Abstract
Investigations were performed on the diel activity of puncture to the host plant and active behavior such as wandering or take-off of the adults of the rhombic-marked leafhopper, Hishimonus sellatus UHLER. In the 2nd emergence period, the adults were moderately active for a time at the sunrise and active for a time before and after the sunset, but not active in other times. Their activity was apparently influenced by environmental conditions such as light intensity and temperature. They were active under 1, 000lux of light intensity, and light intensity adequate for take-off was about 1-200lux. Their basic periodicity was considered to be bimodal crepuscular type. But in the 3rd emergence period, unimodal crepuscular type, suppressed by low temperature was observed at the sunset or in the daytime. The threshold temperature for take-off was considered to be about 17°C. The number of punctures on the host plant was 117 for male and 81 for female in 48 hours, and was proportional to their active behavior such as wandering or take-off.
