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Preliminary observations on the incidence of insect pests and related deterioration in the quality of stored groundnut in some parts of Northern Nigeria

Published online by Cambridge University Press:  19 September 2011

George N. Mbata
George N. Mbata
Affiliation:
Entomology Research Laboratory, Department of Zoology, University of Ibadan, Ibadan
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Abstract

Investigations on storage insects infesting stored groundnuts was carried out in farms, markets, stores and out-door storage sites in order to find out the source of infestation. Farm samples were found to be free from infestation. Freshly harvested groundnuts that were just stacked into pyramids were also free from infestation. However, groundnuts stacked into pyramids at central storage areas of Kano and Gusau were highly infested following a year of storage. Groundnuts from stores and markets were moderately infested. The most abundant and widely distributed insect pests were Tribolium castaneum (Herbst) and Oryzaephilus mercator (Fauvel). Ephestia cautella (Wlk.) constituted less than 1% of insect pests found on the groundnuts, but Plodia interpunctella (Herbst) was absent in out-door pyramid storage.

Groundnuts kept in in-door storage had high moisture content, while nuts from farm and open air pyramid storage had low moisture content. Lipid, peroxide and free fatty acid (F.F.A) values from groundnuts were directly related to the levels of infestation.

Résumé

L'investigation relative aux insectes qui infestent les entrepôts d'arachides a été menée dans des fermes, des marchés et des depôts abrités et non abrités afin de déterminer les sources de l'infestation.

Les échantillons des fermes n'ont pas été infestés. Les arachides fraîchement récoltées et entassées en pyramides étaient également exemptes de l'infestation. Cependant, les arachides entassées en pyramides exposées aux entrepôts centraux de Kano et de Gasau étaient très infestées au bout d'une année de stockage. Les arachides des depôts protégés et des marchés n'étaient que légèrement infestées.

Les insectes pesteux les plus nombreux et connaissant la plus grande distribution étaient les Tribolium castaneum (walker) et les Oryzaephilus mercator (auvel). Les Ephestia cautella constituaient moins de 1, 0% d'insectes pesteux trouvés dans les arachides. Mais les Plodia interpunctella (Hubner) étaient absents dans les entrepôts en pyramides éxposées.

Le degré d'humidité était plus élévé pour les archides provenant des fermes que pour les arachides stockées en plein air. Un rapport direct a été constaté entre le degré d'infestation et les valeurs en Lipides, en éeroxide et en acides grasseux libres.

Keywords

Groundnutsstorage insectsfree fatty acidsperoxideslipidsNorthern Nigeria
Type
Research Articles
Information
International Journal of Tropical Insect Science , Volume 8 , Issue 1 , February 1987 , pp. 15 - 19
Copyright
Copyright © ICIPE 1987

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