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Dr. Etim Johnson Umana

Associate Professor
Botany
umanaej@unical.edu.ng

Synopsis

I am a Phytopathologist/Mycologist, currently involved in using botanicals in the control of plant diseases; also investigating the effects of mycotoxins in human beings and animals and how to control and reduce the effects in food and feed stuffs. I am a member of many learned academic Societies which include Nigerian Society for Plant Protection (NSPP), Botanical Society of Nigeria (BOSON), Chemical Society of Nigeria(CNS), Biopesticides Society of Nigeria (BpSN), Nigerian Association of Petroleum Explorationist, Mycological Society of Nigeria. I have held many post of responsibilities, Sub-Dean, Faculty of Science, Remedial/Pre-degree Coordinator, Head, Department of Botany, University of Calabar, Pioneer Head, Department of Biological Sciences, Akwa Ibom State University, Secretary, Academic Brief committee, Akwa Ibom State University, Visiting Lecturer, Akwa Ibom State University, Chairman, Central time table committee, Akwa Ibom State University, Mkpat Enin, Akwa Ibom State.

Publications

Publications by Etim Johnson


Okey, Edward Ntui; Akwaji, Patrick Ishoro; Umana, Etim Johnson and Markson, Aniedi-Abasi Akpan (2015). In Vitro and In Vivo Biological evaluation of crude extracts of Discorea dumetorum and Psidium quajava leaves in the control of storage rot of Onion (Allium cepa L.) bulbs. International Journal of Pharmacology, Phytochemistry and Ethnomadicine 1, 81 - 92. 


Markson, A. A., Akwaji, P. I. and Umana, E. J. (2017). Mushroom Biodiversity of CrossRiver State National Park (Oban Hills Division), Nigeria, World Scientific News, 65:59 - 80. Abstracted and Indexed in: Google Scholar, Corpernicus, cited factor.


Akwaji, Patrick Ishoro, Okon, Ekeng Ita, Umana, Etim Johnson and Markson, Aniedi-Abasi Akpan (2016). Phytochemical and Antifungal Efficacy of Leaf and Stem Bark Extracts of Parkia biglobosa on Fungi Association with Seed Rot of Green Bean


Umana, Etim Johnson, Akwaji, Patrick Ishoro and Markson, Aniedi-Abasi Akpan (2016). Bioremediation of Spent Engine Oil Contaminated Soil by Using Fungus, Penicllium sp. International Letters of Natural Sciences, 59:82 - 91. Abstracted and


Umana, Etim Johnson, Akwaji, Patrick Ishoro, Ekpenyong, Emmanuel Michael and Hanson, Penninah Imeh (2016). Control of Green Rot Fungus of Arachis hypogaea L. in storage using plant extracts. International Letters of Natural Sciences, 58: 77-84. Abstracted and Indexed in: Google Scholar, Corpernicus, Ulrichsweb.


Akwaji, P. I., Umana, E. J. and Okon, E. I. (2016). Phytochemical and Antifungal activity of Leaf extracts of Corchorus olitorius and Gongronema latifolium on Fungi Associated with Post-Harvest Deterioration on Maize (Zea mays) Seeds in Oban    Community, Nigeria. World Scientific News, 53(3):157 - 177.6. Okey, Edward Ntui, Akwaji, Patrick Ishoro, Akpan, Juliet Bassey, Umana, Etim Johnson and Bassey, Glory Akpan (2016). In vitro Control of Tomato (Solanum lycopersicum L.) fruit rot caused by fungi using two plant extracts. International Letters of Natural Sciences, 52:19 - 27.


Umana, E. J.; Akwaji, P. I.; Markson, A. A. and Udo, S. E. (2015). Gmelina arborea Roxb: Associated Mycoflora and Diseases in Cross River State, Nigeria. Global Journal of Science Frontier Research: C Biological Sciences 15(4 ver. 1.0) 1 -11. Abstracted and Indexed in: Google Scholar, Ulrichs, EBSCO.


E. J. Umana, S. E. Udo, A. A. Markson, E. N. Okey, N. A. Okon and E. M. Ekpenyong (2015). In-vitro effect of some commonly found botanicals on the growth and sporulation of Choanephora cucurbitarum (Berkeley and Ravenel). Journal of Biology, Agriculture and Healthcare, 5(11):111-119.Indexed in: EBSCO, Copernicus, Ulrich's Periodicals Directory, Journal TOCS, PKP Open, Archives Harvester, Bielefeld Academic Search Engine, Elektronische Zeitschriftenbibliothek EZB, Open J-Gate, OCLC WorldCat, Universe Digital Library, NewJour, Google Scholar (cited 1 times).


