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| Public information campaign on aflatoxin contamination of maize grains in market stores in Benin, Ghana and Togo, James, B., Adda, C., Cardwell, K., Annang, D.*, Hell, K., Korie, S., Edorh, M., Gbeassor, F., Nagatey, K. and Houenou, G., in: Food Additives and Contaminants, volume 24, number 11, pages 1283-1291, 2007. |
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| Relationship between agricultural biodiversity and dietary diversity of children aged 6-36 months in rural areas of northern Ghana, Saaka, M.*, Osman, S. M.* and Hoeschle-Zeledon, I., in: Food & Nutrition Research, volume 61, number 1, pages 1-10, ISSN 1654-6628, 2017. [DOI] |
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| Seed transmission of bean common mosaic virus - blackeye cowpea mosaic strain (BCMV-BlCM) threaten cowpea seed health in the Ashanti and Brong-Ahafo regions of Ghana, Adams, F. K.*, Kumar, P. L., Kwoseh, C.*, Ogunsanya, P., Akromah, R.* and Tetteh, R.*, in: Journal of Horticultural Sciences, volume 16, number 2, pages 251-260, ISSN 0973-354X, 2021. |
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| Selected shade tree species improved cocoa yields in low-input agroforestry systems in Ghana, Asitoakor, B. K.*, Vaast, P., Raebild, A., Ravn, H. P., Eziah, V. Y.*, Owusu, K.*, Mensah, E. O.* and Asare, R., in: Agricultural Systems, volume 202, number -: 103476, pages 1-9, ISSN 0308-521X, 2022. [DOI] |
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| Simple sequence repeat diversity of local cassava varieties from Tanzania, Nigeria, Ghana, Uganda, Sierra Leone: lessons from genetic diversity and differentiation of a vegetatively propagated crop in a secondary center of diversity, Fregene, M.*, Kulaya, A., Suarez, C., Montes, L., Azurdia, C., Raji, B., Okai, E., Kizito, F., Gullberg, U., Castelblanco, W, Gutierrez, J and Buitrago, C., in: Book of Abstracts of the Nighth Triennial Symposium of the International Society for Tropical Root Crops - Africa Branch, 31 October-5 November 2004, Mombasa, Kenya, 2004. |
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| Smallholder farmers' preferences for sustainable intensification attributes in maize production: evidence from Ghana, Kotu, B. H., Oyinbo, O.*, Hoeschle-Zeledon, I., Rahman, N. A., Kizito, F. and Boyubie, B., in: World Development, volume 152, number -: 105789, pages 1-13, ISSN 0305-750X, 2022. [DOI] |
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| Stability studies of hybrid yam (Dioscorea rotundata Poir.) genotypes in Ghana, Otoo, E.*, Okonkwo, C. and Asiedu, R., in: Journal of Food, Agriculture and Environment, volume 4, number 1, pages 234-238, ISSN 1459-0255, 2006. |
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| Stability, agronomic performance and genetic variability of 10 cassava genotypes in Ghana, Peprah, B. B.*, Agyeman, A.*, Parkes, E., Kwadwo, O.*, Isaac, A. K.*, Okogbenin, E.* and Labuschagne, M.*, in: Journal of Plant Breeding and Crop Science, volume 8, number 9, pages 157-167, ISSN 2006-9758, 2016. [DOI] |
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| Status of data on cassava in major producing countries of Africa: Cameroon, Cote d' lvoire, Ghana, Nigeria, Tanzania, Uganda, and Zaire, Nweke, F., Lynam, J.* and Prudencio, C.Y., COSCA working paper, International Institute of Tropical Agriculture (IITA), 1990. |
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| Sulfur status and forms in some surface soils of Ghana, Acquaye, D. K. and Kang, B., in: Soil Science, volume 144, number 1, pages 43-52, 1987. |
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| Survey of the incidence and distribution of viruses infecting yam (Dioscorea spp.) in Ghana and Togo, Eni, A*, Hughes, J.+, Asiedu, R. and Rey, M.*, in: Annals of Applied Biology, volume 156, number 2, pages 243-251, ISSN 0003-4746, 2010. |
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| Sustainable but hungry? Food security outcomes of certification for cocoa and oil palm smallholders in Ghana, Dompreh, E. B., Asare, R. and Gasparatos, A., in: Environmental Research Letters, volume 16, number 5: 055001, pages 1-18, ISSN 1748-9326, 2021. [DOI] |
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| Sustainable intensification of cereal-based farming systems in Ghana's Guinea savanna: constraints and opportunities identified with local communities, Ellis-Jones, J., Larbi, A., Hoeschle-Zeledon, I., Dugje, I.*, Teli, I. A.*, Buah, S. S.*, Kanton, R.*, Kombiok, J. M.*, Kamara, A. and Gyamfi, I., 2012. |
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| Sustainable intensification of smallholder maize production in northern Ghana: the case of cowpea living mulch technology, Rahman, N. A., Larbi, A., Kizito, F., Kotu, B. H. and Hoeschle-Zeledon, I., in: Agronomy Journal, volume 116, number 4, pages 1952-1965, ISSN 0002-1962, 2024. [DOI] |
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| Sustainable soyabean production in northern Ghana: training manual on GAPs for sustainable intensification of soyabean production for agricultural extension agents, Kermah, M., Adjei-Nsiah, S. and Ofosu, A., SSPiNG project, 2022. |
