Photoperiodic Responses Controlling the Induction of Adult Diapause and the Determination of Seasonal Form in the Bean Bug, Riptortus clavatus

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Two photoperiodic responses manifested by adults were compared at 25℃ in the bean bug, Riptortus clavatus (Thunberg) (Heteroptera, Alydidae). There was on specific instar or stage sensitive to photoperiod that determined both the induction of diapause and seasonal forms. Long-day conditions and constant darkness prevented diapause, whereas short-day conditions induced it. No sex difference was observed in the photoperiodic response curve for the induction of diapause. In males, the curve for the determination of seasonal form was similar to that for the induction of diapause. In females, some long-day adults emerged with body coloration similar to that observed under short-day conditions, but the response curve resembled that in males and that for the induction of diapause in both sexes. Under conditions near critical daylengths, there was a close relationship between diapause and seasonal form, although this relationship was not perfect. These results may indicate a common time-measurement system for the two phenomena.
1993-12-15