Titles (57)Keywords (3)Abstracts (4)
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]
 
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.
 
An in invtro cassava-innoculation method for the selection of anthracnose-resistant cultivars, Bruggen, P., Maraite, H. and Hahn, S. K., in: In: Tropical Root Crops: Root Crops and the African Food Crisis; Proceedings of the Third Triennial Symposium of the International Society for Tropical Root Crops - Africa Branch, pages 113-116, IDRC, 1987.
 
Anthracnose disease of yams in West Africa: recent advances in research and future perspectives, Abang, M., Asiedu, R., Mignouna, H., Green, K., Wolf, G. and Winter, 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 562-571, 2003.
 
Anthracnose of cowpea, Williams, R. J., Abstract of papers presented at the Third Annual Conference of the Nigerian Society for Plant Protection, Ministry of Agriculture and Natural Resources, Benin City, Nigeria, February 12-14, 1973, 1975.
 
Anthracnose: an economic disease of cassava in Africa, Fokunang, C.*, Ikotun, T.*, Tembe, E.*, Akem, C. and Asiedu, R., in: Pakistan Journal of Biological Sciences, volume 4, number 7, pages 920-925, 2001.
 
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]
 
Availability of sorghum germplasm with multiple resistance to anthracnose and grey leaf spot in Nigeria, Marley, P., Bandyopadhyay, R., Tabo, R. and Ajayi, O., in: Tropical Science, volume 41, pages 44-49, 2001.
 
Biochemical defense arsenal, genes/QTLs and transcripts for imparting anthracnose resistance in common bean (Phaseolus vulgaris L.), Shafi, S.*, Tahir, M.*, Bawa, V.*, Jan, F.*, Choudhary, N.*, Khan, M. A.*, Singh, Y., Kumar, U.*, Bhat, B. A.*, Dar, W. A.*, Sofi, P. A.*, Bhat, M. A.*, Padder, B. A.*, Shikari, A. B.*, Paliwal, R., Varshney, R. K. and Mir, R. R.*, in: Plant Stress, volume 14, number -: 100609, pages 1-19, ISSN 2667-064X, 2024. [DOI]
 
Characterization of some fungal pathogens causing anthracnose disease on yam in Cross River State, Nigeria, Okon, N. I.*, Markson, A. A. A.*, Okon, E. I.*, Ita, E. E.*, Uyoh, E. A.*, Ene-Obong, E. O. E.* and Ntui, V. O., in: PloS ONE, volume 17, number 6: e0270601, pages 1-19, ISSN 1932-6203, 2022. [DOI]
 
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]
 
Comparison of varietal reactions to cowpea anthracnose in field plot and detached petiole in inoculations, Williams, R. J., Abstracts of papers presented at 66th Annual Meeting of A.P.S. and 40th Session Canadian Phytopathological Society, Vancouver, Canada. p.87, 1974.
 
Current status of yam anthracnose disease in various agroecological zones of Nigeria., Onyeka, T. J.*, Zandjanakou-Tachin, M., Bandyopadhyay, R., Asiedu, R. and Ikeorgu, J.*, Abstract (Poster) in Book of Abstracts of the 11th Triennial Symposium of ISTRC-AB, held at Memling Hotel, Kinshasa. 4-8 October, 2010.
 
Detection of RAPD markers-linked to resistance to cassava anthracnose disease, Akinbo, O., Gedil, M., Ekpo, E.*, Oladele, J. and Dixon, A., in: African Journal of Biotechnology, volume 6, number 6, pages 677-682, ISSN 1684-5315, 2007.
 
Development of microsatellite markers for anthracnose resistance in greater yam (Dioscorea alata L.) from expressed sequence tags of heterologous crop species, Narina, S. S., Montegue, P., Asiedu, R. and Mohamed, A. I., in: Journal of Root Crops, volume 38, number 1, pages 64-69, ISSN 0378-2409, 2012.
 
Diallel analysis of cassava genotypes to anthracnose disease, Owolade, F., Dixon, A. and Adeoti, A.*, in: World Journal of Agricultural Sciences, volume 2, number 1, pages 98-104, 2006.
 
Distribution and severity of Yam anthracnose in Nigeria, Akem, C. and Asiedu, R., in: Root Crops for food security in Africa: proceedings of the Fifth Triennial Symposium of the International Society for Tropical Root Crops-Africa Branch, 22-28 November 1992, Kampala, Uganda, pages 297-301, ISTRC-AB; CTA; International Institute of Tropical Agriculture (IITA), 1994.
 