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| Sustainable yam production in Ghana - The non-staking option, Otoo, E.*, Anchirinah, V. M.*, Ennin, S.* and Asiedu, R., in: Journal of Food, Agriculture and Environment, volume 6, number 3-4, pages 391-396, ISSN 1459-0255, 2008. |
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| Technical inefficiency and papaya farm size in west Africa: a stochastic frontier approach on Benin and Ghana data, Adeoti, R., Coulibaly, O., Agossou, D.*, Goergen, G . and Tamo, M., in: International Journal of Agriculture and Environmental Research, volume 2, number 3, pages 471-486, ISSN 2455-6939, 2016. |
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| Testing alternative methods of varietal identification using DNA fingerprinting: results of pilot studies in Ghana and Zambia, Maredia, M. K., Reyes, B., Manu-Aduening, J. A.*, Dankyi, A. A.*, Hamazakaza, P.*, Muimui, K.*, Rabbi, I. Y., Kulakow, P., Parkes, E., Abdoulaye, T., Katungi, E. and Raatz, B., MSU International Development working paper No. 149, 2016. |
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| The adoption problem is a matter of fit: tracing the travel of pruning practices from research to farm in Ghana's cocoa sector, Obeng Adomaa, F., Vellema, S., Slingerland, M. and Asare, R., in: Agriculture and Human Values, volume 35, pages 921-935, ISSN 0889-048X, 2022. [DOI] |
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| The cocoa yield gap in Ghana: a quantification and an analysis of factors that could narrow the gap, Asante, P. A., Rahn, E., Zuidema, P. A., Rozendaal, D. M. A., van der Baan, M. E. G., Laderach, P., Asare, R., Cryer, N. and Anten, N. P. R., in: Agricultural Systems, volume 201, number -: 103473, pages 1-13, ISSN 0308-521X, 2022. [DOI] |
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| The economic impact of climate change on farm decisions and food consumption in Ghana, Etwire, P. M., University of Otago, 2018. |
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| The economics of cowpea seed contracting in Ghana, Martey, E.*, Etwire, P. M.*, Owusu, E. Y.*, Adogoba, D. S.*, Haruna, B.*, Suraj, M. M.* and Omoigui, L., in: African Journal of Science, Technology, Innovation and Development, volume 17, number 3, pages 447-461, ISSN 2042-1338, 2025. [DOI] |
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| The fall armyworm strain associated with most rice, millet, and pasture infestations in the Western Hemisphere is rare or absent in Ghana and Togo, Nagoshi, R. N., Koffi, D.*, Agboka, K.*, Adjevi, A. K. M.*, Meagher, R. L. and Goergen, G ., in: PloS ONE, volume 16, number 6: e0253528, pages 1-16, ISSN 1932-6203, 2021. [DOI] |
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| The first-ever formal release of yam genotypes in Ghana, Otoo, E.* and Asiedu, R., in: African Crop Science Conference proceedings, pages 203-208, 2005. |
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| The impact of certification on the natural and financial capitals of Ghanaian cocoa farmers, Fenger, N., Bosselmann, A., Asare, R. and De Neergaard, A., in: Agroecology and Sustainable Food Systems, volume 41, number 2, pages 143-166, ISSN 1473-5903, 2017. [DOI] |
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| The impact of credit on the technical efficiency of maize-producing households in northern Ghana, Martey, E., Wiredu, A., Etwire, P. M.* and Kuwornu, J. K.*, in: Agricultural Finance Review, pages 1-19, ISSN 0002-1466, 2019. [DOI] |
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| The making of inclusive value chains: insights from service delivery initiatives in Ghana's cocoa chain, Obeng Adomaa, F., Wageningen University & Research, 2023. [DOI] |
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| The performance profile of Dioscorea rotundata cultivar Dorban genotypes in Ghana using GGE biplot analysis, Otoo, E.* and Asiedu, R., in: Journal of Food, Agriculture and Environment, volume 7, number 1, pages 150-155, ISSN 1459-0255, 2009. |
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| The potential of selected shade tree species for managing mirids and black pod disease infection in cocoa agroforestry systems in Ghana, Asitoakor, B. K.*, Raebild, A., Asare, R., Vaast, P., Howe, A. G., Eziah, V. Y.*, Owusu, K.*, Mensah, E. O.*, Kotey, A.* and Ravn, H. P., in: Crop Protection, volume 184, number -: 106810, pages 1-10, ISSN 0261-2194, 2024. [DOI] |
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| The potential of underutilized species to prevent micronutrient deficiencies in northern Ghana, Thiele, L. E., University of Kassel, 2021. |
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| To diversify or not to diversify, that is the question: pursuing agricultural development for smallholder farmers in marginal areas of Ghana, Bellon, M. R.*, Kotu, B. H., Azzarri, C. and Caracciolo, F., in: World Development, volume 125, number -: 104682, pages 1-10, ISSN 0305-750X, 2020. [DOI] |
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| Trade-offs and synergies associated with maize leaf stripping within crop-livestock systems in northern Ghana, Komarek, A. M., Rahman, N. A., Bandyopadhyay, A., Kizito, F., Koo, J. and Addah, W., in: Agricultural Systems, volume 193, number -: 103206, pages 1-13, ISSN 0308-521X, 2021. [DOI] |
