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Prof. Ephraim Onoku Osai


Crop Science




[email protected]

About Prof. Ephraim Onoku Osai

Prof. Ephraim Onoku Osai holds a B.Sc (Hon) Degree in Botany from University Calabar, M.Sc in Agricultural Biology and Ph.D with specialisation in Plant Pathology from University of Ibadan. He has taught and supervise undergraduate and postgraduate student including three Masters and three Doctorate students. His research interest covers Ecology, Etiology, Development and Management Fungi Diseases in major food and cash crops and has made breakthroughs in the use of ashes from agricultural wastes in plant disease management. He has also recorded success with the field application of plant extract in disease control. A recipient of University of Calabar senate grant and Tertiary Education Trust Fund (TETFUND) Institutional research and conference grant, this current research are; on post-harvest diseases of tropical fruits, nutritional changes coursed of pathogens and their control true eco-friendly alternatives; and constraints to economic production of plantain in Cross River State. Prof. Osai belong to several professional bodies including Nigerian Society for plant protection Bio-pesticides society of Nigeria, Mycological society of Nigeria and organic agriculture project in lechery institutions in Nigeria. He has participated in local and international conferences and was a member of the local organizing committee for the 12th annual conference of the Mycological Society of Nigeria (Calabar 2012) and the 1st and 2nd annual conferences of Bio Pesticides Society of Nigeria (Calabar 2014-2015). Prof. E.O. Osai was the founding secretary to the Editorial Board of the Faculty of Agriculture based Journal of Agriculture, Forestry and Environment and a Reviewer with Global Journal of Science, Global Journal of Agriculture, Bios’ Pesticides Journals, Journal of Agriculture food and Environment etc. He has served as External Examiner (LSc) to the University of Uyo and a two time head of department of Crop Science, University of Calabar, Calabar. He has been a Sub-Dean of the faculty of Agriculture, Chairman of Departmental and Faculty Graduate committees as well as Chairman of Departmental Quality Assurance and Examination Ethics among other position.

