Prof. Raphael Nnajiofor Okigbo

Prof. Raphael Nnajiofor Okigbo is a PROFESSOR in BOTANY Department, Faculty Of Bio-sciences in Nnamdi Azikiwe University

Prof. Raphael Nnajiofor Okigbo

Staff Profile

PROFESSOR RAPHAEL NNAJIOFOR OKIGBO, FMYCOSON, FAATSEA Department of Botany, Nnamdi Azikiwe University (UNIZIK) PMB 5025, Awka, Anambra State, Nigeria Phone: +234-8052239358 | Email: [email protected], [email protected] Google Scholar: 4,313 Citations | H-Index: 31 | i10-Index: 59 EXECUTIVE SUMMARY Distinguished Professor of Botany and Plant Microbiology with over 18 years of full professorial rank (promoted October 2008) and 38+ years of university teaching, research, and high-level administrative leadership. Demonstrated strategic governance through roles as Acting Dean, Head of Department, Senate Committee Chairman, and leadership across national university bodies. Proven track record in institutional development, research grant attraction, curriculum review for the National Universities Commission (NUC), and international academic collaborations. He has 4,313 Citations, H-Index: 31 and i10-Index: 59 EDUCATION & ACADEMIC QUALIFICATIONS • Ph.D. in Microbiology – University of Benin, Nigeria (1995) • Postgraduate Diploma in Education (PGDE) – Usmanu Danfodiyo University, Sokoto (2010) • M.Sc. in Microbiology – University of Benin, Nigeria (1992) • M.Sc. in Botany – University of Benin, Nigeria (1988) • B.Sc. in Botany – University of Benin, Nigeria (1984) UNIVERSITY ADMINISTRATIVE & GOVERNANCE LEADERSHIP • Chairman, VC Senate Committee on Staff Welfare/Club Services, UNIZIK (2024–2026) • Applied & Interviewed for Vice Chancellor Positions: o Michael Okpara University of Agriculture, Umudike (Feb 2026) o Federal University of Petroleum Resources Effurun (March 2025) • Acting Dean, Faculty of Biosciences, UNIZIK (2013) • Pioneer Sub-Dean, Faculty of Biosciences, UNIZIK (2010–2013) • Head of Department, Department of Botany, UNIZIK (2006–2007; 2011–2012) • Chairman, Senate Committee on Arboreal & Environmental Protection, UNIZIK (2012–2015) • Pioneer Chairman, Faculty of Biosciences Welfare Committee, UNIZIK (2010–2014) • Faculty Representative in Senate, MOUAU (2004–2005) ACADEMIC & PROFESSIONAL APPOINTMENTS • Professor, Dept. of Botany, Nnamdi Azikiwe University, Awka (2008–Present) • Sabbatical Professor, Delta State University (2021–2023) & Univ. of Uyo (2014–2015) • Adjunct Professor, Dept. of Science Education, ESCET (2013–2014) • Reader, Dept. of Botany, Nnamdi Azikiwe University, Awka (2005–2008) • Senior Lecturer / Lecturer I, Michael Okpara Univ. of Agriculture, Umudike (1999–2005) • Lecturer I / II / Assistant Lecturer, Delta State University, Abraka (1992–1999) FELLOWSHIPS, HONORS & SCHOLARLY RANKINGS • Ranked #3 Scholar in UNIZIK out of Top 100 Scholars by citations and publications (2020/2021 VC Commendation). • AD Scientific Index (2023): Ranked #4 in UNIZIK, #121 in Nigeria. • Fellow, Mycological Society of Nigeria (FMYCOSON, 2017). • Fellow, Association of Agricultural Technology in South-East Asia (FAATSEA, 2015). • Major Donor / 15-Star Paul Harris Fellow (PHF+14), Rotary International (2019/2025). • Special Commendation Award for Research, Emerald Group Publishing, UK/USA (2009). NATIONAL & INTERNATIONAL CONTRIBUTIONS • President, Mycological Society of Nigeria (MYCOSON) (2025–Present) • NUC Resource Person: Comprehensive review of Core Curriculum and Minimum Academic Standards (CCMAS) for Botany programmes in Nigerian Universities (2021). • NUC Accreditation Team Member: Kano State Univ. of Science & Tech. and Fed. Univ. Dutse (2021). • Electoral Returning Officer: Federal Constituencies & Gubernatorial Elections (2015, 2019). • Editor-in-Chief, Journal of Phytopathology and Plant Health. • External Examiner & Professorial Assessor: Evaluated senior academic staff for over 15 institutions including Univ. of Nigeria Nsukka, Univ. of Benin, Univ. of Uyo, and Madurai Kamaraj Univ. (India). SELECTED RESEARCH GRANTS ATTRACTED • TETFund Research Grants: Multiple grants awarded for biofertilizer development, mushroom production, and livestock biogas systems (2012–2013). • Emerald Research Fund Award (UK): Facilitating Knowledge Creation & Transmission in Sub-Saharan Africa (£6,000). • International Travel & Conference Grants: CTA Netherlands ($3,000), AATSEA Philippines ($2,000), Chinese Local Govt. Grants, and TETFund Travel Grants (2005–2019). POSTGRADUATE SUPERVISION & PUBLICATIONS • Ph.D. Dissertations Supervised: 10+ completed doctoral candidates. • M.Sc. Theses Supervised: 16+ completed master's candidates. • Publications: Over 132 peer-reviewed journal articles, 5 book/proceeding chapters, and 14 international keynote/abstract presentations across Europe, Asia, and North America. REFEREES 1. Chinenye Gloria Okeke Registrar and Secretary to Council, Nnamdi Azikiwe University, Awka, Nigeria. Phone: +234-7069281882 2. Prof. Michael U. Orji Vice Chancellor, Caritas University, Emene, Enugu State, Nigeria. Phone: +234-8034539692 3. Prof. A. I. Izundu Department of Botany, Nnamdi Azikiwe University, Awka, Nigeria. Phone: +234-7036643123

