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Survival and development of Chilo partellus (Swinhoe) on sorghum cultivars

Published online by Cambridge University Press:  08 April 2017

A. H. Duale
Affiliation:
International Centre of Insect Physiology and Ecology (ICIPE), P.O. Box 30, Mbita, South Nyanza, Kenya
K. V. Seshu Reddy
Affiliation:
International Centre of Insect Physiology and Ecology (ICIPE), P.O. Box 30, Mbita, South Nyanza, Kenya
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Abstract

Survival and development of Chilo partellus were studied on five sorghum cultivars (IS-18363, IS-18520, ICS-1, ICS-2 and IS-4660) in the laboratory at Mbita Point Field Station, Kenya, at 26 ± 2°C and 65 ± 5% RH. Larval developmental period differed significantly on different cultivars. Number of instars was numerically greater for the females than for the males on all cultivars. Average pupal weight varied with sex; females were twice as heavy as males. The pupal period was longer for males than for females on all cultivars, with the exception of ICS-1, where the pupal period of males was equal to that of females. Ovipositional period was significantly longer on IS-18520 (5.18 ± 0.30 days) than on other cultivars. The shortest ovipositional period (3.70 ± 0.27 days) was recorded on IS-4660. There were no statistically significant differences in adult longevity. Sex ratio of the moths also did not affect the adult longevity of C. partellus reared on the five sorghum cultivars. The variations found in the development of C. partellus on different cultivars were attributed to the nutritional value of the food source.

Résumé

La survie et le développement de Chilo partellus sur cinq cultivars de sorgho (IS-18363, IS-18520, ICS-1, ICS-2 et IS-4660) ont été étudiés au laboratoire à la Station de Mbita, Kenya, à 26 ± 2°C et 65 ± 5% HR. La période de développement larvaire a différé significativement pour les différentes cultivars. Les femelles ont dominé numériquement par rapport aux mâles au niveau des stades pour tous les cultivars. Les poids moyen de la pupe a varié avec le sexe; les femelles étaient deux fois plus lourdes que les mâles. La période pupale a été plus longue pour les mâles que pour les femelles chez tous les cultivars, à l'exception de ICS-1, chez lequel la période pupale des mâles a été égale à celle des femelles. La période de ponte d'oeufs a été significativement plus longue sur IS-18520 (5.18 ± 0.30 jours) que sur les autres cultivars. La plus courte période de ponte d'oeufs (3.70 ± 0.27 jours) a été enregistrée sur IS-4660. Il n'y a pas eu de différences statistiquement significatives en ce qui concerne la longevité des adultes. Le sex ratio des papillons de nuit n'a pas aussi affecté la longevité de C. partellus élevée sur les cinq cultivars de sorgho. Les variations mises en évidence au cours du développement de C. partellus ont été attribuées à la valeur nutritive de la source de nourriture.

Type
Research Articles
Copyright
Copyright © ICIPE 1995

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References

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