Distribution of yam anthracnose disease in Nigeria, Aduramigba-Modupe, A. O.*, Odebode, C. A.* and Asiedu, R., in: African Journal of Root and Tuber Crops, volume 8, number 1, pages 51-55, ISSN 1118-2075, 2010.
 
Effect of planting season on cassava anthracnose disease development, Fokunang, C.*, Akem, C., Ikotun, T.* and Dixon, A., in: Crop Protection, volume 18, number 6, pages 407-413, ISSN 0261-2194, 1999.
 
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.
 
Estimate App for yam anthracnose disease phenotyping: user guide, Kolade, O. and Kumar, P. L., Booklet, 2021.
 
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.
 
Evidence for high evolutionary potential of Colletotrichum gloeosporioides, the causal agent of yam anthracnose disease, Abang, M., Asiedu, R., Hoffmann, P., Wolf, G., Mignouna, H. and Winter, S., 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.
 
Evidence for high evolutionary potential of Colletotrichum gloeosporioides, the causal agent of yam anthracnose disease, Abang, M., Asiedu, R., Hoffmann, P., Wolf, G., Mignouna, H. and Winter, S., in: Proceedings of 9th ISTRC-AB symposium, Mombasa, Kenya, pages 602-613, Mombasa, Kenya, 2007.
 
First report of anthracnose caused by Colletotrichum gloeosporioides on onion (Allium cepa) in Benin, Sikirou, R.*, Beed, F., Hotegni-Houessou, J., Winter, S., Assogba-Komlan , F.*, Reeder, R. and Miller, S. A., in: New Disease Reports, volume 23, pages 7, ISSN 2044-0588, 2011. [DOI]
 
First report of Colletotrichum cliviicola causing anthracnose disease of cowpea (Vigna unguiculata L. Walp) in Nigeria, Dada, A. O., Dania, V. O.*, Oyatomi, O., Abberton, M. and Ortega-Beltran, A., in: Plant Disease, volume 107, number 7, pages 1, ISSN 0191-2917, 2023. [DOI]
 
Gene/QTL discovery for Anthracnose in common bean (Phaseolus vulgaris L.) from north-western Himalayas, Choudhary, N.*, Bawa, V.*, Paliwal, R., Singh, B.*, Bhat, M. A.*, Mir, J. I.*, Gupta, M.*, Sofi, P. A.*, Thudi, M., Varshney, R. K. and Mir, R. R.*, in: PLoS ONE, volume 13, number 2(e0191700), pages 1-12, ISSN 1932-6203, 2018. [DOI]
 
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]
 
In vitro, greenhouse, and field assessment of cassava lines for resistance to anthracnose disease caused by colletotrichum gloeosporiodes f. sp. Manihotis, Fokunang, C. N., Ikotun, T.*, Asiedu, R., Tembe, E. A. and Akem, C., in: Mycopathologia, volume 154, number 4, pages 191-198, ISSN 0301-486X, 2002. [DOI]
 
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.
 
Molecular characterization of Colletotrichium gloeosporioides responsible for anthracnose of yam and cassava in Nigeria, and development of diagnostic PCR assay, Sharma, K., Ayodele, M., Bandyopadhyay, R., Asiedu, R. and Kumar, P. L., International Society for Tropical Root Crops (ISTRC), 2009.
 
Molecular identification of Colletotrichum gloeosporioides causing yam anthracnose in Nigeria, Abang, M., Winter, S., Green, K., Hoffmann, P., Mignouna, H. and Wolf, G., in: Plant Pathology, volume 51, number 1, pages 63-71, ISSN 0032-0862, 2002.
 
Molecular taxonomic, epidemiological and population genetic approaches to understanding yam anthracnose disease, Abang, M., Winter, S., Mignouna, H., Green, K. and Asiedu, R., in: African Journal of Biotechnology, volume 2, number 12, pages 486-496, ISSN 1684-5315, 2003.
 
Ontogenetic characteristics and inheritance of resistance to leaf anthracnose in sorghum, Tenkouano, A., Miller, F. R., Fredericksen, R. A. and Nicholson, R. L., in: African Crop Science Journal, volume 6, number 3, pages 249-258, ISSN 1021-9730, 1998.
 
Pattern analysis of sorghum genotype x environment interaction for leaf, panicle, and grain anthracnose in Mali, Hess, D. E.*, Bandyopadhyay, R. and Sissoko, I., in: Plant Disease, volume 86, pages 1374-1382, 2002.
 
Prevalence and severity of bacterial blight and anthracnose diseases of cassava in different agro-ecological zones of Nigeria, Onyeka, T., Owolade, F., Ogunjobi, A.*, Dixon, A., Okechukwu, R., Bandyopadhyay, R. and Bamkefa, B., in: African Journal of Agricultural Research, volume 3, number 4, pages 297-304, ISSN 1991-637X, 2008.
 