S/N Qualification School Atttended Started Finished

S/N Publication
OSAI, E. O., UDO, S. E., OKOLI, C. E. & BEMOH, B. E. (2017). Comparative efficacy of three plant extracts for the control of leaf spot disease in fluted pumpkin (Telfairia occidentalis Hook F.). Journal of Biology, Agriculture and Healthcare (JBAH), 7 (12),56 - 62.
OSAI, E. O., AKAN, S. O. & UDO, S.E. (2017). Fungi-toxic Effect of Kola husk and Plantain Fruit stalk on the Growth of Three Leaf Spot Pathogens of Telfairia occidentalis (Hook F) in vitro. Journal of Bio-pesticides and Environment,4 (2),1 - 8.
EFFA, E. B., NWAGWU, F. A., OSAI, E. O. & SHIYAM, J. O. (2016). Growth and yield response of Bambara groundnut (Vigna subterranean (L.) Verdc) to varying densities and Phosphate fertilizer rates in Calabar, South Eastern Nigeria. Journal of Biology, Agriculture and Healthcare (JBAH), 6 (16),14 - 20.
OSAI, E. O., AKAN, S. O. & UDO, S. E. (2016). Kola pod husk ash suppresses the development of leaf spot disease in fluted pumpkin (Telfairia occidentalis Hook F). Journal of Bio pesticides and Agriculture Nigeria, 3 (1),66 - 73.
NWAGWU, F. A., EFFA, E. B. & OSAI, E. O. (2015). Weed flora dynamics and maize yield under different fertilizer types and spacing regimes. International Journal of Development and Sustainability(ISDS), 4 (12),1116 - 1125.
OKWECHE, S. I., OSAI, E. O. & UMOETOK, S. B. (2015). Maize borer damage in Nigeria’s Guinea Savanna: Timing of planting overrides effects of insecticides treatment. Revista Colombiana de Entomologia, 41 (2),170 - 175.
UDO, I. A., OSAI, E. O. & UKEH, D. A. (2014). Management of Root-Knot Disease on Tomatoes with Bioformulated Paecilimylsis lilacinus and Leaf Extract of Lantana camara. Brazilian Archieves of Biology and Technology, 57 (4), 488 – 492.
OKWECHE, S. I., UMOETOK, S. B. & OSAI, E. O. (2013). Effect of Synthetic (Carbofuran) and non-synthetic insecticides on Maize Growth and Yield in stem Borers infected zones of Cross River State, Nigeria. Journal of Biology, Agriculture and Healthcare, 3 (1),58 – 67.
OSAI, E. O., AKAN, S. O. & UDO, S. E. (2013). The Efficiency of Plantain Inflorescence Ash in the Control of Translucent Leaf spot Disease of Telfairia occidentalis (Hook F). International Journal of Research in Applied, Natural and Social Sciences (IJRANSS), 1 (1),37 - 44.
UDO, S. E, OSAI, E. O., OKOI, A. I, & ETTA, H. (2013). Assessment of yield loss in fluted pumpkin infected by Colletotrichum, lindemuthianum. International Journal of Applied and Natural Sciences (IJANS), 2 (5),77 - 84.
UDO, S. E., OSAI, E. O., UMANA, E. J, MARKON, A. A. & MADUNAGU, B. C. (2013). Infection related changes in Nutritional contents of fluted pumpkin (Telfairia occidentalis) infected by Diplocassum spicatum and control using plant extracts. International Journal of Research in Applied, Natural and Social Sciences (IJRANSS), 1 (1),29 - 36.
IWO, G. A., ITTAH, M. A. & OSAI, E. O. (2012). Sources and Genetics of Resistance to soybean Rust Phakopsora pachyrhizi (H. Synder) in Nigeria. Journal of Agricultural Science, 4 (10),1 - 6.
ITTAH, M. A., IWO, G. A., OSAI, E. O. & AKI, E. E.(2011). Response of soybean Genotypes to soybean Rust (Phakopsora pachyrhizi (Sydow-) infection in Nigeria. Journal of Agriculture, Britichnology and Ecology, 4 (3),54 - 69.
UDOH, S. E., OSAI, E. O., OKOI, A. I., OROK, E. E., TAKON, I. & ANDETTA, H. E. (2010). Control of Choanephora cucurbitarium induced fungal rot in cucumber (Cucumis sativus) using plant extracts. Nigeria Journal of Mycology, 3 (1),126 - 134.
OSAI, E. O. (2009). Comparative efficiency of plant ashes for the control of Sclerotium rot in Yam minisetts. African Journal of Environmental Pollution and Health, 7 (2),42 - 46.
UDO, S. E. , OSAI, E. O., ANDY, I., OROK, E. E., TAKON, T. & OMARA-ACHONG, T.(2009). Histopathological studies on Telfairia occidentalis leaf infected by Colletotrichum lindemuthianum. Journal of Agriculture, Forestry and the Social Sciences, 7 (1),191-198.
MADUNAGU, B. E.,UDO, S. E.,UMANA, E. J.,MARKSON, A. A.,OSAI, E. O. & BASSEY, I. (2008). Impact of rainfall on Colletotrichum leaf spot Infection of cucurbits in Cross River State, Nigeria. Journal of Agriculture, Forestry and the Social Sciences, 6 (2),116 - 124.
OSAI, E. O. & IKOTUN, T. (2000). Effect of Apron Plus on the growth of fungal Pathogens and rot suppress in Yam minisetts. Global Journal of Pure and Applied Science,6 (2),203 - 206.
OSAI, E.O., IKOTUN, T., ASIEDU, R. & HAHN, S. K. (1996). Susceptibility of Yam Cultivars to minisett rot pathogens. Trop.Sc., 36:201-205.
OSAI, E.O. & IKOTUN, T. (1993). Micro-organisms associated with cassava ministem rot. Int. J. Tropical Plant Disease, 11:161-166.

warning No Result For Grants Received.

S/N Conference Description Started Finished
Fourth International Conference on Plant Protection in the Tropics: Kuala Lumpur, Malaysia, 28-31 March 1994.Effects of inoculating yam minisetts with Pseudomonas fluorescens on rot incidence and sprouting in yam.1994-03-281994-03-31
Fifth Annual Conference of the Mycological Society of Nigeria. Calabar, 23 – 27 September, 2012. Fungi Discolouration of Cowpea seeds in Calabar, South Eastern Nigeria.2012-09-232012-09-27
First Annual Conference of Bio pesticides Society of Nigeria (BpSN). Calabar, 30thNov - 1stDec 2014.Antimycotic Activity of Aqueous and Oil Extracts of some Medicinal Plants against Sclerotium rolfsii (sacc) Curzi. in vitro.2014-11-302014-12-01
41st Annual Conference of Nigerian Society for Plant Protection (NNSPP) Zaria. 20th-24th March, 2016.Ethno-medicinal plant oil and water extracts as alternatives for the control of phytopathogenic fungi.2016-03-202016-03-24
12th National Conference on Organic Agriculture in Nigeria (OAPTIN) Kebbi. 13th-17th Nov, 2016. Comparative Efficacy of Three plant Extracts for the Control of Leaf Spot Disease in Fluted Pumpkin. (Telfairia occidentalis Hook F).2016-11-132016-11-17
3rd Annual Conference of Bio pesticides Society of Nigeria (BpSN). CRUTECH Calabar, 5th-8th Dec, 2016.Fungi-toxic Effect of Kola and Plantain Ash on the in vitro Growth of Three Leaf Spot Pathogens of Telfairia occidentalis (Hook F).2016-12-052016-12-08