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Visual orientation of Lycorma delicatula (Hemiptera: Fulgoridae) in light and UV conditions

Many insects prefer lights with certain spectral properties, and such preferences may be associated with behavioral contexts such as mating, host-finding or dispersal. Lycorma delicatula (Hemiptera: Fulgoridae) is a newly invasive species in Korea and is spreading rapidly. They are diurnal and may rely on visual cues for orientation. We conducted a series of three experiments to determine possible cues of visual orientation in L. delicatula: light/dark choice, UV/white light choice, and spectral preference experiments. Nymphs of the third and final stages as well as adults were used for these three experiments. In the light/dark choice experiment where insects had a choice of white light and darkness in a T-maze, L. delicatula oriented toward the white light, regardless of stage and sex. In a choice of UV and white light, L. delicatula preferred the UV light with 395 to 410 nm in wavelengths, throughout all stages and sex. In the spectral preference experiment where insects had a choice of four monochromatic colors in a circular arena, L. delicatula stayed significantly longer in the blue light than in white, yellow and green lights. Overall, nymphs and adults of L. delicatula oriented toward lights with shorter wavelengths. It is necessary to investigate the behavioral contexts under which L. delicatula prefer the UV and blue lights.