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Infestation of maize and sorghum seeds by Sitophilus, Rhizopertha and Sitotroga in three contiguous climatic zones in Nigeria

Published online by Cambridge University Press:  19 September 2011

J. N. Ayertey  and
J. O. Ibitoye
J. N. Ayertey
Affiliation:
Department of Biological Sciences, Bayero University, P.M.B. 3011, Kano, Nigeria.
J. O. Ibitoye
Affiliation:
Federal Department of Pest Control Services, Zaria, Nigeria
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Abstract

Over a 9-month period, samples of maize and sorghum seeds were purchased monthly from markets located in three contiguous climatic zones of Nigeria; the grain samples were examined and insect pests found on them were recorded. Species of Sitophilus, Rhizopertha and Sitolroga accounted for 57–84% of all insect pests collected from the two grain types. Significantly more insect pests were recorded on grains obtained from the southern guinea savannah zone than from the northern guinea and sudan savannah zones. The relative incidence of the insect pests in the three zones is related to moisture availability reflected in grain moisture content.

Résumé

Pendant 9 mois, des achats mensuels de maïs et de sorgho ont été effectué dans trois zones climatiques différentes mais contiguës au Nigeria. Les grains étaient examinés et leurs insectes parasites identifiées. Les trois espèces de Sitophilus, Rhizopertha et Sitotroga comportait 57,84% de toutes les insectes parasites ramassées des deux types de grain. On a noté un nombre beaucoup plus important de ces insectes dans les grain achetés en zone savane sud-guinéene que dans ceux en provenance des savanes nord-guinéene et soudaniene. L'incidence relative des ces insectes parasites dans less 3 zones étudiées est liée à l'humidité atmosphérique et à travers cela au taux d'humidité des grains.

Keywords

SitophilusRhizoperthaSitotrogainfestationdamagemaize and sorghum seedssavannah zonesNigeriagrain moisture
Type
Contributed Papers
Information
International Journal of Tropical Insect Science , Volume 8 , Issue 4-5-6: Recent Advances in Research on Tropical Entomology , December 1987 , pp. 981 - 987
Copyright
Copyright © ICIPE 1987

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