Personal Information

Email:
Phone:
Address:
Botany, Faculty Of Bio-sciences, Nnamdi Azikiwe University, Awka.
Faculty/Unit:
FACULTY OF BIO-SCIENCES
Department/Sub-Unit:
BOTANY

Creative Output

Books
1Raphael N Okigbo. (2016, October) HEALTHY PLANTS TODAY FOR HEALTHY MAN TOMORROW , Vol. 33, (Issue 1), pp 46
Book Chapters
1Raphael Nnajiofor Okigbo. (2021, April) The Role of Plant Scientists to Achieving SDG-2 and SDG-15 , Vol. 1, (Issue 1), pp 186
Journal Articles
1Chikaodili Eziamaka Afam-Ezeaku, Raphael Nnajiofor Okigbo. (2026, July), "Use of Bioprotective Potentials of Lactobacillus spp. for the Control of Post Harvest Rot of Sweet Potato (Ipomoea batatas (L.) Lam.)", Journal of Advances in Food Science and Technology, Vol. 13, (Issue 1), pp 21-33
2RN Okigbo, OC Igboanugo. (2025, July), "CULTIVATION OF OYSTER MUSHROOM (Pleurotus tuberegium) USING LOAMY SOIL, MANURE AND RICE HUSK SUBSTRATES.", Nigerian Journal of Mycology, Vol. 17, pp 100
3Afam-ezeaku C, Okigbo R N. (2025, January), "The role of digital technologies in advancing plant pathology in Africa", Asian Journal of Plant and Soil Sciences
4Afam-Ezeaku, C.E.; Okigbo, R.N. (2025, January), "The role of digital technologies in advancing plant pathology in Africa.", Unknown Journal or Publisher
5RO Ezebo, RN Okigbo. (2024, November), "Biological control of post-harvest rot in water yam (Dioscorea alata L.) using antagonistic fungi", International Journal of Pathogen Research, Vol. 13, pp 101-116
6RO Ezebo, RN Okigbo. (2024, November), "Ethno-Botanical Study of Water Yam (Dioscorea alata L.) Tubers in Storage in the South-Eastern Nigeria", Asian Journal of Food Research and Nutrition, Vol. 3, (Issue 4), pp 1113-1130
7CL Anuagasi, RN Okigbo. (2024, July), "Ethno-Botanical Uses and Socio-Cultural Importance of White Yam (Dioscorea rotundata Poir.) in South-Eastern, Nigeria", Asian Journal of Research in Botany, Vol. 7, (Issue 2)
8Chioma Lilian Anuagasi * and Raphael Nnajiofor Okigbo. (2024, July), "Ethno-Botanical Studies of Post-harvest Rot of White Yam (Dioscorea rotundata Poir.) in the Five South-eastern States of Nigeria", GSC Advanced Research and Reviews, Vol. 24, (Issue 1), pp 439–455
9Muonyelu E. Nkemakonam*, Okigbo N. Raphael, and Iroka F. Chisom. (2024, August), "ISOLATION, IDENTIFICATION AND CROSS-INFECTION OF PATHOGENS RESPONSIBLE FOR POSTHARVEST SPOILAGE IN YAM AND COCOYAM ACROSS MARKETS IN AWKA, ANAMBRA STATE NIGERIA", African Journal of Agriculture and Food Science (AJAFS), Vol. 7, (Issue 3), pp 225-239
10Okafor Maryrose Chikaosolu, Okigbo Raphael Nnajiofor. (2024, June), "Evaluation of Three Organic Agricultural Wastes as Substrates for Cultivation of Mushroom (Pleurotus Tuberregium Fr.)", International Journal of Advanced Multidisciplinary Research and Studies, Vol. 4, (Issue 3), pp 1318-1324