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| Trait profile of maize varieties preferred by farmers and value chain actors in northern Ghana, Adu, G. B.*, Badu-Apraku, B., Akromah, R.*, Amegbor, I. K.*, Adogoba, D. S.*, Haruna, A.*, Manigben, K. A.*, Aboyadana, P. A.* and Wiredu, A., in: Agronomy for Sustainable Development, volume 41, number -: 50, pages 1-15, ISSN 1774-0746, 2021. [DOI] |
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| Tree diversity and canopy cover in cocoa systems in Ghana, Asare, R. and Anders, R., in: New Forests, pages 1-16, ISSN 0169-4286, 2015. [DOI] |
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| Trends of rainfall onset, cessation, and length of growing season in northern Ghana: comparing the rain gauge, satellite, and farmer's perceptions, Atiah, W. A.*, Muthoni, F. K., Kotu, B. H., Kizito, F. and Amekudzi, L. K.*, in: Atmosphere, volume 12, number 12: 1647, pages 1-20, ISSN 2073-4433, 2021. [DOI] |
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| Unlocking barriers to adoption and scaling of climate smart cocoa practices in Ghana, Dalaa, M. A., Kofituo, R. K., Amoah, I. A.*, Jassogne, L . and Asare, R., Abstract in, Tropentag, September 18-20, organised by Universities of Kassel and Goettingen, Germany, 2019. |
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| Unmasking gender disparities in cocoa farming: the case of female land ownership in the Ashanti and Western North regions of Ghana, Buabeng, K., Lohr, K., Asare, R. and Sieber, S., in: Journal of Social and Economic Development, pages 1-18, ISSN 0972-5792, 2024. [DOI] |
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| Unravelling drivers of high variability of on-farm cocoa yields across environmental gradients in Ghana, Asante, P. A., Rozendaal, D. M. A., Rahn, E., Zuidema, P. A., Quaye, A. K., Asare, R., Laderach, P. and Anten, N. P. R., in: Agricultural Systems, volume 193, number -: 103214, pages 1-10, ISSN 0308-521X, 2021. [DOI] |
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| Upper canopy tree crown architecture and its implications for shade in cocoa agroforestry systems in the western region of Ghana, Asante, W. A.*, Ahoma, G.*, Gyampoh, B.*, Kyereh, B.* and Asare, R., in: Trees, Forests and People, volume 5, number : 100100, pages 1-9, ISSN 2666-7193, 2021. [DOI] |
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| Using CERES-maize and ENSO as decision support tools to evaluate climate-sensitive farm management practices for maize production in the northern regions of Ghana, MacCarthy, D. S.*, Adiku, S. G. K.*, Freduah, B. S.*, Gbefo, F.* and Kamara, A., in: Frontiers in Plant Science, volume 8, number 31, pages 1-13, ISSN 1664-462X, 2017. [DOI] |
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| Value chain analyses of grain legumes in N2Africa: Kenya, Rwanda, eastern DRC, Ghana, Nigeria, Mozambique, Malawi and Zimbabwe, Rusike, J., van den Brand, G ., Boahen, S., Dashiell, K., Kantengwa, S., Ongoma, J.*, Mongane, D., Kasongo, K.*, Jamagani, Z.*, Aidoo, R.* and Abaidoo, R., 2013. |
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| Value chain analysis of the yam sectors in Ghana and Nigeria, Phillips, D., Boadu, P., Hussein, E.*, Kleih, U. K., Mignouna, D., Ogbonna, M.*, Otoo, E.* and Siwoku, B.*, Abstract, P. 90 in Program and Book of Abstracts, 16th Triennial Symposium of the International Society for Tropical Root Crops: Roots and tubers of development and climate change Abeokuta, Nigeria, Sunday 23-Friday 28 September, 2012. |
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| Variations in yield gaps of smallholder cocoa systems and the main determining factors along a climate gradient in Ghana, Abdulai, I., Hoffmann, P., Jassogne, L., Asare, R., Graefe, S., Tao, H. H., Muilerman, S., Vaast, P., Van Asten, P., Laderach, P. and Rotter, R. P., in: Agricultural Systems, volume 181, number -: 102812, pages 1-8, ISSN 0308-521X, 2020. [DOI] |
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| Viruses and viral diseases of yams in Ghana, Offei, S.*, Olatunde, O., Hughes, J. and Kenyon, L., 2001. |
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| Welfare impacts of climate-smart agriculture in Ghana: Does row planting and drought-tolerant maize varieties matter?, Martey, E.*, Etwire, P. M.* and Abdoulaye, T., in: Land Use Policy, volume 95, number -: 104622, pages 1-10, ISSN 0264-8377, 2020. [DOI] |
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| What role for legumes in sustainable intensification? - case studies in western Kenya and Northern Ghana for ProIntensAfrica, Marinus, W., Ronner, E., van de Ven, G., Kanampiu, F., Adjei-Nsiah, S.* and Giller, K., 2016. |
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| Whiteflies as vectors of plant viruses in cassava and sweetpotato in Africa: Ghana, Cudjoe, A.*, Gyamenah, J. and James, B., Centro Internacional de Agricultura Tropical (CIAT), 2005. |
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| Willingness to pay for biofertilizers among grain legume farmers in northern Ghana, Banka, M.*, Aidoo, R.*, Abaidoo, R. C.*, Fialor, S. C.* and Masso, C., in: Journal of Scientific Research & Reports, volume 19, number 1, pages 1-13, ISSN 2320-0227, 2018. [DOI] |
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| Yam nematodes as production constraints in Ghana: a socio-economic perspective, Whedie, B. O.*, Gurmu, M., Nyaku, S. T.*, Brentu, F. C.*, Ankrah, D.*, Dzidzienyo, D. K.* and Bhattacharjee, R., in: Sustainability, volume 17, number 2: 482, pages 1-20, ISSN 2071-1050, 2025. [DOI] |