Edward Ntui Okey, Patrick Ishoro Akwaji, Etim Johnson Umana and Joy U. Omini (2015). Phytochemical screening and control of fungal diseases of Cocoa (Theobromae  cacao L.) pod using extracts of plant origin. Agricultural and Bionutritional Research 1(1), 20 - 27. Abstracted and Indexed in: Google Scholar, Corpernicus, Roi, DRJI.


Umana, E. J., Akwaji, P. A., Udo, S. E., Markson, A. A., Okey, E. N., Akpan, J. B.  and Effiong, P. F. (2014). Mycoflora associated with cocoa (Theobromae cacao) pods obtained in the field and their effects on seed nutritional contents. Journal of Agriculture and Crop Research, 2(12), 236 -241. Abstracted and Indexed in: Google Scholar, DRJI, J-Gate, Cited Factor.


Umana, E. J., Akwaji, P. I., Markson, A. A., Udo, S. E. and Orok, E. E. (2014). Phytochemical composition antimicrobial effect of Azadirchta indica and Carica papaya extracts on fungi isolated from Gmelina arborea seedlings. International Journal of Phytopathology, 3(3), 109 – 115. Abstracted and Indexed in: Cited Factor, Google Scholar, CAB (cited 1times).


Markson, A. A., Omosun, G., Umana, E. J., Madunagu, B. E., Amadioha, A. C. and Udo, S. E. (2014). Differential response of Solanum L and Ipomea batatas to three rot pathogens. International Research Journal of Natural Science, 2(1), 40 – 51. (Google Scholar, cited 1 time) Abstracted and Indexed in: Cabells directory, Ulrich, Open J. Gate, New Jour., ESCO Host, Proquest, DOAJ, Serials solutions, Index Copernicus, Scirus, Journal seek, University digital library.


Umana, E. J., Akwaji, P. I., Ekpenyong, E. M. and Okon, E. I. (2014). Suppression of Fusarium wilt of tomato by organic soil amendment. Journal of Life Sciences Research and Discovery 1, 5 – 9. Abstracted and Indexed in: Google scholar.


Umana, E. J., Akwaji, P. I., Ekpenyong, E. M., Okon, E. I. and Aruga, B. A. (2014). Effect of crude oil polluted soil in morphological growth of Phaseolus vulgaries (L). Journal of Life Sciences Research and Discovery 1, 14 – 18. Abstracted and Indexed in: Google scholar


Umana, E. J., Akwaji, P. I., Udo, S. E., Markson, A. A., Okey, E. N. and Udo, I. J. (2014). Determination of pathogenicity of Choanephora cucurbitarum (Berkeley and Ravenel) Thaxt, amongst commonly cultivated vegetables in Calabar, Cross River State, Nigeria. International Journal of Phytopathology, 3(2):55 – 61. (Cited 3times) Abstracted and Indexed in: CABI, Google scholar, Index Copernicus.


Udo, S. E., Osai, E. O., Umana, E. J., Markson, A. A. and Madunagu, B. E. (2013). Infection related changes in nutritional content fluted pumpkin (Telfaria occidentalis) infected by Diplocossum spicatum and control using plant extracts.  International Journal of Research in Applied and Natural Sciences (IJRANSS), 1 (1), 29 – 35. Abstracted and Indexed in:DOAJ, Scirus, Ulrich, Google Scholar, Index Copernicus, Serial solutions, Research Gate, Epernicus, Mendeley, New Jour, Scribd, get CITED.


Anwana, E. D., Umana, E. J. and Lennox, J. A. (2012) Antimircobial potential of ten medicinal plants used by the Bokis, Cross River State, Nigeria. Medicinal and AromaticPlants1:106:doi 10 .4172/2167-0412. 1000106. (Google Scholar, Scopus, cited 8 times) Abstracted and Indexed in: SCOPUS, DOAJ, EBSCO, Index Copernicus, Google scholar


Markson, A. A., Amodioha, A. C., Omosun G., Madunagu, B. E., Udo, S. E. and  Umana, E. J. (2012) . Control of Botryodiplodia theobromae causing tissues rot of white yam (Discoreae rotundata Poir). Scholarly Journal of Agricultural Science, 1: 1-7. (Google Scholar, cited 1 time) Abstracted and Indexed in: Google Scholar, Index Copernicus


Markson, A. A., Umana, E. J., Udo, S. E., Omosun, G., Madunagu, B. E. and  Osim, M. O. (2012) Tissue maceration and starch depletion caused by some rot pathogens of cassava (Manihot esculenta Cranz) International Journal of  Current Research4 (4) : 099-104 (ISSN : 0975-833X ). (Google Scholar, cited 1 time) Abstracted and Indexed in: Index Copernicus, DOAJ, Google scholar, DRJI, Scribd, Ulrichs, Journal seek.


