Abstract: Flight behavior of the oriental armyworm Mythimna separata(Walker) moth in airflow was studied systematically using wind tunnel and scanning entomological radar. The results showed that the moths responded obviously to wind in the cylindrical wind tunnel, and they took off and flew against airflow in flight. When the wind speed was 3.0～5.5 m/s, up to 92%～94% moths tested could fly through the 2meter wind tunnel; while, only 71.9% tested moths flew helically through the cylindrical wind tunnel against airflow when the wind speed reached to or over 6.0 m/s. In the annular wind tunnel, their maximum flight speed was 7.2 m/s; more than 90% of the tested moths flew with certain angle against airflow when the wind speed was or over 4.0 m/s. Radar observations indicated that the stratification occurred in the course of the Oriental armyworm migration. The moths headed southwest in autumn migration. The flight displacement of the moths was related to wind direction and speed.

Key words: Mythimna separata, flight behavior, wind tunnel, radar, airflow