Titles (70)Keywords (1)Abstracts (1)
A genetic linkage map of water yam (Dioscorea alata L.) based on AFLP markers and QTL analysis for anthracnose resistance, Mignouna, H., Mank, R., Ellis, T., Van den Bosch, N., Asiedu, R., Abang, M. and Peleman, J., in: Theoretical and Applied Genetics, volume 105, pages 726-735, 2002. [DOI]
 
A technique for grafting water yam (Dioscorea alata), Shiwachi, H ., Ayankanmi, T. and Asiedu, R., in: Paper presented at: Proceedings of the 8th Symposium of the International Society for Tropical Root Crops-Africa Branch, Ibadan, Nigeria, 2003.
 
AFLP marker diversity in water yam (Dioscorea alata L.), Egesi, C. N.*, Asiedu, R., Ude, G., Ogunyemi, S. and Egunjobi, J.*, in: Plant Genetic Resources: Characterization and Utilization, volume 4, number 3, pages 181-187, ISSN 1479-2621, 2006.
 
Agronomic performance and consumer acceptability of improved water yam (Dioscorea alata L.) varieties in the Republic of Benin, Dansi, M.*, Loko, Y.*, Fakorede, J.*, Agre, A. P., Laly, J.*, Amegan, A.*, Ogou, H.*, Adebola, P. O., Yedomonhan, H.* and Dansi, A.*, in: Journal of Agriculture and Food Research, volume 18, number -: 101292, pages 1-12, ISSN 2666-1543, 2024. [DOI]
 
An EST-SSR based genetic linkage map and identification of QTLs for anthracnose disease resistance in water yam (Dioscorea alata L.), Bhattacharjee, R., Nwadili, C., Saski, C. A., Agre, A. P., Scheffler, B. E., Augusto, J., Lopez-Montes, A., Onyeka, T. J.*, Kumar, P. L. and Bandyopadhyay, R., in: PLoS ONE, volume 13, number 10:e0197717, pages 1-16, ISSN 1932-6203, 2018. [DOI]
 
An EST-SSR based genetic linkage map of water yam (Dioscorea alata L.) and identification of QTL (s) for anthracnose disease: proceeding (poster), Bhattacharjee, R., Nwadili, C., Saski, C. A., Scheffler, B. E., Onyeka, J.*, Augusto, J., Lopez-Montes, A., Asiedu, R., Kumar, P. L. and Bandyopadhyay, R., 2016.
 
Analysis of tuber yield- and maturity- related traits in water yam (Dioscorea alata L.), Sartie, A. M., Franco, J. and Asiedu, R., in: Journal of Agricultural Science and Technology B, volume 1, pages 311-322, ISSN 1939-1250, 2011.
 
Assessing food quality in farmer participatory varietal selection of Water Yam (Dioscorea alata L.), Okonkwo, C., Dossou, R.*, Zoupoya, K., N'kpenu, E., Otoo, E.*, Alhassan, A. Y., Echekwu, C. A. and Asiedu, R., in: 9th Triennial Symposium of the International Society for Tropical Root Crops-Africa Branch (ISTRC-AB); October 31 to November 5, 2004, Mombasa, Kenya, 2004.
 
Assessment of water yam (Dioscorea alata L.) landrace varieties for resistance to anthracnose disease, Bakayoko, L., Pokou, D. N., Essis, B. S., Kouakou, A. M., Dibi, K. E. B., Kouassi, A. B., Nzue, B., Koutouan, T. T., Zohouri, P. G., N'guetta, A. S., Agre, A. P., Mondo, J. and Adebola, P. O., in: African Journal of Agricultural Research, volume 18, number 3: 2A80CC368784, pages 178-193, ISSN 1991-637X, 2022. [DOI]
 
Characterization of water yam (D. alata) for existing (amala, boiled yam and pounded yam) and potential food products, Baah, F., 2006.
 
Classification of water yam (Dioscorea alata) landraces by inter-simple sequence repeat (ISSR), Ichitani, K., Onjo, M. and Shiwachi, H ., in: Paper presented at the 104th Conference of the Japanese Society of Breeding, March, 2003.
 
