Ivy gourd, Coccinia grandis (L.) Voigt, patches throughout Kailua-Kona, Hawaii Island, HI were identified as persistent sources of melon fly, Bactrocera cucurbitae (Coquillett), with a low incidence of Psyttalia fletcheri (Silvestri), its major braconid wasp natural enemy in Hawaii. These habitats were used to evaluate augmentative releases of P. fletcheri against melon fly. In field cage studies of releases, numbers of melon flies emerging from ivy gourd fruits placed inside treatment cages were reduced up to 21 fold and numbers of parasitoids were increased 11 fold. In open field releases of P. fletcheri into ivy gourd patches, parasitization rates were increased 4.7 times in release plots compared to those in control plots. However there was no significant reduction in emergence of flies from fruits. In subsequent cage tests with sterile melon flies and P. fletcheri, combinations of sterile flies and P. fletcheri produced the greatest reduction (9 fold) in melon fly emergence from zucchini (Cucurbita pepo L.). Results suggest that combinations of parasitoid augmentation with sterile flies are a biologically sound approach to suppression of melon flies in Hawaii. These non-chemical approaches will be tested further in an area-wide pest management program in Hawaii that includes releases of P. fletcheri and sterile melon flies.