Studies of loblolly pine during 1972–74 demonstrated that there was significantly less height increment, numbers of available tips, and total tip growth resulting from continual attack from Nantucket pine tip moth. Annual percent damage (total dieback/total growth per tree) was 19.6, 25.8, and 17.7%, respectively, for each of the 3 yr. Percent infested tips overestimated percent damage and does not vary in the same manner as percent infested tips.