Strategically timed augmentative releases of adult Compsilura concinnata (Meigen) and Brachymeria intermedia (Nees) were made agamst larval and pupal populations, respectively, of the gypsy moth, Lymantria dispar (L.),. in 1976. These eastern Pennsylvania studies were conducted in attempts to inoculate established parasite populations within nondefoliating host infestations and thereby reduce the temporal lag in parasite abundance. Year-of-release inundative effects also were anticipated based on a proposed B. intermedia augmentation model. Evaluations of release effects in 1976 and 1977 included weekly collections of 3rd–6th stage host larvae in C. concinnata study areas and weekly collections and field-monitering of host pupae in B. intermedia study areas. A statistically Significant, but managerially impractical, increase in C. concinnata parasitism was noted in treatment areas only dunng the year of release. Release of B. intermedia had no detectable effect on the host population sampled.