Field assessment of hybridization between Laricobius nigrinus and L. rubidus , predators of Adelgidae

•We examined population changes among two Laricobius species and their hybrids.•On hemlock, L. nigrinus populations increased and L. rubidus populations decreased.•Laricobius nigrinus was dominant on hemlock; L. rubidus was dominant on white pine.•Hybrids were dominant on hemlock and their populations remained steady over time.•Stable hybrid zones will most likely be maintained.