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Larval Movement, Feeding and Development of Chilo partellus Swinhoe (Lepidoptera: Pyralidae) on Two Sorghum Cultivars

Published online by Cambridge University Press:  19 September 2011

A. M. Alghali  and
K. N. Saxena
A. M. Alghali
Affiliation:
International Centre of Insect Physiology and Ecology, P.O. Box 30, Mbita, Kenya
K. N. Saxena
Affiliation:
International Centre of Insect Physiology and Ecology, P.O. Box 30, Mbita, Kenya
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Abstract

Studies on larval movement, feeding and development of Chilo partellus Swinhoe were carried out at Mbita, Western Kenya. Larval movement away from the plant was observed during the first and third instars. Plants inoculated at the stems recorded greater larval migration compared to those inoculated at the leaf whorls. Larval feeding was greater on IS 18363 than on IS 2146, but growth rate, weight gain and efficiency of conversion into body substances were greater in IS 2146. Thus it seems that varietal susceptibility to damage by C. partellus is different from varietal suitability for growth of the larvae.

Microscopic examination of stem tissues damaged during larval feeding revealed that feeding was mainly restricted to the pith and that the vascular bundles were hardly affected.

Résumé

Les études ont été menées à Mbita à l'ouest du Kenya sur le mouvement larvaire, l'alimentation et le développement de Chilo partellus Swinhoe. Le mouvement répulsif à portir de lu plante a eu lieu an premier et troisieme stades larvaires. La migration des larves a été plus importante sur les plantes inoculées sur les tiges que sur les plantes inoculées sur les cornets foliaires. L'alimentation larvaire a été beaucoup plus importante sur le cultivar IS 18363 que sur le cultivar IS 2146, le taux de croissance et le pouvoir de conversion en substances du corps ont été plus éléves dans IS 2146. Ainsi donc, il semble que le susceptibilité variétale aux dégâts por Chilo partellus diffère de la suitabilité pour la croissance des larves de C. partellus.

L'examen microscopie des tissues de lu tige endommagés pendant l'alimentation larvaire a montré que l'alimentation était limitee à la moelle et que les vaisseaux étaient intacts et presque pas affectés.

Keywords

Chilo partellusmovementconsumptiongrowthlarval weightsdevelopmental period
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 9 , Issue 1 , February 1988 , pp. 7 - 11
Copyright
Copyright © ICIPE 1988

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References

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