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Diapause Termination of Chilo partellus (Swinhoe) and Chilo orichalcociliellus Strand (Lepidoptera: Pyralidae)

Published online by Cambridge University Press:  19 September 2011

V. C. Ofomata ,
W. A. Overholt  and
R. I. Egwuatu
V. C. Ofomata
Affiliation:
Department of Biological Sciences, Nnamdi Azikiwe University, Awka, Anambra State, Nigeria
W. A. Overholt*
Affiliation:
International Centre of Insect Physiology and Ecology (ICIPE), P.O. Box 30772, Nairobi, Kenya
R. I. Egwuatu
Affiliation:
Department of Biological Sciences, Nnamdi Azikiwe University, Awka, Anambra State, Nigeria
*
Corresponding author: WAO. E-mail: [email protected]
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Abstract

The intensity of diapause of field-collected diapausing larvae of Olilo partellus (Swinhoe) and Chilo orichalcociliellus Strand (Lepidoptera: Pyralidae) was compared in the laboratory at 28 ± 0.5°C under a photoperiod of 12:12 (L:D)h. Chilo partellus terminated diapause faster than C. orichalcociliellus. Mean time to diapause termination was 9.7 days for C. partellus and 14.4 days for C. orichalcociliellus. Male and female C. partellus larvae terminated diapause and adults emerged at the same time, while significant differences were found in diapause termination and in emergence times between male and female C. orichalcociliellus.

Résumé

L'intensité de diapause a été comparée chez les larves diapausantes de Chilo partellus (Swinhoe) et de Chilo orichalcociliellus Strand (Lepidoptera: Pyralidae), collectées des champs, dans des conditions de laboratoire à 28 ± 0.5°C et une photopériode de 12:12 heures. Chilo partellus bouclait sa diapause plus rapidement que C. orichalcociliellus. La durée moyenne de diapause était de 9,7 jours chez les larves de C. partellus contre 14,5 jours pour C. orichalcociliellus. Toutes les larves mâles et femelles de C. partellus traversaient la diapause et les adultes émergeaient en même temps, tandis que l'on observait une différence significative dans les intervalles de diapause et d'émergence entre mâles et femelles de C. orichalcociliellus.

Keywords

Chilo partellusChilo orichalcociliellusdiapause terminationChilo partellusChilo orichalcociliellusboucle de la diapause
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 19 , Issue 2-3 , September 1999 , pp. 187 - 191
Copyright
Copyright © ICIPE 1999

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