Abstract
The predatory bugPodisus maculiventris Say displays a reproductive diapause. In the laboratory, at 23±1°C, when the pre-imaginal stages were reared on larvae ofGalleria melonella L. (Lepidoptera: Pyralidae) under a short photoperiod of 8L: 16D, diapause was induced in all adult females, whereas under a long photoperiod of 16L: 8D none entered diapause. Nymphal development was faster under the diapause-inducing short photoperiod than under the diapause-averting long photo-period. By contrast, embryonic development was faster under the long than under the short photoperiod. Diapause maintenance was also under the control of photoperiod. After a 10-d-period of chilling at 4°C, diapause was quickly terminated in adults kept under long photoperiod whereas it was maintained in most of those kept under short photoperiod. The predation rate of non-diapause or post-diapause adult females was much higher than that of diapause females.
Résumé
La punaise prédatricePodisus maculiventris présente une diapause obligatoire. Au laboratoire, à 23±1°C, lorsque les stades pré-imaginaux sont élevés sur des larves deGalleria melonella (Lep. : Pyralidae) sous une photopériode courte de 8 : 16 (L : D), la diapause est induite chez toutes les femelles adultes alors qu’aucune entrée en diapause n’est observée avec une photopériode longue de 16 : 8 (L : D). La vitesse de développement larvaire était plus rapide sous une photopériode courte induisant la diapause que sous une photopériode longue empêchant celle-ci. Au contraire, le développement embryonnaire était plus rapide avec une photopériode longue qu’avec une photopériode courte. Le maintien de la diapause était aussi contrôlée par la photopériode. Après une période de froid de 10 jours à 4 °C, la diapause était rapidement terminée chez les adultes maintenus en photopériode longue alors qu’elle était maintenue chez la plupart des adultes gardés en photopériode courte. La prédation des femelles adultes non diapausantes ou sorties de diapause était beaucoup plus élevée que celui des femelles en diapause.
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Chloridis, A.S., Koveos, D.S. & Stamopoulos, D.C. Effect of photoperiod on the induction and maintenance of diapause and on development of the predatory bugPodisus maculiventris (Hem.: Pentatomidae). BioControl 42, 427–434 (1997). https://doi.org/10.1007/BF02769836
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DOI: https://doi.org/10.1007/BF02769836