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| Yam production in the derived coastal savanna zone of Ghana - Past, Present and Future Prospects, Otoo, E.*, Asiedu, R., Ennin, S.* and Ekpe, E.*, in: Agricultural and Food Science Journal of Ghana, volume 4, pages 301-315, 2005. |
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| Yam production in the derived Coastal Savannah zone of Ghana - past, present and future prospects, Otoo, E.*, Asiedu, R., Ennin, S.* and Ekpe, E.*, in: Proceedings of 9th ISTRC-AB symposium, pages 275-284, Mombasa, Kenya, 2007. |
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| Sensory evaluation: the last hurdle in varietal development of yams (Dioscorea rotundata, poir) in Ghana, Otoo, E.* and Asiedu, R., in: African Journal of Biotechnology, volume 8, number 21, pages 5747-5754, ISSN 1684-5315, 2009. |
|
| Keywords: | Dioscorea; Enzymatic oxidation; farmer participatory breeding; Ghana; yams
|
|
| Adoption of improved cassava varieties in Uganda: implications for agricultural research and technology dissemination, Abele, S., Twine, E., Ntawuruhunga, P., Baguma, Y.*, Kanobe, C. and Bua, A.*, in: African Association of Agricultural Economists Conference, Accra, Ghana, 20-22 August 2007, pages 1-17, 2007. |
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| Application of advanced genomic technologies to accelerate yam breeding (ABSTRACT), Bhattacharjee, R., Lopez-Montes, A., Abberton, M. and Asiedu, R., Abstract in First Global Conference on Yam 'to harness research innovations to unleash the potential of yam', 3-6 October, 2013 Accra, Ghana, 2013. |
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| Application of biotechnology to yam improvement in CSIR-Crops Research Institute (CRI) (ABSTRACT), Quain, M. D., Prempeh, R. N., Agyeman, A., Asibuo, J. Y.*, Parkes, E., Ribeiro, P. F.*, Otoo, E.* and Egnin, M., Abstract, P. 301 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
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| Appropriate farming practices resilience to climate change: case of cassava on non-incineration of a grassy fallow forest of Kisangani (ABSTRACT), Ndonda, A., Mahungu, N. and Frangoie, A., Abstract, P. 155 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
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| Beyond crop technology: the challenge for African rural development?, Ortiz, R. and Hartmann, P., pages 39-72, Forum for Agricultural Research in Africa (FARA), 2003. |
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| Bibliographical synthesis to evaluate nutritive needs for meals for food products and yam bean consumed at the torque mother - child in Benin (ABSTRACT), Djidonou, J. G.*, Adegbola, P. Y.*, Hell, K. and Mensah, G. A.*, Abstract, P. 94 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
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| Biofortification of cassava for pro-vitamin A in Nigeria: a model for collaborative scaling out for reduction of vitamin A deficiency in Africa, Egesi, C. N.*, Olasanmi, B.*, Onyeka, T. J.*, Njoku, D.*, Ogbuekiri, H.*, Okogbenin, E.*, Ilona, P., Parkes, E. and Kulakow, P., Abstract, P. 238 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
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| Boric acid for the suppression of the ant, Anoplolepis tenella and impact on infestations of its tended scale insect, Stictococcus vayssierei in cassava fields, Fotso Kuate, A., Hanna, R., Nanga, S. N., Tindo, M.* and Nagel, P., Abstract, p. 282 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
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| Can primary producers sustainably derive higher financial benefits from direct engagement in mechanized cassava processing?, Bachwengizi, B., Towo, E.*, Mlingi, N.*, Omari, M., Ranaivoson, R.*, Rabemanantsoa, N.* and Abass, A., Abstract, P. 320 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
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| Can we maintain cassava clean seed systems using certification guidelines that incorporate virus testing? A comparison of standard and real-time PCR testing techniques, Shirima, R. R., Fovo, F., Yabeja, J. W. and Legg, J., Abstract, P. 295 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
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| Cassavabase (cassavabase.org): an integrated field breeding and genomics database enables accelerated genetic gain in cassava, Agbona, A ., Rabbi, I. Y., Mueller, L. and Kulakow, P., Abstract, P. 311 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
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| Characterizing the effects of degenerative diseases of cassava and yam, Kumar, P. L., Coyne, D. and Legg, J., Abstract, P. 298 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
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| Clean seed systems: an intervention for the management of cassava virus diseases in sub-Saharan Africa (ABSTRACT), Yabeja, J. W., Mtunda, K.*, Shirima, R. R., Kanju, E. and Legg, J., Abstract in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
