Biology of Cathartus Quadricollis Guerin-Meneville (Coleoptera:Silvanidae) on Some Selected Food Media

  • J. Allotey
  • J. G. Morris
Research Article


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.

Key Words

Carthartus quadricollis developmental period head-capsule width 


L’évolution de Carthartus quadricollis (Guerin-Meneville) était étudiée sous conditions ambiance de laboratoire, sur maïs, sorgho, blé et melon. L’éclosion d’oeuf était 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 têtes. L’accroissement raison des largeurs des têtes rangé de 1,05–1,11 avec un moyen grandiose de 1,2. Cette limite 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 développement de C. quadricollis sur les merchandises selectionnées rangées de 18,80 jours en maïs coupé à 30,70 jours en niébé coupé.

Mots Clés

Carthartus quadricollis période de développement largeurs des têtes 


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Copyright information

© ICIPE 1993

Authors and Affiliations

  • J. Allotey
    • 1
  • J. G. Morris
    • 1
  1. 1.Department of Biological SciencesRivers State University of Science and TechnologyPort HarcourtNigeria

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