Colchicine-induced variations in survival rate and morphological characteristics of water yam (Dioscorea alata), Ajayi, A. T.*, Adesoye, A. I.*, Asiedu, R. and Sartie, A. M., in: Field and Vegetable Crops Research, volume 47, number 2, pages 485-498, ISSN 1821-3944, 2010.
 
Comparative reliability of screening parameters for anthracnose resistance in water yam (Dioscorea alata), Nwadili, C., Augusto, J., Bhattacharjee, R., Atehnkeng, J., Lopez-Montes, A., Onyeka, T. J.*, Kumar, P. L., Asiedu, R. and Bandyopadhyay, R., in: Plant Disease, pages 1-8, ISSN 0191-2917, 2016. [DOI]
 
Differential effect of hot water treatment on whole tubers versus cut setts of yam (Dioscorea spp.), Coyne, D., Claudius-Cole, A. O.*, Kenyon, L. and Baimey, H., in: Pest Management Science, volume 66, number 4, pages 385-389, ISSN 1526-498X, 2010.
 
Diversity of water yam (Dioscorea alata L.) accessions from Cote d'Ivoire based on SNP markers and agronomic traits, Bakayoko, L., Pokou, D. N., Kouassi, A. B., Agre, A. P., Kouakou, A. M., Dibi, K. E. B., Nzue, B., Mondo, J., Adebola, P. O., Akintayo, O. T., Asfaw, A. and N'guetta, A. S., in: Plants, volume 10, number 12: 2562, pages 1-18, ISSN 2223-7747, 2021. [DOI]
 
Effect of collecting time of scions and treatment of gibberellin and uniconazole-P on the growth of vine cuttings in water yam (Dioscorea alata L.), Matsumoto, R., Shiwachi, H ., Kikuno, H ., Irie, K. and Toyohara, H., in: Japanese Society for Tropical Agriculture, Research for Tropical Agriculture, October 09-10, Okinawa, Japan., pages 51-52, 2010.
 
Effect of collection time of scions and treatment with Gibberellin and Uniconazol-P on the growth of vine cutting in water yam (Dioscorea alata L.), Matsumoto, R., Shiwachi, H ., Kikuno, H ., Irie, K. and Toyohara, H., in: Research for Tropical Agriculture, volume 4, number 1, pages 22-26, 2011.
 
Effect of Etrusion Variables on Extrudates properties of water yam flours - A Response Surface Analysis, Oke, M. O.*, Awonorin, S.*, Sanni, L. O.*, Asiedu, R. and Aiyedun, P. O.*, Abstract in Book of Abstracts of the 11th Triennial Symposium of ISTRC-AB, held at Memling Hotel, Kinshasa. 4-8 October, 2010.
 
Effect of extrusion variables on extrudates properties of water yam flour- a response surface analysis, Oke, M. O.*, Awonorin, S.*, Sanni, L. O.*, Asiedu, R. and Aiyedun, P. O.*, in: Journal of Food Processing and Preservation, pages 1-18, ISSN 0145-8892, 2012. [DOI]
 
Effect of extrusion variables on extrudates properties of water yam flours - a response surface analysis, Oke, M. O.*, Awonorin, S.*, Sanni, L. O.*, Asiedu, R. and Aiyedun, P. O.*, in: Tropical Roots and Tuber Crops and the Challenges of Globalization and Climate Changes. Proceedings of the 11th triennial Symposium of the ISTRC-AB, 4 to 8 October 2010, pages 453-470, ISTRC-AB, Ibadan, Nigeria, 2012.
 
Effect of extrusion variables on residence time, mass flow rate and expansion ratio of water yam starches using response surface methodology, Oke, M. O.*, Awonorin, S.*, Sanni, L. O.*, Asiedu, R. and Aiyedun, P. O.*, Abstract (Poster) in Book of Abstracts of the 11th Triennial Symposium of ISTRC-AB, held at Memling Hotel, Kinshasa. 4-8 October, 2010.
 
