ABSTRACT
A total of ten parasitoid species were found on dairy farms in Maryland and New York over the three-year period. In New York, a lower percentage of the sentinel pupae were parasitized by M. raptor than in Maryland. A majority of the parasitism by the three predominant species occurred in August, September, and October; however, U. rufipes appeared to have a higher percentage of its seasonal abundance in July than did M. raptor and S. cameroni. Laboratory trials showed that 23% of the parasitized pupae produced female parasitoids; therefore, the average number of female M. raptor released weekly was 1,050 for the lower release farms and 3,150 for the higher release farms. A higher proportion of the seasonal abundance of M. raptor occurred in June and July on the release farms than on the non-release farms. An exception to this trend was noted for the higher release farms in June.
