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Toxicity of Palm Oil to Eggs and Larvae of Callosobruchus maculatus (F.) on Stored Cowpea

  • E. A. Osekre (a1), W. S. K. Gbewonyo (a2) and J. N. Ayertey (a3)


A commercially produced palm oil brand, Palmin oil, was evaluated for its effect on eggs and larvae of Callosobruchus maculatus (F.) (Coleoptera: Bruchidae) on cowpea (Vigna unguiculata) (L.) Walp. Application of 1 μ1 of the oil on eggs deposited on 10 cowpea seeds, or directly on larvae growing inside seeds resulted in their death. Embryo mortality occurred only when the oil was placed at the anterior end of the egg. The nutritive content of cowpea seeds treated with Palmin oil remained unchanged. Furthermore, the oil did not go rancid following six months of storage.

L'huile Palmin, une huile de palme produite pour la commercialisation, a été évaluée pour ses effets sur les oeufs et les larves de Callosobruchus maculatus (F.) (Coleoptera: Bruchidae) sur des graines de niébé, Vigna unguiculata (L.) Walp. Lorsque Ton applique 1 ul d'huile sur des oeufs deposes sur 10 graines de niébé, ou directement sur les larves se développant à l'intérieur des graines, cela provoque leur mort. On observe la mortalité embryonnaire uniquement lorsque l'huile est appliquée sur l'extrémité antérieure de l'oeuf. La qualité nutritive des graines de niébé traitées à l'huile Palmin reste inchangée. En outre l'huile ne rancit pas après 6 mois de conservation.



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Toxicity of Palm Oil to Eggs and Larvae of Callosobruchus maculatus (F.) on Stored Cowpea

  • E. A. Osekre (a1), W. S. K. Gbewonyo (a2) and J. N. Ayertey (a3)


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