Quantitative methods for assessing the severity of anthracnose on yam (Dioscorea alata), Simons, S. A. and Green, K., in: Tropical Science, volume 34, pages 216-224, ISSN 0041-3291, 1994.
 
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.
 
Reactions of sorghum genotypes to leaf, panicle and grain anthracnose under field conditions in Mali, Hess, D. E.*, Bandyopadhyay, R. and Sissoko, I., in: Towards sustainable sorghum production, utilization, and commercialization in West and Central Africa: proceedings of a Technical Workshop of the West and Central Africa Sorghum Research Network, 19â??22 April 1999, Lome, Togo, pages 163-177, International Crops Research Institute for the Semi Arid Tropics, Patancheru 502 324, Andhra Pradesh, India, 2001.
 
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.
 
Role of insect vector Pseudotheraptus devastans in cassava anthracnose disease development, Fokunang, C.*, Akem, C., Ikotun, T.*, Dixon, A. and Tembe, E.*, in: European Journal of Plant Pathology, volume 106, pages 319-327, 2000.
 
Screening cassava cultivars for resistance to the cassava anthracnose disease (CAD), Ikotun, T.* and Hahn, S. K., in: Tropical root crops in a developing economy: proceedings of the 9th Symposium of the International Society for Tropical Root Crops, 20-26 October 1991, Accra, Ghana, pages 178-183, ISTRC; Government of Ghana; International Institue of Tropical Agriculture (IITA), 1994.
 
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.
 
Seed survival and transmission of cassava anthracnose disease and seed treatment effect on seedling growth, Fokunang, C.*, Akem, C., Ikotun, T.* and Dixon, A., in: Pakistan Journal of Biological Science, volume 2, pages 849-854, 1999.
 
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.
 
Sources of resistance to cassava anthracnose disease, Owolade, F., Dixon, A., Adeoti, A.* and Osunlaja *, S., in: African Journal of Biotechnology, volume 4, number 6, pages 570-572, ISSN 1684-5315, 2005.
 
Strategies to combat the problem of yam anthracnose disease: status and prospects, Ntui, V. O., Uyoh, E. A.*, Ita, E. E.*, Markson, A. A. A.*, Tripathi, J., Okon, N. I.*, Akpan, M. O.*, Phillip, J. O.*, Brisibe, E. A.*, Tripathi, L. and Ene-Obong, E. O. E.*, in: Molecular Plant Pathology, volume 22, number 10, pages 1302-1314, ISSN 1464-6722, 2021. [DOI]
 
Studies of colletotrichum species causing cowpea anthracnose in Nigeria reveal two first-time reports globally, Dada, A. O., Dania, V. O.*, Oyatomi, O., Abberton, M. and Ortega-Beltran, A., in: Journal of Plant Pathology, pages 1-10, ISSN 1125-4653, 2024. [DOI]
 
Synergistic relationship of bacterial blight and anthracnose disease pathogen in cassava multiple infection, Fokunang, C.*, Ikotun, T.* and Dixon, A., in: Online Journal of Biological Science, volume 3, pages 596-606, 2003.
 
The influence of host genotype X environment interactions on the response of cassava anthracnose disease in diverse agro-ecologies in Nigeria, Ngeve, J., Dixon, A. and Nukenine, E., in: African Crop Science Journal, volume 13, number 1, pages 1-11, 2005.
 
The status of cassava mosaic disease, bacterial blight and anthracnose as constraints to cassava production in South Cameroon, Mwangi, M., Nolte, C. and Bandyopadhyay, R., in: Book of Abstracts of the 9th Triennial Symposium of the International Society for Tropical Root Crops-Africa Branch, 31 October-5 November 2004, Mombasa, Kenya., 2004.
 
The status of cassava mosaic disease, bacterial blight and anthracnose as constraints to cassava production in the Pouma region of south Cameroon, Mwangi, M., Bandyopadhyay, R. and Nolte, C., in: Proceedings of 9th ISTRC-AB symposium, pages 587-592, Mombasa, Kenya, 2007.
 
Yam anthracnose disease: field symptoms and laboratory diagnostics, Ayodele, M., Hughes, J. and Asiedu, R., in: Proccedings of the 9th ISTRC-AB symposium, Mombasa, Kenya, 2007.
 
