will seriously damage a site structure in one life cycle- their presence is obvious and infected wood should be cut out and burned- the surrounding unaffected timber should be professionally preserved. This species is relatively rare inside the home but the Common house Borer is not. Much smaller in size their damage is less aggressive but their life cycle is much shorter and they multiply faster- damage is often more intrusive than observed.
Modern day timber treatment effectively prevent infestation, however this was not always the case, in the fifties it was becoming common the heat treat timber at the mill. This is said to be effective at killing Borer, however this does not protect even marginally against post milling introduction. This is where most Borer’ is suspected to originate in the home.
Post milling treatment- many homes in New Zealand need to be treated at some stage for Borer infestation, in order to preserve structure strength and mitigate further damage. There are four common treatment methods utilized for structural Borer.