The melon fly, Bactrocera cucurbitae (Coquillett), readily lays eggs and develops in ivy or scarlet-fruited gourd. Coccinia grandis (L.). This plant has become naturalized in Hawaii where it is considered a noxious weed. We sampled C. grandis over a two-year period from several locations in the Kona region of Hawaii. In 1993 and 1994, average numbers of 500 to more than 800 adult melon flies per kg of fruit were recovered indicating that C. grandis is an important contributor to this pest's population. Natural parasitism of melon flies by the introduced braconid wasp. Psyttalia fletcheri (Silvestri), averaged 5.5 % during the two-year study. Less than 1.0[degrees]/c of the fruit was infested by the oriental fruit fly, B. dorsalis Mendel). and the Mediterranean fruit fly, Ceratitis capitata (Weidemann). BR Nutrition. Diet. Parasites diseases and disorders. Parasites. Insect parasites. Hosts. Insect hosts. Land zones. USA. Oceanic islands. Pacific Ocean islands. Bactrocera cucurbitae (Tephritidae): Host; Psyttalia fletcheri (Braconidae): Parasite. Bactrocera cucurbitae: Food plants, Coccinia grandis, Abundance and prevalence of hymenopteran parasite, Hymenopteran parasites, Psyttalia fletcheri, Hawaii; Psyttalia fletcheri: Dipteran hosts, Bactrocera cucurbitae, Prevalence, Hawaii. ST Insecta, Diptera, Brachycera, Cyclorrhapha, Tephritidae; Insecta, Hymenoptera, Apocrita, Terebrantia, Ichneumonoidea, Braconidae. Arthropods; Hymenopterans; Insects; Invertebrates; True Flies. none