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

Prevalence and severity of bacterial blight and anthracnose diseases of cassava in different agro-ecological zones of Nigeria, Onyeka, T., Owolade, F., Ogunjobi, A.*, Dixon, A., Okechukwu, R., Bandyopadhyay, R. and Bamkefa, B., in: African Journal of Agricultural Research, volume 3, number 4, pages 297-304, ISSN 1991-637X, 2008.
 
Keywords:anthracnose, bacterial blight, cassava, Colletotrichum gloeosporioides prevalence, severity, Xanthomonas axonopodis

Secondary metabolite profile and phytotoxic activity of genetically distinct forms of Colletotrichum gloeosporioides from yam (Dioscorea spp.), Abang, M., Abraham, W., Asiedu, R., Hoffmann, P., Wolf, G. and Winter, S., in: Mychological Research, volume 113, pages 130-140, ISSN 0953-7562, 2009.
 
Keywords:Anthracnose; chemotype; chromatography; colletotrichum gloeosporioides; Dioscorea spp.; mass spectrometry; metabolite profiling; NMR; phytotoxin

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.

Genetic gains from 30 years of cassava breeding in Nigeria for storage root yield and disease resistance in elite cassava genotypes, Okechukwu, R. and Dixon, A., in: Journal of Crop Improvement, volume 22, number 2, pages 181-208, 2008.
 
Abstract:
Cassava (Manihot esculenta Crantz) is crucial for both food security and poverty alleviation in Sub-Saharan Africa (SSA). Cassava improvement for SSA started at the International Institute of Tropical Agriculture in 1970, and several improved lines with different characteristics have been developed to date. The primary focus of breeding work has been to increase root yield, early bulking, tolerance to biotic and abiotic stresses, and increased dry matter content. This paper represents a study of 112 varieties cloned and introduced between 1970 and 2000, and evaluated in 2003 and 2004 to quantify genetic gains in root yield and disease resistance. The genetic gain per year was 1.3% for fresh root yield, 1.2% for dry root yield, 0.65% for cassava mosaic disease resistance, 0.21% for cassava anthracnose disease resistance, and -0.03% for cassava bacterial blight disease resistance. Though there was no statistical significance in the net negative genetic gain in cassava bacterial blight resistance, it is essential that more emphasis be placed on improving this trait to enhance stability and productivity in African environments.

Screening landraces for additional sources of field resistance to Cassava Mosaic Disease and green mite for integration into the Cassava Improvement Program, Raji, A., Ladeinde, O.* and Dixon, A., in: Journal of Integrative Plant Biology, volume 50, number 3, pages 311-318, 2008.
 
Abstract:
Twelve cassava landraces were evaluated for sources of resistance genes to diseases and pests of major economic importance in Africa. The objective was to assess their levels of field resistance to mosaic disease (ACMD), bacterial blight (CBB), anthracnose (CAD), and green mite (CGM), compared to TMS30572, an elite cultivar widely adopted in Africa. Considerable genotypic variation was observed among cultivars for resistance to ACMD and CGM but not for CBB and CAD. The lowest mean incidence of 12% and severity of 1.8 on a scale of 1-5 for ACMD was recorded for Atu, a landrace with farmer acceptable qualities. In comparison, the improved cultivar, TMS 30572, had a mean disease incidence of 72% and a severity score of 2.8. Another landrace, MS-20 had the lowest CGM damage score (2.1) while TMS 30572 emerged as one of the susceptible cultivars with a damage score of 3. Additional sources of resistance to ACMD and CGM that may possibly be better than the popular improved cultivar, TMS 30572, were identified in this study. These could serve as novel sources of additional genes to complement existing resources for elite cassava breeding in Africa.

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.
 
Abstract:
Anthracnose and virus diseases exert devastating impacts on yam production in many tropical regions of the world where the crop contributes to food security and income generation. The complexities in their epidemiology necessitate the use of integrated approaches in their management. Six genotypes of Dioscorea alata, planted on six dates (March?August) in each of 1998 and 1999 in Ibadan, Nigeria, were evaluated to determine the effects of planting date and genotype on severity of the two diseases. The date of planting had a profound influence on anthracnose severity, contributing 72% of the observed variation due to combined effects of planting date, genotype and their interactions. In contrast, the genotype effect was most dominant with respect to virus severity, accounting for 85% of the total observed variation. Planting in August supported least anthracnose development while April and May plantings resulted in the least severity of virus diseases. While selection of planting time could be used to manage anthracnose disease, its application could be influenced by the prevailing weather conditions in a particular location. Two of the genotypes (TDa 291 and TDa 297) had low severity values for both diseases across the different planting dates. Availability of such sources of multiple disease resistance and appropriate choice of planting date would be very useful in integrated management of the two major yam diseases.