Abstract
We investigated the seasonal occurrence of the rice stink bug, Niphe elongata (Hemiptera: Pentatomidae), in paddy fields and the ovarian development of females collected from fields in Shiga Prefecture, Japan. Early in August, when the rice ears of medium-maturing varieties emerged, adult bugs migrated to the paddy field, and the females laid eggs. The eggs hatched, and nymphs grew into adults. When late-maturing rice varieties started heading in late August, the adults entered the paddy field, and the females laid eggs. The eggs hatched, and the nymphs became adults. Therefore, in Shiga Prefecture, the life cycle of the rice stink bug produces two generations in 1 year. In September, no females had mature eggs in their ovaries, and adult bugs were believed to overwinter.
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