Effect of water yam (Dioscorea alata) flour fortified with distiller's spent grain on nutritional, chemical, and functional properties, Awoyale, W., Maziya-Dixon, B., Sanni, L. O.* and Shittu, T.*, in: Food Science & Nutrition, pages 1-10, ISSN 2048-7177, 2015. [DOI]
 
Elite genotypes of water yam (Dioscorea alata) yield food product quality comparable to white yam (Dioscorea rotundata), Adesokan, M., Alamu, E. O., Fawole, S., Asfaw, A. and Maziya-Dixon, B., in: Applied Sciences, volume 14, number 9: 3704, pages 1-15, ISSN 2076-3417, 2024. [DOI]
 
Environmental stability of resistance to anthracnose and virus diseases of water yam (Dioscorea alata), Egesi, C. N.*, Onyeka, T. J.* and Asiedu, R., in: African Journal of Agricultural Research, volume 4, number 2, pages 113-118, ISSN 1991-637X, 2009.
 
Evaluation of phenotypic variation in water yam (Dioscorea alata L.) germplasm using multivariate analysis, Egesi, C. N.*, Asiedu, R., Egunjobi, J.* and Ogunyemi, S., in: Root crops: the small processor and development of local food industries for market economy: proceeding of the Eighth Triennial Syposium of the International Society for Tropical Root Crops - Africa Branch (ISTRC-AB), 12-16 November 2001, Ibadan, Nigeria, pages 461-468, 2003.
 
Evaluation of the performance of five hybrid water yam clones in the yam belt of Nigeria, Ikeorgu, J.* and Asiedu, R., in: Root and tuber crops for poverty alleviation through science and technology for sustainable development: proceedings of the 10th symposium of ISTRC-AB held from 8-12 October, 2007 in Maputo, Mozambique, pages 265-269, ISTRC-AB, 2010.
 
Evaluation of water yam (Dioscorea alata I.) genotypes for reaction to yam anthracnose disease, Ogunyemi, S. and Asiedu, R., in: Proceedings of 9th ISTRC-AB symposium, pages 368-374, Mombasa, Kenya, 2007.
 
Evaluation of water yam (Dioscorea alata L.) genotypes for reaction to yam anthracnose disease, Ogunyemi, S. and Asiedu, R., in: 9th Triennial Symposium of the Internaitonal Society for Tropical Root Crops-Africa Branch (ISTRC-AB); October 31 to November 5, 2004, Mombasa, Kenya, 2004.
 
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.
 
Expanded utilisation of water yam: an approach to poverty alleviation, Onadipe, O. O., Maziya-Dixon, B. and Asiedu, R., in: Root and tuber crops for poverty alleviation through science and technology for sustainable development: proceedings of the 10th symposium of ISTRC-AB held from 8-12 October, 2007 in Maputo, Mozambique, pages 462-463, ISTRC-AB, 2010.
 
Farmer participatory clonal selection of Water Yam (Dioscorea alata) in West Africa, Okonkwo, C., Dossou, R.*, Zoupoya, K., N'kpenu, E., Otoo, E.*, Alhassan, A. Y., Echekwu, C. A. and Asiedu, R., in: 9th Triennial Symposium of the Internaitonal Society for Tropical Root Crops-Africa Branch (ISTRC-AB); October 31 to November 5, 2004, Mombasa, Kenya, 2004.
 
Farmer participatory evaluation of four hybrid water yam clones in the yam belt of Nigeria, Ikeorgu, J.*, Oselebe, H. O.*, Oluwatayo, J.*, Ugwuoke, K.*, Ukpabi, U. J.* and Asiedu, R., 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 225-229, International Institute of Tropical Agriculture (IITA), 2009.
 
Farmers' perceptions and economic advantages of the hot-water therapy for disinfecting seed yams against nematodes in Nigeria, Amegbeto, N. K., Manyong, V., Coulibaly, O. and Asiedu, R., in: Proceedings of the African Crop Science Conference, 22-26 October 2001, Lagos, Nigeria, pages 817-823, African Crop Science Society, 2001.
 
Genetic characterization of some water yam (Dioscorea alata L.) accessions in West Africa with simple sequence repeats, Obidiegwu, J., Asiedu, R., Ene-Obong, E.*, Muoneke, C. O.* and Kolesnikova-Allen, M.+, in: Journal of Food, Agriculture and Environment, volume 7, number 3&4, pages 634-638, ISSN 1459-0255, 2009.
 
