Hatching Pattern and Survival of First Instars of Ectropis Excursaria (Guenee) (Geometridae: Lepidoptera)

  • R. Ramachandran
Research Article


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 sco top hase 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.

Key Words

Ectropis excursaria photoperiod thermoperiod first instars survival saturation-deficit 


L’eclosion des oeufs de VEctropis excursaria sous des conditions naturelles sur le terrain au sud de l’australie a donne des pics dans la matinée et Paprésmidi. Au laboratoire l’eclosion coïncidait avec la presence de la lumiere a 20° C, 10:14 et 12:12 LD (lumière et sans lumière). La croissance ou décroissance de la temperature de 5°C a changé le debut de l’eclosion jusqu’à la dernière phase du processus. La photoperiode croissant a changé une proportion substantielle de l’eclosion des oeufs. La survie des larves du premier stage était relativement reliée à la saturation et deficit de l’atmosphère.

Mots Clefs

Ectropis excursaria photoperiode thermoperiode premier stage larvaire survie saturation deficit 


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. Beck, S. D. (1983) Insect thermoperiodisrn. A. Rev. Entomol. 28, 91–108.CrossRefGoogle Scholar
  2. Chapman, R. F., Bemays, E. A., Woodhead, S., Padgham, D. E. and Simpson, S. J. (1983) Control of hatching time of eggs of Chilo partellus (Swinhoe) (Lepidoptera: Pyralidae). Bull. entomol. Res. 73, 667–677.CrossRefGoogle Scholar
  3. Raina, A. K. (1982) Daily rhythms in the sorghum shootfly, Atherigona soccata: Oviposition, egg-hatch and adults eclosion. Physiol. Entomoi 7, 65–70.CrossRefGoogle Scholar
  4. Ramachandran, R. (1986) Behaviour of the first instar Ectropis Excursaria (Lepidoptera: Geometridae) in relation to host-finding process. PhD thesis, University of Adelaide.Google Scholar
  5. Ramachandran, R. (1987) Influence of host plants on the wind dispersal and the survival of an Australian geometrid caterpillar. EntomoL exp. Appl 44, 289–294.CrossRefGoogle Scholar
  6. Ramachandran, R. (1988) Experiments on the responses of the larval stages of the geometrid moth Ectropis Excursaria to light and gravity. Entomoi. exp. Appi. 46, 133–140.CrossRefGoogle Scholar
  7. Saunders D. S. (1976) Insect Clocks. Pergamon Press, Oxford.Google Scholar

Copyright information

© ICIPE 1989

Authors and Affiliations

  • R. Ramachandran
    • 1
  1. 1.Waite Agricultural Research InstituteGlen OsmondSouth Australia

Personalised recommendations