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Hatching pattern and survival of first instars of Ectropis excursaria (Guenee) (Geometridae: Lepidoptera)

Published online by Cambridge University Press:  19 September 2011

R. Ramachandran
R. Ramachandran
Affiliation:
Waite Agricultural Research Institute, Glen Osmond, South Australia 5064
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Abstract

In field conditions in South Australia hatching of eggs of Ectropis excursaria showed a morning and an afternoon peak. In the laboratory, hatching coincided with “lights-on” stimulus at 20°C, 10:14 and 12:12 L:D. Increase or decrease of temperature by 5°C shifted the start of hatching to late scotophase while increasing photoperiod shifted a substantial proportion of hatching to later in photophase. Survival of first instars was linearly related to saturation-deficit of the atmosphere.

Résumé

L'eclosion des oeufs de l'Ectropis excursaria sous des conditions naturelles sur le terrain au sud de l'australie a donne des pics dans Ia matinée et l'aprésmidi. Au laboratoire l'eclosion coincidait avec la presence de la lumiere a 20°C, 10:14 et 12:12 LD (lumière et sans lumière). La croissance ou decroissance de la temperature de 5°C a changé le debut de l'eclosion jusqu'a la derniere phase du processus. La photoperiode croissant a changé une proportion substantielle de l'eclosion des oeufs. La survie des larves du premier stage etait relativement reliée à la saturation et deficit de l'atmosphere.

Keywords

Ectropis excursariaphotoperiodthermoperiodfirst instarssurvivalsaturation-deficitEctropis excursariaphotoperiodethermoperiodepremier stage larvairesurviesaturationdeficit
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 10 , Issue 4 , August 1989 , pp. 507 - 511
Copyright
Copyright © ICIPE 1989

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References

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