The attraction of female oriental fruit flies, Bactrocera dorsalis (Hendel), to protein and host fruit odors was examined in field-cage and field experiments. In field-cage experiments, we examined how the physiological state of laboratory-cultured female oriental fruit flies affected their responses to protein (Nu-Lure) and fruit (orange) odors. Both mated and unmated, protein-fed females (10–12 d old) were more attracted to fruit odors than to protein odors, whereas mated, protein-deprived females (10–12 d old) and unmated, protein-fed females (2–3 d old) were equally attracted to fruit and protein odors. The combination of fruit and protein odors was less attractive to protein-fed females than fruit odors alone. Field tests were conducted to compare capture rates of wild oriental fruit flies in traps baited with commercially available protein baits, Nu-Lure, Trécé A.M. Supercharger, and BioLure, and in traps baited with either fruit (orange) or Nu-Lure in a commercial guava orchard. Spheres baited with either Supercharger or BioLure captured more female oriental fruit flies than unbaited spheres when the lures were hung above spheres. Traps baited with Nu-Lure were more effective for capturing females than traps baited with orange puree in field tests.
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