Effects of photoperiod on reproduction and longevity of Podisus nigrispinus (Dallas) (Heteroptera: Pentatomidae) were assessed under seven different photophases (10, 11, 12, 13, 14, 15, and 16 h) at a constant 28 ± 1°C temperature and 70 ± 10% RH in the laboratory. Photoperiod affected the longevity of P. nigrispinus females. The highest longevity (24.10 d) occurred with a 15-h photoperiod, compared with longevity of 9.75 d at 12-h photoperiod. The preoviposition period of P. nigrispinus was influenced by the photoperiod. The preoviposition period of P. nigrispinus was longer for the 16-h photoperiod (7.25d) than for the 12- (4.06d), 13- (4.00 d), and 14-h (3.68d) photoperiod. The postoviposition period, the number of egg clutches per female per day, and the interval between egg clutches were not affected by the photoperiod. The postoviposition period ranged from 1.46 d (at 14 h of light) to 3.71 d (at 11 h of light). The number of egg clutches per female per day varied between 0.19 (at 11 h or 14 h of light) and 0.40 (at 15 h of light). The interval between egg clutches ranged from 1.29 d (at 14 h of light) to 2.07 d (at 11 h of light). The variation in the number of eggs and egg clutches per female of P. nigrispinus in relation to their age varied according to the photophase to which they were exposed. The fecundity of P. nigrispinus females was higher in 15 h of light. These informations serve as a valuable ecological variable in modeling population dynamics of P. nigripinus, both in the field and in the laboratory, thereby contributing to the success of A. argillacea control programs.
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Vol. 103 • No. 4