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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/1260

Title: Susceptibility of Five Cowpea (Vigna Unguiculata) Varieties to Attack by Callosobruchus Maculatus (Fab.) [Coleoptera: Bruchidae]
Authors: Adam, J. I.
Baidoo, P. K.
Issue Date: Dec-2008
Publisher: Journal of Ghana Science Association
Citation: Journal of Ghana Science Association, vol. 10, no. 2
Abstract: Cowpea is a rich source of protein and carbohydrates in the diets of many people in developing countries. The seed, however, suffers considerable damage during storage through infestation by the cowpea weevil, Callosobruchus maculatus (Fab.). Five improved varieties of cowpea (Vigna unguiculata) namely Asontem (IT82D-32), Bengpla (IT83S-818), Soronko (TVX2724-01F), Asetenapa (IT81 D-1951) and Adorn (CR-06-07) released by the Crops Research Institute of the CSJR for cultivation in Ghana were screened for susceptibility to the cowpea beetle, C. maculatus, in storage for a period of 30 days in the laboratory at an ambient temperature of 27.5 ± 0.9°C and relative humidity of 64.6 ± 2%. Each variety was placed in a plastic bag and kept in a freezer at 5°C for 24 hours to eliminate C. maculatus infestations coming from the field. Two hundred grammes of each cowpea variety was placed in a glass container and each infested with a male and female C. inaculatus that were reared in the laboratory. The set up was left in the laboratory until 30 days after infestation. The total number of weevils that emerged and the developmental period were re- corded. The susceptibility index was determined for each variety based on the total number of F, adults that emerged and their developmental periods. Susceptibility indices were 17.58 ± 1.16, 16.75 ± 1.81, 15.81 ± 2.08, 14.02 ± 0.62, 12.84 ± 0.53 for Bengpla, Asontem, Soronko, Asetenapa and Adom respectively. Mean developmental period was highest in Adorn (26.70 ± 0.49), followed by Asontem (26.30 ± 1.20), Asetenapa, (25.5 ± 0.89), Bengpla (23.90 ± 0.40) and Soronko (23.50 ± 0.00). To reduce post-harvest losses of cowpea, it is recommended that the cultivation of Adorn which was the least susceptible amongst the five varieties be encouraged.
Description: This article was published in 2008 by the Journal of Ghana Science Association
URI: http://hdl.handle.net/123456789/1260
Appears in Collections:College of Science

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