McClure, M.S. 1991 Adelgid and scale insect guilds on hemlock and pine.. General Technical Report, (U.S.D.A., Forest Service) (NE-153): 256-270.

Notes: Abstract: Five piercing and sucking insects accidentally introduced from Asia and one native species reviewed including two armored scales, Fiorinia externa and Nuculaspis tsugae attacking Tsuga canadensis, and one margarodid, Matsucoccus resinosae attacking Pinus resinosa.