Genetic characterization of some water yam (Dioscorea alata L.) in West Africa with simple sequence repeats, Obidiegwu, J., Asiedu, R., Ene-obong, E. E.*, Muoneke, C. O.* and Kolesnikova-Allen, M.+, Abstract (Oral presentation) in Book of Abstracts of the 11th Triennial Symposium of ISTRC-AB, held at Memling Hotel, Kinshasa. 4-8 October, 2010.
 
Genetic diversity of organoleptic properties in water yam (Dioscorea alata L.), Egesi, C., Asiedu, R., Egunjobi, J.* and Bokanga, M., in: Journal of the Science of Food and Agriculture, volume 83, pages 858-865, ISSN 0022-5142, 2003. [DOI]
 
Genome-wide association analysis for tuber dry matter and oxidative browning in water yam (Dioscorea alata L.), Gatarira, C., Agre, A. P., Matsumoto, R., Edemodu, A., Adetimirin, V.*, Bhattacharjee, R., Asiedu, R. and Asfaw, A., in: Plants, volume 9, number 8: 969, pages 1-19, ISSN 2223-7747, 2020. [DOI]
 
Genome-wide association studies for sex determination and cross-compatibility in water yam (Dioscorea alata L.), Mondo, J., Agre, A. P., Asiedu, R., Akoroda, M. O.* and Asfaw, A., in: Plants, volume 10, number 7: 1412, pages 1-18, ISSN 2223-7747, 2021. [DOI]
 
Genomic resources for water yam (Dioscorea alata L.): analyses of EST sequences, De Novo sequencing and GBS libraries, Saski, C. A., Bhattacharjee, R., Scheffler, B. E. and Asiedu, R., in: PLoS ONE, volume 10, number 7(e0134031), pages 1-14, ISSN 1932-6203, 2015. [DOI]
 
Genotype x environment interaction in water yam (Dioscorea alata) yield trials in five yam-growing sites in Nigeria, Egesi, C. N.*, Ogunyemi, S. and Asiedu, R., in: Journal of Genetics and Breeding, volume 59, pages 81-88, 2005.
 
Identification and potential application of RAPD markers for anthracnose resistance in water yam (Dioscorea alata), Mignouna, H., Abang, M., Onasanya, A. and Asiedu, R., in: Annals of Applied Biology, volume 141, pages 61-66, 2002.
 
Identification of QTLs controlling resistance to anthracnose disease in water yam (Dioscorea alata), Agre, A. P., Darkwa, K.*, Olasanmi, B.*, Kolade, O., Mournet, P., Bhattacharjee, R., Lopez-Montes, A ., De Koeyer, D ., Adebola, P. O., Kumar, P. L., Asiedu, R. and Asfaw, A., in: Genes, volume 13, number 2: 347, pages 1-16, ISSN 2073-4425, 2022. [DOI]
 
Identifying mega-environment and targeting water yam genotypes for production in west Africa, Okonkwo, C., Okechukwu, R. and Asiedu, R., in: Root and tuber crops for poverty alleviation through science and technology for sustainable development: proceedings of the 10th symposium of ISTRC-AB held from 8-12 October, 2007 in Maputo, Mozambique, pages 360, ISTRC-AB, 2010.
 
Inheritance of resistance in water yam (Disocorea alata) to anthracnose (Colletotrichum gloeosporioides), Mignouna, H., Green, M. M., Abang, K. R. and Asiedu, R., in: Theoretical and Applied Genetics, volume 103, pages 52-55, ISSN 0040-5752, 2001.
 
Iron toxicity symptoms in yams (Dioscorea spp.) grown in water culture, Shiwachi, H ., Kikuno, H ., Okonkwo, C. and Asiedu, R., in: Tropical Science, volume 46, number 3, pages 160-165, ISSN 0041-3291, 2006. [DOI]
 
Isolation, characterisation and identification of a potyvirus from Dioscorea alata L. (water yam) in Nigeria, Odu, B. O.*, Hughes, J., Shoyinka, S.* and Dongo, L., in: Annals of Applied Biology, volume 134, number 1, pages 65-71, ISSN 003-4746, 1999.
 