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| Cocoa seed multiplication: an assessment of seed gardens in Cameroon, Ghana and Nigeria. STCP Working Paper Series, Asare, R., Afari-Sefa, V., Gyamfi, I., Okafor, C. and Mva Mva, J., number 11, 2010. |
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| Community Phytosanitation: progress in Cassava Brown Streak Control through clean seed, Mtunda, K.*, Ndyetabula, I.*, Legg, J., Ndunguru, J.*, Nwenisongole, A.*, Kaminyoge, F.*, Lwabuti, I.* and Shumbusho, E.*, Abstract, P. 272 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
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| Comparative cost and profit analysis of yam production in Nigeria and Ghana, Mignouna, D., Abdoulaye, T., Alene, A., Asiedu, R., Manyong, V. and Leke, W., Abstract, P. 45 in the program and book of abstracts of the First Global Conference on Yam 'to harness research innovations to unleash the potential of yam', 3-6 October, Accra, Ghana, 2013. |
|
| Comparison of cassava yield variations from four-year continuous cultivation under sole and mixed cropping systems in an ultisol of Eastern Nigeria, Asadu, C.*, Dixon, A.* and Okechukwu, R., Abstract, P. 144 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
|
| Comportement de varietes de manioc en diffusion et en developpement a l'infestation par la cochenille africaine des racines et tubercules Stictoccocus vayssierei Richard (Hemiptera: Coccoidea) dans le Nord Kivu, Eleko, N.*, Munseki, L.*, Hanna, R. and Mahungu, N., Abstract, p. 287 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
|
| Conservation and biodiversity in and around cocoa farms: learning about sustainable cocoa production, a guide for participatory farmer training, Asare, R., David, S. and Sonwa, D., Forest and Landscape Working Paper 12, Forest and Landscape, ISBN 978-87-7903-420-4, 2009. |
|
| Control of weeds using herbicide on cassava crop, Frangoie, A., Mahungu, N., Ndonda, A., Mukendi, D. and Kilumba, N., Abstract, P. 141 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
|
| Design and performance evaluation of an agricultural waste-heated cabinet dryer for cassava processing, Alenkhe, B., Randriamorasata, J.*, Msangi, M., Ranaivoson, R.*, Andrianavalona, V., Kolawole, P. and Abass, A., Abstract, P. 78 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
|
| Determination of Beta-Carotene content of yellow root cassava using iCheckTM Device, Ogungbesan, A. O., Parkes, E., Maroya, N., Aina, O., Iluebbey, P., Agbona, A . and Kulakow, P., Abstract, P. 217 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
|
| Diversity studies on Guinea yam (Dioscorea rotundata) for utilization of genetic resources, Yamanaka, S., Babil, P. K., Matsumoto, R., Oli, M. T., Girma Tessema, G., Bhattacharjee, R., Gueye, B., Abberton, M., Lopez-Montes, A., Muranaka, S., Terauchi, R. and Takagi, H., Abstract, P. 28 in the program and book of abstracts of the First Global Conference on Yam 'to harness research innovations to unleash the potential of yam', 3-6 October, 2013 Accra, Ghana, 2013. |
|
| DNA fingerprinting of yam cultivars from Nigeria and Ghana using microsatellite markers, Bhattacharjee, R., Ogedengbe, O., Lopez-Montes, A., Ikeorgu, J.*, Chamba, E.*, Otoo, E.* and Kumar, P. L., Abstract in First Global Conference on Yam 'to harness research innovations to unleash the potential of yam', 3-6 October, 2013 Accra, Ghana, 2013. |
|
| Domestication and evolutionary dynamics of cultivated yam (Dioscorea cayenensis /D. rotundata complex) in Benin, Dansi, A.*, Adjatin, A.*, Bhattacharjee, R., Asiedu, R., Vodouhe, R., Akouegninou, A.* and Sanni, A.*, Abstract in First Global Conference on Yam 'to harness research innovations to unleash the potential of yam', 3-6 October, 2013 Accra, Ghana, 2013. |
|
| Dry matter determinationin cassava: a better approach, Iluebbey, P., Parkes, E., Agbona, A ., Aina, O. and Kulakow, P., Abstract, P. 214 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
|
| EDITS-Yam: a collaborative research project on the "use of genomic information and molecular tools for yam germplasm utilization and improvement for West Africa", Takagi, H., Terauchi, R., Lopez-Montes, A., Yamanaka, S., Ishizaki, T., Tamiru, M., Natsume, S., Takagi, Hiroki, Babil, P. K., Matsumoto, R., Yamamoto, K., Girma Tessema, G., Gueye, B., Bhattacharjee, R., Muranaka, S., Abberton, M. and Asiedu, R., Abstract, P. 116 in the program and book of abstracts of the First Global Conference on Yam 'to harness research innovations to unleash the potential of yam', 3-6 October, 2013 Accra, Ghana, 2013. |
|
| Effect of different stake portions on cassava mosaic disease expression and yield of three cassava varieties under natural field infection, Smith, I. A., Aina, O., Parkes, E., Iluebbey, P., Agbona, A ., Rabbi, I. Y., Gedil, M. and Kulakow, P., Abstract, P. 276 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
|
| Effect of varieties on the adsorption isotherm of yellow-fleshed cassava root starches, Awoyale, W.*, Sanni, L. O.*, Shittu, T.*, Adegunwa, M.*, Gueye, B. and Kulakow, P., Abstract, P. 215 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
|
| Evaluation of local germplasm for agronomic performance, diseases expression and root qualities, Ayankanmi, T., Kulakow, P., Parkes, E., Rabbi, I. Y., Aina, O., Iluebbey, P. and Ikpan, A., Abstract, P. 196 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
|
