Seasonal Assessment of Supercooling Points for Two Introduced and One Native spp. (Coleoptera: Derodontidae), Predators of Adelgidae.

The hemlock woolly adelgid, Annand, is an invasive insect that threatens hemlock species in eastern North America. Several species from the genus are predators of in its native areas of Asia and the western United States. Two species have been released as biological control agents: Fender, and Montgomery and Shiyake.