Morphological, SSR and ploidy analysis of water yam (Dioscorea alata L.) accessions for utilization of aerial tubers as planting materials, Girma Tessema, G., Gedil, M. and Spillane, C., in: Genetic Resources and Crop Evolution, pages 1-15, ISSN 0925-9864, 2015. [DOI]
 
Multi-trait selection index for simultaneous selection of water yam (Dioscorea alata L.) genotypes, Ouattara, F., Agre, A. P., Adejumobi, I. I., Akoroda, M. O.*, Sorho, F., Ayolié, K. and Bhattacharjee, R., in: Agronomy, volume 14, number 1: 128, pages 1-21, ISSN 2073-4395, 2024. [DOI]
 
Organogenesis versus somatic embryogenesis pathway efficiencies in in vitro propagation of white and water yams, Ossai, C., Balogun, M. and Maroya, N., in: In Vitro Cellular & Developmental Biology - Plant, pages 1-11, ISSN 1054-5476, 2023. [DOI]
 
Pathogenicity of Scutellonema bradys (Steiner and Le Hew) Andrassy on yams (Dioscorea spp.) in Benin and its control using water, neem-leaf extracts and fertilizer, Baimey, H., Coyne, D. and Labuschagne, N.*, in: Oral prsentation at the First PINCNET-Africa Workshop, 21-26 September, Ibadan, Nigeria, 2003.
 
Physicochemical and passing characterisation of water yam (Dioscorea spp.) and relationship with eating quality of pounded yam, Baah, F. D.*, Maziya-Dixon, B., Asiedu, R., Oduro, I.* and Ellis, W.*, in: Journal of Food, Agriculture and Environment, volume 7, number 2, pages 107-112, ISSN 1459-0255, 2009.
 
Plant water status of coco yam in relation to water table depths, Ghuman, B. S. and Lal, R., in: Journal of Root Crops, volume 10, pages 41-50, 1985.
 
Ploidy analysis in water yam, Dioscorea alata L., germplasm, Egesi, C., Pillay, M., Asiedu, R. and Egunjobi, J.*, in: Euphytica, volume 128, number 2, pages 225-230, 2002.
 
Possibility of early-season culture of water yam (Dioscorea alata L.) in Yaku island, Onjo, M., Shiwachi, H . and Hayashi, M., in: Kagoshima University Research Center for the Pacific Islands Occasional Papers, volume 38, pages 43-46, 2003.
 
Potential health benefits of water yam (Dioscorea alata), Dufie, W.*, Oduro, I.*, Ellis, W.*, Asiedu, R. and Maziya-Dixon, B., in: Food and Function, volume 4, pages 1496-1501, ISSN 2042-6496, 2013. [DOI]
 
Prediction of the suitability of water yam (Dioscorea alata) for amala product using pasting and sensory characteristics, Wireko-Manu, F. D.*, Ellis, W.*, Oduro, I.*, Asiedu, R. and Maziya-Dixon, B., in: Journal of Food Processing and Preservation, pages 1-7, ISSN 0145-8892, 2013. [DOI]
 
Processing characteristics and sensory analysis of water yam, Ogunyemi, S., Asiedu, R., Egunjobi, J.* and Bokanga, M., in: Proceedings of the African Crop Science Conference, 22-26 October 2001, Lagos, Nigeria, pages 513-517, African Crop Science Society, 2001.
 
Quantification of endogenous phytochemicals and determination of their exogenous effects in somatic embryogenesis pathways of white and water yams, Ossai, C., Balogun, M., Maroya, N. and Sonibare, M. A.*, in: In Vitro Cellular & Developmental Biology-Plant, volume 59, pages 29-38, ISSN 1054-5476, 2023. [DOI]
 
Reaction of Dioscorea alata (water yam) to anthracnose disease in Nigeria, Aduramigba-Modupe, A.O., Asiedu, R. and Odebode, C. A.*, in: Journal of Food, Agriculture and Environment, volume 6, number 3-4, pages 248-252, 2008.
 
