GF-120® fruit fly bait (Dow AgroScience (Indianapolis, IN)) was evaluated on its ability to prevent melon fly (Bactrocera cucurbitae) females of various ages from ovipositing in cucumber patches with border with non-host sudax plants arranged in stripes. Cohorts of marked, protein-fed females, eclosed after 1, 2 or 4 weeks, were released from sites outside sudax borders (30, 90 and 135 cm) treated and untreated with GF-120®. The treated borders were more effective than untreated borders at suppressing incoming melon flies and dense (135 cm) treated borders were more effective than thin (30 cm) treated borders. Melon flies 2 and 4 weeks old (from eclosion) were captured at higher rates on the cucumbers than one week old flies. Female flies captured from treatment plots oviposited more eggs in cucumber squares and had highest mortality rates than those from non-treated, control plots.