Ebigwai, J. K., Edu, E. A., Umana, E. J. and Agaidaigho, A. (2012) In vivo evaluation of essential oil extract of six plants species and ivermectin on microfilaria of Simulium yahense. Journal of Natural Products and Plant Resources,2(2):306-309. Abstracted and Indexed in: Google scholar, ISA, Open J. Gate, Genamics, CABI, Index Copernicus, Hinari, EBSCO, Ulrich’s, SCIMAGO.


Udensi, O., E. J. Umana, E. A. B. Edu and E. V. Ikpeme (2011). Screening locally Pulses for proximate, anti-nutritive and mineral compositions. Indices for conservation and improvement. International Journal of Agricultural Research, 6(6):504-510. (Google Scholar, cited 3 times)Abstracted and Indexed in: Asci-database, CABI, Cambridge Scientific Abstract, Chemical Abstract Services, FSTA, Google Scholar, SCIMAGO, SCOPUS.


Udensi, O., E.A.B. Edu, E. J. Umana and E. V. Ikpeme (2011). Estimation of genetic variability in locally grown pulses (Cajans cajan) (L.) Millsp: and Vigna unguiculata (L.) Walp : A panacea for sourcing superior genotypes. Pakistan Journal of Biological Sciences. ISSN 1028-8880/DOI.3929/pjbs.2011:1-4. Abstracted and Indexed in: Asci-database, CABI, Cambridge Scientific Abstract, Chemical Abstract Services, FSTA, Google Scholar, SCIMAGO, SCOPUS, ISI web of Knowledge, Thomson ISI, DOAJ, Pubmed, AGRIS.


Udensi, O., Ikpeme, E. V., Markson, A. A., Madunagu, B. E. and Umana, E. J. (2011). Phytochemical markers of water samples treated with Moringa oleifera seed suspension. Research Journal of Agriculture and Biological Sciences, 7(2): 322 – 327. Abstracted and Indexed in: Google scholar.


Markson, A. A., Amadioha, A. C., Omosun, G., Ukeh, D., Udo, S. E., Umana, E. J. and Madunagu, B. E. (2011). Control efficiency of Botryodiplodia theobroma(PAT) by essential oil of Afromomum melengueta (K. Schum) seed from south south Nigeria. International Journal of Agricultural Research.  ISSN:  2006 – 1730: 88 – 92. (Google Scholar, cited 1 time)Abstracted and Indexed in: Asci-database, CABI, Cambridge Scientific Abstract, Chemical Abstract Services, FSTA, Google Scholar, SCIMAGO, SCOPUS.


Ekaluo, U. B., Ikpeme, V. E., Udensi, O. Markson, A.A., Madunagu, B. E.,Omosun, G. and Umana. E. J. (2010). Effect of aqueous leaf extract of Neem (Azadirachta indica) on the hormonal milieu of male rats International Journal of Current Research,4:001-003. (Google Scholar, cited 1 time) Abstracted and Indexed in: Index Copernicus, DOAJ, Google scholar, DRJI, Scribd, Ulrichs, Journal seek.


Udensi, O., Ikpeme, E. V., Markson, A. A., Edu, E. A. B., Umana, E. J. and Urua I. S. (2010) Selection of soybean genotypes using morphological markers. International Journal of Current Research, 7: 005-008. (Google Scholar, cited 7 times) Abstracted and Indexed in: Index Copernicus, DOAJ, Google scholar, DRJI, Scribd, Ulrichs, Journal seek.


Udo, S. E., Akwaji, P. I., Markson, A. A., Umana, E. J., Okey, E. N. and Asuquo, M. (2016). Parkia biglobosa Jacq (dawa-dawa): The threatened giant of the Guinea savanna of Nigeria (The Cross River State situation). Global Journal of Science Frontier Research, 16 (2 ver. 1.0).


Markson, A. A.; Umana, E. J.; Udo, S. E. and Akwaji, P. I. (2016). Chemical Pesticides: are they really necessary? Nigerian Journal of Biopesticides, 1:(1) 109 - 143.


Umana, E. J.; Markson, A. A.; Udo, S. E.; Okon, E. I. and Akwaji, P. I. (2016). Control of Post-Harvest Rot of Sweat Orange (Citrus sinensis) with Extracts of Plant Origin. Nigerian Journal of Biopesticides 1(1) 88 - 93.


Udo, S. E., Umana, E. J., Markson, A. A. and Okey, E. N. (2016). Control of Maize and Bean Weevils in Storage with Commonly Consumed Spices. Journal of Biopesticides and Agriculture. 3(1) 25 - 29.


