[Contributions to the flight behaviour of the pine shoot moth : II. The influence of wind and light on the flying direction in a wind tunnel by male moths].

1. Males ofRhyacionia buoliana turn to the light source in immovable air. They favoured the more intense light source (100 W=950 Lx; measured at the starting point) above lower intensities. 2. The males flew-rarely walked-in the wind tunnel independent from the intensity of the air stream (max. 1.5 m/sec) upwind in direction to the light source (15 W=58 Lx). 3. Was the air stream directed to the light source (15 W), then the moths started upwind and drifted passive to the light source. The behaviour was independent from the intensity of the airflow. 4. Light sources of the same illumination (15 W) offered on both sides of the tunnel stimulated the moths to stard upwind but immediately after starting they drifted downwind. 5. Light sources of different intensities (40 W resp. 100 W=305 Lx resp. 950 Lx) given at the same time, changed with increasing windspeed the approached flight of the moths from the luminous side to that with the poorer light source. 6. These results are discussed in respect to the departure of male moths in areas free of pines.