Functional and numerical response of Laricobius spp. predators (Coleoptera: Derodontidae) on hemlock woolly adelgid, Adelges tsugae (Hemiptera: Adelgidae)

► Laricobius osakensis and Laricobius nigrinus are two specialized predators of Adelges tsugae. ► Functional and numerical response of adults and larvae of both species was assessed. ► Adults functional response was similar for both species. ► Numerical response was higher for L. osakensis across densities. ► L. osakensis larvae had a higher functional response than L. nigrinus.