Effects of Stationary Photoperiod on Diapause Induction of Eysarcoris lewisi DISTANT(Heteroptera:Pentatomidae)and the Developmental Stage Sensitive to Stimulus for Reproductive Diapause

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The critical photoperiod for reproductive diapause in Eysarcoris lewisi DISTANT was between 15L-9D and 15.5L-8.5D. The 5th instar and the adult stages were sensitive to photoperiod, a stimulus for reproductive diapause. When the bugs were reared under 16L-8D during the nymphal period and then were switched to 12L-12D in the adult stage, no females laid eggs. The preoviposition period of females which experienced 12L-12D at least in the 5th instar was longer than that of the females which experienced 16L-8D. The 3rd instar was a stage sensitive to photoperiod which was a stimulus for nymphal growth; the nymphs reared under 12L-12D in the 3rd instar grew more quickly in the following 4th and/or the 5th instars than those under 16L-8D in the 3rd instar.

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