There're in a 30-year old upright piano. I can see the areas they've attacked. It's in a house in Vermont that's unheated during the winter. The exterior is black and varnished, but the interior–keys, soundboard, etc.–is pine and spruce and in its natural state. There's been some fine sawdust on the floor coming from one section they've gotten in to on the underside of the bottom (not painted), and the bottom (which comes out) has more from where they've been at the soundboard. That's also the case when you turn the piano around and look at the back. That's entirely frame and soundboard, unpainted. Also when you lift out the keyboard–which you need to do from time to time for maintenance–you see sawdust from the underside of the keys.
Filed under how to treat by