Report on Female Flight Activity of the Asian Gypsy Moth, Lymantria dispar (Lepidoptera: Lymantriidae) and Flight Suppression with a Yellow Light Source in Japan

摘要

The flight duration of the female Lymantria dispar in Japan was observed in a net cage (H 1.9 m, W 1.3 m, D 2.9 m) under seminatural conditions at 17:00-21:00 in May-July in 2007-2009. Flight distance was estimated from the duration data and flight speed data obtained from the former test (21.3m/min.). Virgin and mated females of 4 different localities were examined for the tests. As a result, the duration and distance at 3 localities (Chiba, Kobe, and Hachinohe, N=108) were estimated as about 10 min. and 200 m. In contrast, those of Tomakomai (N=29) were about 30 min. and 600 m. The mean durations were not significantly different between virgin and mated female in the same localities. Next, the attractiveness and suppressive effect of yellow fluorescent light (Y) on nocturnal flight compared with black light (B) were examined in the same cage at 19:00-21:00 in May-July in 2007-2009. Both sexes were attracted by B, whereas Y showed a little attraction. In addition, female flight was strongly suppressed under Y lighting, and the effect was maintained under Y+B lighting.