Hostname: page-component-586b7cd67f-r5fsc Total loading time: 0 Render date: 2024-11-25T08:07:54.606Z Has data issue: false hasContentIssue false
  • English
  • Français

Entomological Problems of Food Storage in Northern Nigeria

Published online by Cambridge University Press:  10 July 2009

R. W. Howe
R. W. Howe
Affiliation:
Pest Unfestation Laboratory.
Get access Rights & Permissions [Opens in a new window]

Extract

In Nigeria, shelled groundnuts are stored in sacks in covered warehouses and as pyramids in the open air. At the beginning of storage the nuts comprise approximately equal quantities of whole, split and broken nuts of a moisture content of 3·4 per cent. The sacks are exposed to direct hot sun whilst stacking.

The mean monthly maximum shade temperature in Kano ranges from 101°F. in April to 85°F. in January and August and the mean monthly minimum from 75°F. in May to 56°F. in January. Monthly maximum relative humidities range from 100 per cent, in August and September to 45 per cent, in February, and the monthly minimum from 71 per cent, in August to 12 per cent, in February. The range of mean relative humidity is 81 per cent, in August and 18 per cent, in February. Rains fall between April and September, 70 per cent, falling in July and August. Heavy falls are recorded on about 25 days.

Inside warehouses, the maximum monthly temperatures are 102°F. in May and 79°F. in January and February, and minimum temperatures are 81°F. in June, and 58°F. in February. In August the mean relative humidity range is 93 per cent, to 70 per cent. In December it is 34 per cent. to 20 per cent.

Just under the roof of a warehouse and on the surface of pyramids the diurnal range is very large.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 43 , Issue 1 , March 1952 , pp. 111 - 144
Copyright
Copyright © Cambridge University Press 1952

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Corby, H. D. L. (1947). Aphanus (Hem. Lygaeidae) in stored ground-nuts.—Bull. ent. Res., 37, pp. 609–617.CrossRefGoogle Scholar
Golding, F. D. (1946). The insect pests of Nigerian crops and stock.—Spec. Bull. agric. Dep. Nigeria, no. 4, 48 pp.Google Scholar
Herford, G. M. (1935). A key to the members of the family Bruchidae (Col.) of economic importance in Europe—Trans. Soc. Brit. Ent., 2, pp. 1–32.Google Scholar
Hinton, H. E. (1948). A synopsis of the genus Tribolium Macleay, with some remarks on the evolution of its species-groups (Coleoptera, Tenebrionidae).—Bull. ent. Res., 39, pp. 13–55.CrossRefGoogle ScholarPubMed
Kizel, A., Vasil'eva, N. & Tzuigankova, G. (1939). Translocation of moisture in the bulk of stored grain.—C. R. Acad. Sci. URSS, 24, pp. 786–790.Google Scholar
Oxley, T. A. (1950). Grain storage in East and Central Africa.—Colon. Res. Publ., no. 5, 43 pp.Google Scholar
Raichoudhury, D. P. & Jacobs, S. E. (1937). Experiments on the sterility of Ephestia kühniella Z. (Lepidoptera, Phycitidae), in relation to high temperature (30°C.).—Proc. Zool. Soc. Lond., (A) 107, pp. 283–288.Google Scholar
Richards, O. W. & Herford, G. V. B. (1930). Insects found associated with cacao, spices and dried fruits in London warehouses.—Ann. appl. Biol., 17, pp. 367–395.Google Scholar