| Farm safety interventions in the cocoa sector, Gockowski, J. and David, S., Newsletter: STCP Impact Brief; no. 07, 2007. |
|
| Food quality and future market potential for plantain, plantain hybrids, and cooking bananas in west Africa, Ferris, R. S. B., Ortiz, R., Akele, S.*, Akalumhe, Y. O., Chukwu, U., Crouch, J. H. and Vuylsteke, D., pages 93-107, International Institute of Tropical Agriculture (IITA), 1998. |
|
| Genetic analyses of cassava segregating families for heritability and genetic gain of carotene content and other agronomic traits by parent-offspring regression, Njoku, D.*, Gracen, V. E.*, Offei, S.*, Asante, I.*, Egesi, C. N.* and Kulakow, P., Abstract, P. 226 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
|
| Genetic studies and breeding using next-generation sequencing markers in cassava, Rabbi, I. Y., Delphine, L.*, Kulakow, P., Gedil, M., Hamblin, M. and Jannink, J., Abstract, P. 314 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
|
| Genotype by environment interaction and productivity of new generation cassava genotypes developed for food and industrial uses in Nigeria, Kulakow, P., Aina, O., Parkes, E., Yomeni, M. O., Onyeka, J.*, Olasanmi, B.*, Iluebbey, P., Agbona, A . and Dixon, A.*, Abstract, P. 225 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
|
| Global, regional and local drivers of change in cassava value chains in selected countries in Africa: Implications for upgrading smallholder systems, Rusike, J., Adebayo, A., Abdoulaye, T., Alene, A., Bowser, W. and Manyong, V., Abstract, P. 250 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
|
| Growth and nutrient uptake response of cocoa seedlings (Theobroma cacao) to different growth media at the nursery, Mornyuie, A. O.*, University of Energy and Natural Resources Sunyani Ghana, 2024. |
|
| Identifying Cassava Mosaic Disease Resistant genotypes for industrial and local uses In Sierra Leone, Samura, A. E.*, Massaquoi, F. B.*, Kumar, P. L., Koroma, J. P. C.*, Lahai, M.* and Dixon, A.*, Abstract, P. 286 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
|
| Implementing guide for planting, replanting and tree diversification in cocoa systems, Asare, R. and David, S., Forest and Landscape Working Paper 46, Forest and Landscape, ISBN 978-87-7903-476-1, 2010. |
|
| Improving soil fertility through intercropping, Van Asten, P., Workshop paper presented at COPAL workshop, Kumasi, Ghana, 16-18 March, 2010. |
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| In vitro inhibition of fusarium by Lactic Acid Bacteria (LAB): implication of yam disease control for economic growth in Nigeria, Omodamiro, R. M.*, Ojimelukwe, P. C.*, Asiedu, R. and Omodamiro, O. D.*, Abstract, P. 275 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
|
| Influence of soil moisture stress on vegetative growth and root yield of some selected cassava genotypes under green house condition, Adetoro, N. A., Parkes, E., Oworu, O. O., Aina, O., Iluebbey, P. and Kulakow, P., Abstract, P. 183 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
|
| Initiatives by IITA to pre-empt cassava diseases and climate change to enhance food security in Burundi and Rwanda, Njukwe, E., Ntawuruhunga, P., Bigirimana, S.* and Gashaka, G.*, Abstract, P. 284 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
|
| Landraces genes in cassava improvement, Mahungu, N., Bidiaka, M., Binzunga, B.*, Nluta, S. and Ndombo, N., Abstract, P. 209 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
|
| Maximizing cassava (Manihot esculenta Crantz) stems system in Tropical Africa, Yomeni, M. O., Akoroda, M. O.* and Dixon, A.*, Abstract, P. 158 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
|
| Meeting supply of large volume of improved cassava stems to Nigeria farmers by IITA: challenges, approach and achievements, Okechukwu, R., Tarawali, G. and Fregene, M.*, Abstract, P. 177 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
|
| Modernizing yam breeding for rapid development and deployment of varieties with farmer and consumer preferred traits for value addition and improved food and income security, Lopez-Montes, A., Bhattacharjee, R., Abberton, M. and Asiedu, R., Abstract in First Global Conference on Yam 'to harness research innovations to unleash the potential of yam', 3-6 October, 2013 Accra, Ghana, 2013. |
|
| Molecular-based diversity of the scale insect Stictococcus vayssierei in the Congo Basin: evidence of the existence of a species complex, Doumtsop, A. R. P., Hanna, R., Fomena, A.*, Normark, B. and Tata-Hangy, W., Abstract, p. 281 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
|
| New approaches for Root and Tuber genetic resources conservation and use, Gueye, B. and Abberton, M., Abstract, P. 216 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
|
| Nutritive value of four cassava varieties and their effects in brioler rations, Tewe, O. O.*, Abu, O. A.*, Andrew, I., Iluebbey, P., Mosobalaje, M. A.* and Kulakow, P., Abstract, P. 126 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
|
| Occurrence of sporadic dry root rots caused by Phaeolus manihotis Heim (Basidiomycete; Polyporaceae) on cassava in the Bas-Fleuve district of DR Congo and attempts for its control, Tata-Hangy, W., Bambala, K., Nluta, S., Mukwa, L. and Mahungu, N., Abstract, P. 274 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
|
