Bactrocera minax (Enderlein) (Diptera: Tephritidae) is a major pest of citrus fruit in the region from Nepal through to southwestern China. In tests on wild adult populations of B. minax in a mandarin, Citrus reticulata Blanco, orchard in western Bhutan, both males and females were more attracted to 50-mm-diameter spheres than to 50-mm discs of the same color. Furthermore, they were more attracted to spheres colored with orange or green–yellow mixtures than to similar spheres colored red, yellow, green, blue, black, or white. The UV reflectance from the orange (600–650 nm) and yellow–green mixtures (530 nm) was similar to that proposed byProkopy (1977) as eliciting strong attractant responses in other species of Tephritidae.