In Mississippi, larvae of the carpenterworm, Prionoxystus robiniae (Peck), began feeding in the cambium and then tunneled obliquely upward into the sapwood for about 4 months, when they turned vertically upward. They lengthened and widened their galleries for about 24 months. The obliquely upward portion of galleries averaged 3 in. and the vertical portion 4.3 in. The gallery diameters averaged 0.6 in. Each gallery entrance, where the larva returned to feed, had a destroyed area of inner bark and cambium averaging 1.5 in.[2][1]. [1]: #fn-1