| Perception of food quality in yams among Nigerian farmers, Otegbayo, B.*, kehinde, A. L.*, Sangoyomi, T.*, Samuel, F. O.* and Okonkwo, C., in: Securing livelihoods through yams: Proceedings of a technical workshop on progress in yam research for development in west and central Africa held in Accra, Ghana, 11-13 September, 2007, pages 147-156, International Institute of Tropical Agriculture (IITA), 2009. |
|
| Pests and diseases associated with yam bean (Pachyrhizus erosus) cultivation at farmers' levels in the central region of Benin, Bouraima, A.*, Sikirou, R.*, Adegbola, P. Y.*, Adjanonhoun, A.*, Zocli, B.*, Gnancadja, L., Sezonlin, M., Hell, K., Ahiou, K.*, Fandohan, P.* and Mensah, G. A.*, Abstract, P. 293 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
|
| Pests and diseases status of local and improved cassava genotypes in selected pilot sites in Cameroon, Tindo, M.*, Njukwe, E. and Tenkouano, A.+, Abstract, P. 285 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
|
| Priorities for research of a global cassava program in sub-Saharan Africa: perspectives of scientists and farmers, Rusike, J., Abdoulaye, T., Hareau, G., Kleinwechter, U., Creamer, B., Pemsl, D., Kirscht, H. and Alene, A., Abstract, P. 251 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
|
| Productivity and field disease reaction of biofortified cassava genotypes in Nigeria, Bello, A. A., Parkes, E., Aina, O., Maroya, N., Kolawole, R.*, Akoroda, M. O.* and Kulakow, P., Abstract, P. 132 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
|
| Progress in the development of clean seed systems for cassava, Legg, J., Yabeja, J. W., Shirima, R. R., Mtunda, K.*, Mwakitwange, F.*, Ndyetabula, I.*, Mkamilo, G.*, Magige, S.*, Good, L. and Kanju, E., Abstract, in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
|
| Response of selected cassava (Manihot esculenta Crantz) genotypes to root inducing hormone, IBA (Indole-3-butyric acid) under 3 growth conditions, Otukpa, S., Rabbi, I. Y., Gueye, B., Abberton, M. and Kulakow, P., Abstract, P. 236 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
|
| Screening of F1 mapping population of yam (Dioscorea alata) for resistance to anthracnose (Colletotrichum gloeosporioides) in the screenhouse and field, Nwadili, C., Bandyopadhyay, R., Bhattacharjee, R., Augusto, J., Lopez-Montes, A. and Onyeka, T. J.*, Abstract in First Global Conference on Yam 'to harness research innovations to unleash the potential of yam', 3-6 October, 2013 Accra, Ghana, 2013. |
|
| Securing livelihoods through yams: proceedings of a technical workshop on progress in yam research for development in west and central Africa held in Accra, Ghana, 11-13 September, 2007, Nkamleu, G. B., Annang, D.* and Bacco, N. M., International Institute of Tropical Agriculture (IITA), 2009. |
|
| Socio-economic analysis of Pachyrhizus erosus in South and Central Benin, Adegbola, P. Y.*, Houessionon, P.*, Lobote, L-A., Badarou, I.*, Alokpai, N., Fandohan, P.* and Mensah, G. A.*, Abstract, P. 242 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
|
| Socio-economic analysis of Yam bean (Pachyrhizuserosus) processing to Gari in Benin, Adegbola, P. Y.*, Houessionon, P.*, Houssou, P.*, Ahouignan, S.*, Olou, D.*, Ahounou, J. L.*, Hell, K., Fandohan, P.* and Mensah, G. A.*, Abstract, P. 241 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
|
| Strategies to enhance the use of inbreds and genetic diversity to produce superior cassava varieties, Okoro, P., Kulakow, P., Rabbi, I. Y., Egesi, C. N.*, Essie, B.*, Asante, I.*, Vernon, G.* and Iduh, J. J.*, Abstract, P. 195 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
|
| Support to Agricultural Research for the Development of Strategic Crops in Africa (SARD-SC), Yomeni, M. O., Mahungu, N., Adebayo, A., Ntawuruhunga, P. and Akem, C., Abstract, P. 176 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
|
| Taro leaf blight disease: solutions for West and Central Africa, Walter, N. L.*, Fornkwa, V., Gueye, B., Hanna, R., Onyeka, J.*, Abberton, M. and Asiedu, R., Abstract, p. 296 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
|
| Technical efficiency analysis of cassava production in Nigeria; implication for increased productivity and competitiveness, Osun, T., Ogundijo, S. D. and Bolariwa, K. O.*, Abstract, P. 304 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
|
| Whole-genome sequencing-based analysis of diversity in Guinea yam (Dioscorea rotundata) breeding materials: a preliminary result, Tamiru, M., Natsume, S., Takagi, Hiroki, Babil, P. K., Yamanaka, S., Lopez-Montes, A., Gedil, M., Bhattacharjee, R., Girma Tessema, G., Takagi, H., Asiedu, R. and Terauchi, R., Abstract in First Global Conference on Yam 'to harness research innovations to unleash the potential of yam', 3-6 October, 2013 Accra, Ghana, 2013. |
|
| Yam farming as a business, Phillips, D., Kleih, U. K., Otoo, E.*, Boadu, P.*, Ogbonna, M.*, Etudaiye, H.*, Mignouna, D. and Siwoku, B.*, Abstract, P. 37 in the program and book of abstracts of the First Global Conference on Yam 'to harness research innovations to unleash the potential of yam', 3-6 October, 2013 Accra, Ghana, 2013. |
|
