チャノキイロアザミウマ成虫の飛翔による分散時期と移動距離

抄録

In 2001 and 2002, dispersal by the flight of adult yellow tea thrips, Scirtothrips dorsalis Hood was studied using yellow sticky traps placed in tea groves and in an adjacent lawn, i.e., an open space. At the peak of the population density for each generation of S. dorsalis adults inhabiting the tea groves, the number of adults captured in each trap reached its peak. The number of S. dorsalis adults captured using the traps decreased with the increase in distance from the tea groves for each generation. These results suggest that S. dorsalis adults actively make shorts flights when their population density increases at their reproduction sites. The sex ratio (number of females/total number of males and females) of the adults captured by the traps was significantly biased toward females as compared to those inhabiting the tea groves.