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Biology of Cathartus quadricollis Guerin-Meneville (Coleoptera: Silvanidae) on some selected food media

Published online by Cambridge University Press:  19 September 2011

J. Allotey  and
J. G. Morris
J. Allotey
Affiliation:
Department of Biological Sciences, Rivers State University of Science and Technology, Nkpolu, Port Harcourt, Nigeria
J. G. Morris
Affiliation:
Department of Biological Sciences, Rivers State University of Science and Technology, Nkpolu, Port Harcourt, Nigeria
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Abstract

The life cycle of Cathartus quadricollis (Guerin-Meneville) was studied under ambient laboratory condition on maize, sorghum, wheat, cowpea and melon. Egg hatchability was found to be 95.5% with an incubation period of 3–7 days. Five larval instars were recorded based on head-capsule width measurements. The growth ratio of the head-capsule width ranged from 1.05–1.20 with a grand mean of 1.12. This range falls within the acceptable range in Dyar's rule. The mean growth rate of C. quadricollis after 2 weeks of rearing on maize, sorghum, melon, wheat and cowpea, ranged from 22.4 to 1.6. While the mean developmental periods of C. quadricollis on the selected food media ranged from 18.80 days on cut maize to 30.70 days on cut cowpea.

Résumé

L'évolution de Carthartus quadricollis (Guerin-Meneville) était étudiée sous conditions ambiance de laboratoire, sur maīs, sorgho, blé et melon. L'éclosion d'oeuf ctait de 95,5% avec une période d'incubation de 3 à 7 jours. On a noté cinq phases morphologiques larvaires basés sur les mesures des largeurs des tétes. L'accroissement raison des largeurs des têtes rangé de 1,05–1,11 avec un moyen grandiose de 1, 2. Cette llmite se conformait à la loi de Dyar. La moyenne vitesse de croissance de C. quadricollis après deux semaines d'élever sur maïs, sorgho, melon, blé et niébé, rangée de 22,4 à 1,6. Tandis que les périodes moyennes developpement de C. quadricollis sur les merchandises selectionnées rangées de 18,80 jours en maïs coupé à 30,70 jours en niébé coupé.

Keywords

Carthartus quadricollisdevelopmental periodhead-capsule widthCarthartus quadricollispériode de developpementlargeurs des tétes
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 14 , Issue 1 , February 1993 , pp. 61 - 68
Copyright
Copyright © ICIPE 1993

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