11Uche, J. I., Okigbo, R. N., and Ezika, C. F. (2024, January), "Comparative Phytochemical Analyses of Aspilia africana (Pers) C.D. Adams, Chromolaena odorata (L) King and H.E. Robinson and Gongronema latifolium (Benth)", International Journal of Microbiology and Applied Sciences, Vol. 3, (Issue 1)
12RO Ezebo, RN Okigbo. (2024, November), "Biological control of post-harvest rot in water yam (Dioscorea alata L.) using antagonistic fungi", Int. J. Pathog. Res, Vol. 13, (Issue 6), pp 101- 116
13Odira Johnson Oledibe ,1 Ifeoma Bessie Enweani-Nwokelo , Raphael Nnajiofor Okigbo,1 and Adaeze Nnedinma Achugbu1. (2023, August), "Formulation of Fungal Media from Local Plant Materials", Advanced Gut & Microbiome Research
14Okigbo, R N and Uwah, C. C. (2022, January), "Evaluation of pest and diseases affecting cultivated mushroom in Awka, Anambra State, Nigeria", Advances in Nutrition & Food Science, Vol. 7, (Issue 1), pp 83-87.
15Okigbo, R. N., Okafor, S. P.. (2022, June), "Fungal flora of mechanic workshops and its bioremediation", International Journal of Agricultural Technology, Vol. 18, (Issue 2), pp 709-720
16RN Okigbo, CS Ugwu. (2021, November), "Neglected crops of Africa", Unknown Journal or Publisher
17RN Okigbo, N Muonyelu, A Egwu. (2021, July), "Effect of using rice husk for cultivation of Pleurotus tuberregium (Fr.) Singer", Journal of Basic and Applied Research International, Vol. 27, (Issue 5), pp 1-10
18RN Okigbo, CL Anuagasi. (2021, June), "Diseases affecting mushrooms in Africa", Journal of Food Technology and Nutrition Science, Vol. 129, pp 2-10
19R. N. Okigbo, R. O. Ezebo1,*, C. M. Nwatu1, J. N. Omumuabuike2 and G. B. Esimai2. (2021, July), "A Study on Cultivation of Indigenous Mushrooms in South Eastern Nigeria", World News of Natural Sciences, Vol. 34, pp 154-164
20RN Okigbo, CF Anyaegbu. (2021, August), "Underutilized plants of Africa", Unknown Journal or Publisher, Vol. 13, (Issue 2), pp 34 - 49
21Okigbo, R. N., 2Anyaegbu, C. F.* and 3Dalafi, T. P.. (2020, July), "Pollution from Spent Engine Oil with their Bioremediation Potentials In Auto-Mobile Workshops in Awka, Anambra State, South Eastern Nigeria", Nig J. Biomed Engrg, Vol. 13, pp 39 - 44
22Okigbo, R. N., Ezebo, R. O. and Okoli, S. I.. (2020, May), "Phytochemical analysis of Xylopia aethiopica (Dun), Citrus limon (L.) and Allium sativum (L.) extracts and their effect on selected human pathogens", Advancement in Medicinal Plant Research, Vol. 8, (Issue 2), pp 35-42,
23RN Okigbo, IA Nmeka. (2020, April), "Control of yam tuber rot with leaf extracts of Xylopia aethiopica and Zingiber officinale", Frontiers of Agriculture and Food Technology
24Okigbo, R. N., Chukwuma, N. G. (2019, December), "Growth Pattern and Pests of the Mushroom Pleurotus tuber-regium (Fr.) Singer Found in Awka, Nigeria", CPQ Nutrition,, Vol. 3, (Issue 6), pp 1- 10
25R. N. Okigbo, C. L. Anuagasi, C. N. Nnoli. (2019, July), "Ethnobotanical Uses of Medicinal Plants for the Control of Diabetes and Hypertension", Journal of Community and Preventive Medicine, Vol. 2, (Issue 1)
