Stump-breeder
Guides
Pseudohylesinus tsugae
Pseudohylesinus tsugae is a crenulate bark beetle in the family Curculionidae, native to western North America. It has a univoltine life cycle with two broods and four larval instars, overwintering as a fourth-instar larva. The species is closely associated with western hemlock (Tsuga heterophylla), where adult females feed on the inner bark of living trees before breeding in fresh stumps. It is distinguished from the sympatric P. grandis by its preference for stumps over slash as breeding substrate.