抄録
The development and life cycle of three related species of sawflies, Athalia rosae ruficornis, A. infumata and A. japonica sympatrically distributed widely across Japan and all infesting turnip and related plants were investigated. Larvae of A. rosae ruficornis showed the highest rate of development (K=114.94° at to=10.55°C) and was the most hear resistant of the three species. Some pupae showed slight developmental retardation at intermediate photoperiods. A infumata was the most cold-hardy species and showed least tendency to diapause under the investigated conditions. It is estimated that A. infumata larval development required 136.9°d at to=9.77°C. A. japonica entered diapause at the prepupal stage in response to photoperiod. Both long and short photoperiods induced diapause but continuous development occurred in a narrow range of photoperiods between 13L-11D and 14L-10D. A. japonica was the slowest developer of the three species. The supposed life cycles based on these data are consistent with the field observations of HIGASHIMOTO (1983) who observed six annual generations of both A. rosae ruficornis and A. infumata and two generations of A. japonica in the Kobe area.