26RN Okigbo, JE Okigb. (2018, July), "Ethnostudy of mushrooms and establishment of pure culture of cantharellus species (Ero Umunwene) a newly discovered mushroom found in Ukwa-East, Abia State, Nigeria", International Journal of Agricultural Technology, Vol. 14, (Issue 4), pp 571-596
27Okigbo, R.N., Chukwuma, N.G, Ani, S.E. (2017, June), "FUNGITOXIC ATTRIBUTES OF CHROMOLAENA ODORATA AND MIMOSA PUDICA LEAF EXTRACTS ON THE PATHOGENS CAUSING YAM ROT", Nigerian Journal of Mycology, Vol. 9, (Issue 1), pp 94-104
28OKIGBO, R. N. ; *ANUAGASI, C. L. AND EZENWELU, C. L.. (2017, July), "CULTIVATION OF KING TUBER MUSHROOM USING CASSAVA ( ) PEELS, LOAMY SOIL AND THE COMBINATION OF CASSAVA PEELS AND LOAMY SOIL AS SUBSTRATES.", Nigerian Journal of Mycology, Vol. 9
29Okigbo, R.N., Anuagasi, C.L. Andezenne, A.. (2016, August), "ANTIMICROBIAL ACTIVITIES OF TELFAIRIA OCCIDENTALIS HOOK.F. AND ZINGIBER OFFICINALE ROSC. ON SOME CLINICAL ISOLATES.", Nigerian Journal of Mycology
30RN Okigbo, PU Opara, CL Anuagasi. (2015, August), "Efficacy of extracts of water yam (Dioscorea alata) and aerial yam (Dioscorea bulbifera) peels in the control of white yam (Dioscorea rotundata) rot.", Unknown Journal or Publisher
31Okigbo,R.N., Anuagasi,C.L. and Nwanna,C.R.. (2015, June), "CONTROL OF YAM ROT FUNGI WITH CRUDE EXTRACTS OF CHROMOLAENA ODORATAAND CYMPOBOGON CITRATUS.", Nigerian Journal of Mycology, Vol. 7, (Issue 1), pp 44-54
32Okigbo, R.N., Anukwuorji, C.A*.and Okafor, C.O.. (2015, August), "Assessment of mycotoxins occurrence inManihot esculenta, Irvingia gabonensis, Citrullus colocynthisin Awka, Anambra State", Mycotoxicology,, Vol. 2, pp 22- 27
33Raphael Nnajiofor Okigbo, Chijioke Maxwell Nwatu. (2015, January), "Ethnostudy and usage of edible and medicinal mushrooms in some parts of Anambra state, Nigeria", Natural resources, Vol. 6, (Issue 1), pp 79
34Okigbo R N, Anukwuorji, C A and Eguae C T. (2012, October), "CONTROL OF MICROORGANISMS CAUSING THE DETERIORATION OF YAM CHIPS WITH VERNONIA AMYGDALINA (L) AND ZINGIBER OFFICINALE (L).", Nigerian Journal of Mycology, Vol. 4, (Issue 1)
35E.C. Mmeka R.N. Okigbo. (2010, February), "Biological control of rot-inducing fungi of water yam (Dioscorea alata) with Trichoderma harzianum, Pseudomonas syringae and Pseudomonas chlororaphis", Unknown Journal or Publisher
36Raphael N Okigbo, Rachel E Okorie, Ramesh R Putheti. (2009, September), "In vitro effects of garlic (Allium sativum L.) and African basil (Ocimum gratissimum L.) on pathogens isolated from rotted cassava roots", Interciencia, Vol. 34, (Issue 10), pp 742-747
37RN Okigbo, CL Anuagasi, JE Amadi, UJ Ukpabi. (2009, September), "Potential inhibitory effects of some African tuberous plant extracts on Escherichia coli, Staphylococcus aureus and Candida albicans", Unknown Journal or Publisher, Vol. 6, (Issue 2), pp 34 - 491-96
38RN Okigbo, Ramesh Putheti, CT Achusi. (2009, March), "Post‐Harvest Deterioration of Cassava and its Control Using Extracts of Azadirachta Indica and Aframomum Melegueta", Journal of Chemistry, Vol. 6, (Issue 4), pp 1274-1280