| Yield and micronutrient uptake of white yam (Dioscorearotundata L. Poir) as influence by organomineral fertilizer ammendment on an alfisol in Ibadan South western Nigeria, Lawal, O. I.*, Adeoye, G.*, Asiedu, R., Ojeniyi, S. O.*, Atayese, M. O.* and Olaiya, A.O.*, Abstract, P. 164 in the book of abstracts and programme of the 12th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB), 30 - 5, October, Alisa Hotel, Accra, Ghana, 2013. |
|
| Evaluation of water yam (Dioscorea alata L.) germplasm for reaction to yam anthracnose and virus diseases and their effect on yield, Egesi, C. N.*, Odu, B., Ogunyemi, S., Asiedu, R. and Hughes, J., in: Journal of Phytopathology, volume 155, number 9, pages 536-543, 2007. |
|
Abstract:
Use of genetic resistance is the most practical and economic way to manage major diseases of yams. In a search for sources of resistance, 40 water yam (Dioscorea alata L.) accessions from Benin, Ghana, Nigeria and Puerto Rico were screened under natural disease infection conditions in Ibadan, Nigeria. The accessions were evaluated at 1, 3 and 6 months after planting (MAP) for severity of yam anthracnose and viral diseases. The effect of the pathogens on yield was also evaluated at harvest 9 MAP. There were significant differences (P < 0.001) between accessions for severities of anthracnose and viral diseases. Eight (20%) of them had lower anthracnose area under disease progress curves (AUDPC) values than the resistant check while 10 (25%) had AUDPC values below the trial mean. There were significant variations (P < 0.001) in yield components among the accessions. There was significant negative correlation of anthracnose severity with fresh tuber yield (r = -0.51) and with number of tubers per plot (r = -0.40). Similarly, significant negative correlations were observed of virus disease severity with fresh tuber yield (r = -0.78) and number of tubers per plot (r = -0.65). Linear regression models also showed that the fresh yield had significant negative relationships with anthracnose (R2 = 0.26) and viral (R2 = 0.62) diseases. The accessions identified as resistant constitute a valuable resource for breeding of resistant germplasm.
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| First report of cucumber mosaic virus in yams (Dioscorea spp.) in Ghana, Togo and Republic of Benin in West Africa, Eni, A., Kumar, P. L., Asiedu, R., Alabi, O., Naidu, R.*, Hughes, J. and Rey, M.*, in: Plant Disease, volume 92, number 5, pages 833, ISSN 0191-2917, 2008. [DOI] |
|
Abstract:
Yam (Dioscorea spp., family Dioscoreaceae) is one of the most important food crops cultivated in the West African yam zone comprising the forest and savannah areas of Nigeria, Ghana, Cote d'Ivoire, Republic of Benin, and Togo, which account for more than 90% of the 4.59 million ha of yam cultivation worldwide (1). A survey was conducted in 2005 to document viruses in yams in Ghana, Togo, and the Republic of Benin. Samples (1,405) from five species of yam showing mosaic, chlorosis, and stunting as well
as asymptomatic plants were tested for Dioscorea bacilliform virus (DBV, genus Badnavirus), Yam mosaic virus (YMV, genus Potyvirus), and Yam mild mosaic virus (YMMV, genus Potyvirus), the three most common viruses infecting yams. In addition, samples were tested for Cucumber mosaic virus (CMV), since CMV was previously reported to infect yams in Cote d'Ivoire (2) and Nigeria (3). In protein-A sandwich-ELISA with polyclonal antibodies to a cowpea isolate of CMV, 23 of the 1,405 samples (6 of 218 samples from Togo, 13 of 628 samples from Ghana, and 4 of 559 samples from Republic of Benin) tested positive for CMV.
The CMV-positive samples were from D. alata (N = 16) and D. rotundata (N = 7), whereas all samples from D. cayenensis, D. dumetorum, and D. bulbifera tested negative. CMV was detected as mixed infections with DBV, YMV, or YMMV in 21 of 23 samples. Some of these samples showed puckering, chlorosis, mottling, and crinkling, whereas some plants infected by two or more viruses were asymptomatic. Only two samples from D. rotundata had a single infection of CMV and they showed mild chlorotic symptoms in young leaves that were inconspicuous in mature leaves. In sap inoculations, the virus induced systemic mosaic in
Nicotiana glutinosa. The presence of CMV in ELISA-positive yam samples was further confirmed by immunocapture-reverse transcription (IC-RT)-PCR using CMV antibodies as trapping antibody and oligonucleotide primers specific for a 485 nt corresponding to 3' end of the coat protein gene and C-terminal noncoding region of RNA-3 (4). To confirm the specificity of ICRT-PCR, the 485-bp amplicons from an isolate from the Republic of Benin was cloned into pCR2.1 (Invitrogen, Carlsbad, CA) and three independent clones were sequenced from both orientations. Pairwise comparison of a consensus sequence (Accession No. EU274471) with corresponding sequences of other CMV isolates deposited in GenBank showed 99% identity at the nucleotide sequence level (Accession No. U22821) and revealed that the CMV isolate from yam belongs to sub-Group IA. To our knowledge,
this is the first report of CMV infection in yams (D. alata and D. rotundata) in Ghana, Togo, and the Republic of Benin. Together with a previous documentation of CMV in D. alata and D. trifida in Cote d'Ivoire and Nigeria (2,3), this report adds to existing knowledge on distribution of CMV in yams with implications for yam production and germplasm distribution in the West Africa Region.
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