The impotance of the color stimuli in foraging and host-finding by phytophagous insects are determined by various experiments. Since the lantern fly Lycorma delicatula (Hemiptera: Fulgoroidea) was first reported in Korea in 2006, damages on grapevine are growing annually. It is often observed that nymphs and adults of L. delicatula shift host plants several times during the course of the season. However, information about the dispersal behavior of L. delicatula is scarce. We conducted a series of three experiments to determine possible cues of visual orientation in L. delicatula. In the Light/Dark choice experiment, nymphs had a choice of light and no light conditions in the T-maze. In the color preference experiment, we measured the time spent in one of four colored lights: Yellow, blue, green, and white. In the UV experiment, more than 98% of 3rd and 4th nymphs had a choice of UV (395 - 410 nm) and white light conditions in the T-maze. As a result, 91% individuals in the 1st nymph stage before the first foraging oriented toward the light conditions. And after 7 days, 93% in 1st nymph choose the light arm. But only 63% in 2nd nymph chose the light and light preference was decreased by days. It represents that light response of L. delicatula could change among instars. In the color preference experiment, more than 60% of L. delicatula in 3rd and 4th nymph chose blue light. In the UV experiment, more than 90% of 3rd and 4th nymphs preferred the UV light to the white light. This result is suggested that nymphs are sensitive to light and oriented toward shorter wave light such as blue and green.

Since its first discovery in Jinchoen in 1998, three types of Bemisia tabaci have been recorded in the Repulic of Korea. Because B. tabaci damages the high-return produce such as eggplant and bell pepper, non-chemical methods are sought to control the B. tabaci populations. We studied the mating behaviors of Q-type B. tabaci by video-recording 20 virgin pairs using digital microscopes, of which 10 had a successful mating. The mating behaviors of Q-type males can be divided into searching, paralleling to female, mounting and wing-flicking stages, whereas those of females were almost motionless throughout the mating sequence. During the paralleling stage, males also exhibited antennal drumming and undulation behavior. B. tabaci is know to use vibratory signals during mating. To understand the frequency and function of vibratory signals, we are simultaneously video-recording mating behaviors and measuring vibratory signals by means of a laser vibrometer.