Advertisement

Preliminary Observations on the Incidence of Insect Pests and Related Deterioration in the Quality of Stored Groundnut in Some Parts of Northern Nigeria

  • George N. Mbata
Research Article

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.

Key Words

Groundnuts storage insects free fatty acids peroxides lipids Northern Nigeria 

Résumé

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

Les échantillons des fermes n’ont pas été infestés. Les arachides fra⪘hement récoltées et entassées en pyramides étaient également exemptes de l’infestation. Cependant, les arachides entassées en pyramides exposées aux entrepots centraux de Kano et de Gasau étaient très infestées au bout d’une année de stockage. Les arachides des depots 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 entrepots 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.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. Corby H. D. L. (1947) Aphanus (Hemiptera: Lygaeidae) in stored groundnuts. Bull, ent Res. 37, 609–617.CrossRefGoogle Scholar
  2. Davey P. M. (1958) The groundnut bruchid, Caryedon gonagra (F.) Bull. ent. res. 49, 385–404.CrossRefGoogle Scholar
  3. Davey P. M. and Elcoate S. (1966) Moisture content/relative humidity equilibrium of tropical stored produce Part II oil seeds. Trop stored Prod. Inf. 12, 495–512.Google Scholar
  4. Davey P. M., Hall D. N., Conveney P. L. K., Raymond W. D. and Squires F. (1959) The effect of insect infestation on the quality of decorticated groundnuts with special reference to storage at high and low humidities. Trop. sci. 1, 296.Google Scholar
  5. Duerden J. C. and Cutler J. R. (1957) The storage of groundnuts under tropical conditions: 1. The effect of prolonged storage on undecorticated and decorticated groundnuts. J. Sci. Food. Agric. 8, 600–604.CrossRefGoogle Scholar
  6. Fairchild P. L. K., Raymond W. D. and Spikett R. G. W. (1954) Insect infestation of West African groundnuts. Colonial Plant Animal Prod. 4, 330–373.Google Scholar
  7. Halliday D. (1967) Build up of free fatty acid in Northern Nigerian groundnuts. Trop. Sci. 9, 211–237.Google Scholar
  8. Halliday D. (1969) Lipolysis in groundnuts stored in bulk drums. Tech. Rep. Nigerian Stored Prod. Res. Inst. No. 7 in A. Rep. for 1967, pp. 67–71.Google Scholar
  9. Howe R. W. (1952) Entomological problems of food storage in Northern Nigeria. Bull. ent. Res. 43, 111–144.CrossRefGoogle Scholar
  10. Morah S. C. and Comes M. A. (1979) A study of the infestation and pest control effect on groundnuts stored in standard pyramids in Kano. Tech. Rep. Nigerian Stored Prod. Res. Inst. No. 6 in A. Rep. for 1967–77, pp. 69–74.Google Scholar
  11. Osuji F. N. C. (1974) Comparative studies on the susceptibilities of different genera of dried fish to infestation by Dermestes maculatus and Necrobia rufipes. Nigerian J. Ent. 1, 63–68.Google Scholar
  12. Prevett P. F. (1964) The distribution of insects in stacks of bagged groundnuts in Northern Nigeria. Bull. ent. Res. 54, 689–713.CrossRefGoogle Scholar
  13. Prevett P. F., Udo, G., Kazaure, I., Morah S. C, Iwugoh, M., Onyuchi J. N. and Nwandu P. E. (1961) A study of the populations of Tribolium spp. and moth in groundnut pyramids at Kano. Rep. W. Afr. Stored Prod. Res. Unit 1960, 31–34.Google Scholar
  14. Prevett P. F. and Halliday D. (1965) The infestation of groundnuts as received from buying stations. Tech. Rep. Nigerian Stored Prod. Res. Inst. No. 9 in A. Rep. for 1963, pp. 82–84.Google Scholar
  15. Qureshi A. A. and Halliday D. (1965) A record of stored product pests caught in a suction trap operated at dusk at the Nassarawa groundnut stacking area, Kano. Tech. Rep. Nigerian Stored Prod. Res. Inst. No. 4 in A. Rep. for 1964, pp. 31–34.Google Scholar
  16. Solomon M. E. (1945) Tryoglyphid mites in stored products. Nature and amount of damage to wheat. Ann. appl. Biol. 33, 280.CrossRefGoogle Scholar
  17. Yeoh G. H. (1978) A collaborate study of uniform test methods for palm oil. Planter Kuala Lumper 54, 461–474.Google Scholar

Copyright information

© ICIPE 1987

Authors and Affiliations

  • George N. Mbata
    • 1
  1. 1.Entomology Research Laboratory, Department of ZoologyUniversity of IbadanIbadanNigeria

Personalised recommendations