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Toxic effects of groundnut oil on the rice weevil Sitophilus oryzae(L.)

Published online by Cambridge University Press:  19 September 2011

M. F. Ivbijaro
Affiliation:
Department of Agricultural Extension, University of Ibadan, Ibadan, Nigeria

Abstract

On exposure of maize grains mixed with groundnut oil at a dose of 20 ml/kg, 100% mortality of the rice weevil, Sitophilus oryzae (L.) was observed within 24 hr and 100% at 10 and 5 ml/kg in 2 and 3 days.

Egg-laying and progeny development in the rice weevils were completely prevented at groundnut oil doses other than 1 ml/kg at which the number of eggs laid and progeny developed were 27 and 38% of those in the oil-free control during the same period. When maize treated with oil at 10–20 ml/kg was reinfested after 19 weeks with fresh adult rice weevils, less than 42% of them had died. The total number of progeny that emerged on week 23 from the two higher doses of oil was 38% of that emerging from the control.

Groudnut oil does not affect the viability of maize grains and damage after 25 weeks. Viability of maize grains was only 6–13% after oil treatment at 10–20 ml/kg compared to 100% in the untreated control.

Type
Research Article
Copyright
Copyright © ICIPE 1984

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References

Goosens, H. J. (1949) A method for staining insect egg plugs in wheat. Cereal Chem. 26, 419420.Google Scholar
Ivbijaro, M. F. (1984) Groundnut oil as a protectant of maize from damage by the maize weevil, Sitophilus zeamais Motsch. Protect. Ecol. In press.Google Scholar
Mital, H. C. (1971) Protection of cowpeas from insect infestation with the aid of fixed oils. J. W. Afr. Sci. Ass. 16, 4548.Google Scholar
Schoonhoven, A. V. (1978) Use of vegetable oils to protect stored beans from bruchid attack. J. econ. Ent. 71, 254256.CrossRefGoogle Scholar
Singh, S. R., Luse, R. A., Leuschner, K. and Nangju, D. (1978) Groundnut oil treatment for the control of Callosobruchus maculatus (F) during cowpea storage. J. Stored Prod. Res. 14, 7780.CrossRefGoogle Scholar
Yuntai, Q. and Burkholder, W. E. (1981) Protection of stored wheat from the granary weevil by vegetable oils. J. econ. Ent. 74, 502505.Google Scholar

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