The Common House Borer prefers old, well seasoned timber. The beetles emerge from the wood between November and February, they are more active at night, and return to flight holes during the day to lay eggs.
The Two-toothed Longhorn Borer is more destructive. it prefers softwood timbers. These beetles emerge during autumn, and are active over a long period. They dislike light and prefer the underside of timber.
The Powder Post Borer is similar to the Common House Borer, but only attacks the sapwood of hardwood timbers (Oak, Tawa, etc.). It lays its eggs in the pores of the hardwood, so softwoods are not affected.
This info is from my BCITO training manual. :slfg: