Abstract
The effect of photoperiod on reproductive diapause was examined in females of two anthocorid bugs, Orius sauteri and O. minutus, collected in northern Japan (43.0°N). Photoperiodic responses of both species showed the long-day type. The critical photoperiod for diapause induction was estimated to be between 14L-10D and 14.5L-9.5D in O. sauteri, and between 14.5L-9.5D and 15L-9D in O. minutus. Unmated females of both species laid no eggs throughout their lifetime. When nymphs grew under the long daylength (=16L-8D) conditions, emerging adult females of both species laid eggs even when they were kept under short daylength (=11L-13D). These results suggest that adult females are not sensitive to the short daylength. When nymphs were allowed to grow under short daylength and the emerging adults were transferred to long daylength, the percent of diapause termination in females by the long daylength alone differed between the two species (24.1% of O. sauteri and 70.0% of O. minutus laid eggs).
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