Abai, MR

6th International Congress of DipterologyLooks yellow but green the chromatic cues for attractingthe orientation fruit fly, Bactrocera dorsalisWu, W.Y. & E.C. Yang & Y.P. ChenNeurobiology Laboratory, Department of Entomology, National Chung Hsing University,250 Kuo Kuang Rd., Taichung 40227, TaiwanThe oriental fruit fly, Bactrocera dorsalis, is one of the destructivetephritid fruit flies in Pacific Rim. Numerous methods had been developedto monitor and control this pest, and the so-called ‘yellow colored traps’were generally considered as effective devices to lure it. Since color is verysubjective and using color name would not give accurate information aboutthe visual cues, the attractive cues should be identified in terms of visualphysiology. To reveal which wavelengths are most attractive to the fly, wefirstly measured the spectral sensitivity of the fly’s photoreceptorsintracellularly. There were five types of photoreceptors were recorded: fourwith single peak wavelengths at 370, 380, 490, and 510 nm, and one withdual peaks at 350 and 490 nm. Based on the peak wavelengths, six coloredpapers with special reflectance spectrum were chosen to test the colorpreference of the fly. Our results showed that two wavelength ranges, 300~ 380 nm and 500 ~ 570 nm, were attractive to the fly. However,wavelengths between the two ranges, i.e. 380 ~ 500 nm, diminished theattractiveness.Key Words: oriental fruit fly, Bactrocera dorsalis, spectral sensitivity,color preference∗∗∗∗∗∗∗∗∗∗310