The Mediterranean fruit fly, the Melon fly, the oriental fruit fly, and the Solanaceous fruit fly are persistent pests of fruits and vegetables in Hawaii. Voracious feeding by the larvae causes fruit to decay, thus rendering the produce unfit for human consumption. Recently, an IPM program was undertaken jointly by the USDA-ARS and state agencies in Hawaii to demonstrate the potential of utilizing a package of control tactics, including biological control, for suppression of fruit flies. The IPM program has provided an opportunity to assess and quantify the potential impact of parasitoid augmentation when utilized alone as a strategy for suppression of fruit flies. In 2003 and 2004 open field releases of the larval parasitoid Psyttalia fletcheri were made in Laie. Kuhuku served as a control site. The two sites are not identical, but have comparable field sizes, stands of fruit-bearing papayas, and matching wild vegetation of Coccinia grandi infested by melon fly, Bactrocera cucurbitae. C. grandis serves as a major source of melon flies that infest cultivated crops. The relative abundance of melon fly in the experimental sites is monitored with a) male lure traps and b) emergence of flies and parasitoids from infested C. grandis and papaya. The fly trap data (expressed in catch per trap per day, CPTD) are supplemented with parasitoid emergence and host pupal mortality data generated from melon fly and B. dorsalis puparia recovered from ivy gourd and papaya fruit collections. An update on the progress of our research results in papaya is presented.