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Laboratory evaluation of piper guineense for the protection of cowpea against callosobruchus maculatus



Laboratory evaluation of piper guineense for the protection of cowpea against callosobruchus maculatus



Insect Science & its Application 9(1): 55-60



The efficacy of the powder and volatile oil of Piper GuineenseSchum and Thonn at protecting cowpea against seed beetle, Callosobruchus maculatus (F.) was tested in the laboratory. At low concentrations the powder signifcinatly reduced oviposition and adult emergence while oviposition was completley suppressed at a higher concentration of 42%. The same concentration proided adequate protection for the same amount of cowpea placed in containers of different volumes. The powder, however, did not show any fumigant effect. Volatile oil at 0.002 and 0.005% significantly reduced oviposition and adult emergence, while oviposition was completely suppressed at 0.02% and above. Weight loss of seeds at 90 days after treatment with volatile oil decreased as concentration of the oil increased. The practical significance of the results in small scale storage of cowpea is discussed.

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Accession: 005787809

Download citation: RISBibTeXText

DOI: 10.1017/s1742758400010031


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