Relationship between dormancy and its release and external factors in tubers of water yam (Dioscorea alata L.), Park, B., Onjo, M., Tominaga, s., Shiwachi, H . and Hayashi, M., in: Japanese Journal of Tropical Agriculture, volume 47, pages 42-50, 2003.
 
Resistance of water yam to anthracnose disease in Nigeria, Aduramigba-Modupe, A.O., Asiedu, R., Odebode, C. A.* and Oladiran, A., in: Proceedings of the African Crop Science Conference, 22-26 October 2001, Lagos, Nigeria, pages 483-486, African Crop Science Society, 2001.
 
Screening of new improved water yam (Dioscorea alata) genotypes of the preparation of amala in Nigeria, Ukpabi, U. J.*, Omodamiro, J. G.*, Ikeorgu, J.* and Asiedu, R., in: Root and tuber crops for poverty alleviation through science and technology for sustainable development: proceedings of the 10th symposium of ISTRC-AB held from 8-12 October, 2007 in Maputo, Mozambique, pages 259-265, ISTRC-AB, 2010.
 
Screening of water yam (Dioscorea alata L.) genotypes for reactions to viruses in Nigeria, Odu, B., Asiedu, R., Shoyinka, S.* and Hughes, J., in: Journal of Phytopathology, volume 154, number 11-12, pages 716-724, ISSN 0931-1785, 2006.
 
Sensory evaluation of amala from improved water yam (Dioscorea alata) genotypes in Nigeria, Ukpabi, U. J.*, Omodamiro, R. M.*, Ikeorgu, J.* and Asiedu, R., in: African Journal of Biotechnology, volume 7, number 8, pages 1134-1138, ISSN 1684-5315, 2008.
 
Severity of anthracnose and virus diseases of water yam (dioscorea alata L.) in NIgeria I: effects of yam genotype and date of planting, Egesi, C. N.*, Onyeka, T. and Asiedu, R., in: Crop Protection, volume 26, number 8, pages 1259-1265, ISSN 0261-2194, 2007.
 
Studies on Colletotrichum gloeosporioides (Penz) species complex distribution in six states of Nigeria and status on some selected water yam (Dioscorea alata L.) accessions, Asibe, F. A.*, Federal University of Agriculture, 2023.
 
Variation in pasting and functional properties of flours and starches from water yam (Dioscorea alata), Oke, M. O.*, Awonorin, S.*, Asiedu, R., Maziya-Dixon, B. and Sanni, L., 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 269-278, International Institute of Tropical Agriculture (IITA), 2009.
 
Water yam (Dioscorea alata L.) growth and tuber yield as affected by rotation and fertilization regimes across an environmental gradient in west Africa, Pouya, N., Hgaza, V. K., Kiba, D. I., Bomisso, L., Aighewi, B., Ake, S. and Frossard, E., in: Agronomy, volume 12, number 4: 792, pages 1-22, ISSN 2073-4395, 2022. [DOI]
 
Water yam (Dioscorea alata), a neglected crop with high potential in West Africa, Okonkwo, C., Adeniji, M. and Asiedu, R., in: 9th Triennial Symposium of International Society for Tropical Root Crops-Africa Branch (ISTRC-AB); October 31 to November 5, 2004, Mombasa, Kenya, 2004.
 
Yield stability of water yam (Dioscorea alata L) landraces compared to improved varieties across multiple environments and their culinary qualities in the Republic of Benin, Dansi, M.*, Loko, Y.*, Codija, E*, Fakorede, J.*, Agre, A. P., Amegan, A.*, Adomou, A.*, Dassou, G. H.* and Dansi, A.*, in: JSFA Reports, pages 1-11, ISSN 2573-5098, 2025. [DOI]
 
Environmental stability of resistance to anthracnose and virus diseases of water yam (Dioscorea alata), Egesi, C. N.*, Onyeka, T. J.* and Asiedu, R., in: African Journal of Agricultural Research, volume 4, number 2, pages 113-118, ISSN 1991-637X, 2009.
 
Keywords:Colletotrichum gloeosporioides; genotype x environment (G x E) interaction; stable resistance; water yam; yam anthracnose; yam mosaic virus

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.