Umana. E. J.; Akwaji, P. I.; Markson, A, A. and Udo, S. E. (2015). Phytochemical Constituents and In vitro Inhibitory Effect of ten Plant Extracts on Fungi associated with Gmelina arborea Roxb in Cross River State Nigeria. Journal of Biopesticides and Environment. 1:63 - 73.


Edelduok, E. G. and Umana, E. J. (2015). Nematodes as biocontrol agents of insect pests of plant. Journal of Biopesticides and Environment 1:80 - 88.


Andy, I. E.; Edu, G. S.; Bassey, I. U.; Markson, A. A.; Umana, E. J. and Udo, S. E. (2015). Biodegradation of paraquat. Journal of Biopesticides and Environment. 1:74 79.


Markson, A. A., Omosun, G., Madunagu, B. E., Amadioha, A. C., Udo, S. E., Umana, E. J. and Ekaluo, U. (2010). Growth response of Botryodiplodia theobromae to some environmental factors and its implication on yam storage.  International Journal of Natural and Applied Science, 5 (1 & 2): 11 – 15. Abstracted and Indexed in: DOAJ, Scirus, Ulrich, Google Scholar, Index Copernicus, Serial solutions, Research Gate, Epernicus, Mendeley, New Jour, Scribd, getCITED.


Umana, E. J.,Udo, S. E., Markson, A. A., Madunagu, B. E. and Omokaro, D. N. (2009). Influence of age and pH on the activity of pectinase in Fusarium induced Gmelina seedling rot. Nigerian Journal of Mycology,2(1): 198-208.Abstracted and Indexed in: African Journals Online (AJOL)


Madunagu, B. E., Udo, S. E., Umana, E. J., Markson A. A. and Bassey, I. (2007). Impact of rainfall on Colletotrichum leaf spot infection of cucurbits in Cross River State. Nigeria. Journal of, Agriculture Forestry and Social Sciences. 6(2) :116-124. Abstracted and Indexed in: African Journals Online (AJOL)


Madunagu, B. E., Udo, S. E., Umana, E. J. and Markson, A. A. (2007). Effect of Colletotichum leaf spot disease on growth parameters of Colocynthis citrillus and Cucurbita pepo. International Journal of Natural and Applied Sciences, 2(2):40-44. Abstracted and Indexed in: DOAJ, Scirus, Ulrich, Google Scholar, Index Copernicus, Serial solutions, Research Gate, Epernicus, Mendeley, New Jour, Scribd, getCITED


Umana, E. J.; Madunagu, B. E., Udo, S. E. and Markson, A. A. (2007). Time course of production of pectolytic enzymes by pathotypes of Choanephora cucurbitarum. International Journal of Natural and Applied Sciences 2(1): 49-52. Abstracted and Indexed in: DOAJ, Scirus, Ulrich, Google Scholar, Index Copernicus, Serial solutions, Research Gate, Epernicus, Mendeley, New Jour, Scribd, getCITED.


Udo, S.E., Madunagu, B. E.,Umana, E. J. Markson, A. A. and Obi-Abang, M. (2007). Biochemical alteration on Colletotrichum lindemuthianum-infected pumpkin (Cucurbita pepo). Journal of Agriculture, Forestry and Social Sciences (JAOFSS), 5(1): 120-125.   (Google Scholar, cited 2 times)  Abstracted and Indexed in: African Journals Online (AJOL)


Udo, S.E, Madunagu B. E., Umana, E. J., Markson, A. A. and Takon, I. (2006).The efficacy of extracts from four oil seeds and oil fruit as agents against pathogenic microbes in comparison with known antibiotics. Journal of Agriculture, Forestry and Social Sciences (JAOFSS), 4(2):119-125. (Cited 1 times) Abstracted and Indexed in: African Journals Online (AJOL)


Madunagu B. E., Udo, S.E, Umana, E. J., and Markson, A. A. (2005). Exploitation of Phanerogamic parasites and epiphytic plants for their medicinal value. Nigerian Journal of Plant Protection, 22: 17 – 23. (Google Scholar, cited 21 times). Abstracted and Indexed in: African Journals Online (AJOL)


Markson, A. A., Madunagu, B. E., Umana, E. J. Udo, S. E. (2005). A Survey and biocontrol of the post- harvest fruit rotting fungi of tomato. Nigerian Journal of Plant Protection 22: 122-131.  (Google Scholar, cited 38 times) Abstracted and Indexed in: African Journals Online (AJOL)


Umana, E. J., and Ikotun, T. (2000) Effect of pH on enzyme productivity by three pathotypes of Choanephora cucurbitarum. Global Journal of Pure and Applied Sciences 6(3) :413 – 416. Abstracted and Indexed in:         African Journals Online (AJOL)

Reseacrh Works Done

No Results for Research Works done

Conferences Attended

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Grants Received

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