Technical Abstract: The efficacy of GF-120 Fruit Fly Bait was evaluated as a control of female oriental fruit fly, Bactrocera dorsalis (Hendel) in papaya orchards in Hawaii. Two important components of this study were field sanitation and mass trapping using the male-specific lure methyl eugenol. Three different spray regimes were evaluated: every row (high use of GF-120), every 5th row (moderate), and every 10th row (low). Orchard plots in which no GF-120 was applied were used as controls. A 10% mixture of GF-120 was applied to the foliage of papaya trees once a week for 14 wk and a 40% mixture was applied to border areas. Level of field sanitation was assessed both weekly (qualitatively) and every 6 wk (quantitatively). Trap capture and papaya infestation data served as indicators of the relative effectiveness of the GF-120 applications. For five of the seven bi-weekly periods that followed the first spray of GF-120, trapping data revealed significantly fewer female B. dorsalis captured in plots subject to high and moderate use of GF-120 than in control plots. Differences in incidence of infestation among treatments were detected only by the third (12 wk after first spray) tree-fruit sampling, with significantly fewer quarter ripe and half ripe fruit infested in plots subject to high and moderate use of GF-120 compared to control plots. Parasitism rates by Fopius arisanus (Braconidae) were not affected by GF-120 application.