Abstract
To check the sensitivity to photoperiod inSemiadalia undecimnotata Schneider the beetles were transferred to laboratory short day (12 L: 12 D) and long day (18 L : 6 D) both during diapause (mid-November) and after diapause (in mid-May, when most females were still in their hibernation quarters and when the outdoor photoperiod was 16 hr 40 min.).
After diapause, most parameters of reproductive activity (fecundity, oviposition intensity, duration of pre- and post-oviposition periods) were identical at both photoperiods, indicating thus insensitivity to photoperiod. Only the incidence and duration of ovipositional arrests were higher under short-day conditions.
In the middle of diapause the sensitivity to photoperiod was still high, so that reproduction was inhibited under short day and 20°–24°C.
Résumé
Au cours de ce travail on a cherché à établir la sensibilité à la photopériode chezSemiadalia undecimnotata Schneider. Les insectes furent récoltés sur les lieux d'estivo-hibernation pendant (minovembre) et après la diapause (mi-mai) et placés au laboratoire sous une photopériode courte (12 J: 12 N) ou longue (18 J : 6 N).
Après la diapause, la plupart des caractères de l'activité reproductrice (fécondité, intensité de l'oviposition, durée des périodes des pré-et post-oviposition) sont identiques sous les 2 photopériodes et montrent une insensibilité des insectes à la photopériode. Seulement les arrêts de l'oviposition sont sensiblement plus fréquents et plus allongés sous la photopériode courte.
Au milieu de la diapause, la sensibilité à la photopériode est encore assez élevée et empêche la ponte sous une photopériode courte et à 20°–24°C.
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Hodek, I., Ruzicka, Z. Insensitivity to photoperiod after diapause inSemiadalia undecimnotata [Col. Coccinellidae] . Entomophaga 22, 169–174 (1977). https://doi.org/10.1007/BF02377839
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DOI: https://doi.org/10.1007/BF02377839