Field and lab tests were conducted to determine the development and infestation levels of the elongate hemlock scale, Fiorinia externa, populations on eastern hemlock at four sites in eastern Tennessee and Western North Carolina. We documented two complete overlapping generations of the elongate hemlock scale overwintering as late first instars and gravid and non-gravid females. Females produce 12-16 eggs that begin to hatch in March. The mean density varied from 2.5 – 6.0 specimens per needle on foliage at the test sites. Nine predators and one parasitoid were documented to be established within the scale-infested sites. Predators produced up to 10% damage to prey populations at the various sites, the most prominent of which were specimens of Chilocorus stigma, Rhyzobius lophanthae, Scymnillus horni and Scymnus loweii. The parasitism rate for the host by the parasitoid Encarsia citrina ranged from 17.5% to 45% at the test sites.