39Raphael N Okigbo, CL Anuagasi, JE Amadi. (2009, February), "Advances in selected medicinal and aromatic plants indigenous to Africa", Journal of medicinal plants Research, Vol. 3
40RN Okigbo, EC MmekaAfrican Journal of Traditional, Complementary, and Alternative Medicines. (2008, April), "Antimicrobial effects of three tropical plant extracts on Staphylococcus aureus, Escherichia coli and Candida albicans", African Journal of Traditional, Complementary, and Alternative Medicines, Vol. 5, (Issue 3), pp 226
41RN Okigbo, UE Eme, S Ogbogu. (2008, December), "Biodiversity and conservation of medicinal and aromatic plants in Africa", Biotechnology and Molecular Biology Reviews, Vol. 3, (Issue 6), pp 127-134
42Ramesh Reddy Putheti, R N Okigbo, Madhusoodhan Sai advanapu and Sangeeta Chavanpatil. (2008, March), "Nanotechnology importance in the pharmaceutical industry", African Journal of Pure and Applied Chemistry, Vol. 2, (Issue 3), pp 027-031
43RN Okigbo, UO Ogbonnaya. (2006, May), "Antifungal effects of two tropical plant leaf extracts (Ocimum gratissimum and Aframomum melegueta) on postharvest yam (Dioscorea spp.) rot", African Journal of biotechnology, Vol. 5, (Issue 6)
44RN Okigbo, AN Ajalie. (2005, January), "Inhibition of some human pathogens with tropical plants extracts Chromolaena odorata and Citrus aurantifolia and some antibiotics.", Unknown Journal or Publisher, Vol. 1, (Issue 1), pp 34-40
45RN Okigbo. (2005, February), "Biological control of postharvest fungal rot of yam (Dioscorea spp.) withBacillus subtilis", Mycopathologia, Vol. 159, (Issue 2), pp 307
46RN Okigbo. (2004, September), "A review of biological control methods for post harvest yams (Dioscorea spp.) in storage in South Eastern Nigeria", Unknown Journal or Publisher, Vol. 4, (Issue 1), pp 207
47Raph N Okigbo, Maria I Osuinde. (2003, February), "Fungal leaf spot diseases of mango (Mangifera indica L.) in Southeastern Nigeria and biological control with Bacillus subtilis", Plant Protection Science, Vol. 39, (Issue 2), pp 70
48R. N. Okigbo. (2003, September), "Mycoflora of tuber surface of white yam (Dioscorea rotundata poir) and postharvest control of pathogens with Bacillus subtilis", Unknown Journal or Publisher, Vol. 156, (Issue 2)
49R N Okigbo. (2003, January), "Fungi associated with peels of post harvest yams (Dioscorea spp.) in storage", Global Journal of Pure and Applied Sciences, Vol. 8, (Issue 1), pp 19 - 24
50RN Okigbo, FEO Ikediugwu. (2001, July), "Biological control of tuber surface mycoflora of yams (Dioscorea rotundata).", Unknown Journal or Publisher, Vol. 41, (Issue 2), pp 85 - 89

Academic Leadership Qualities

Supervisions
1"(1) Ethnobotanical Studies of sweet potato ( Ipomea batatas) and biofungicidal potentials of Lactobacillus species for the control of the postharvest rot in Anambra State." (2026). Completed Doctorate project by Afam-Ezeaku Chikaodili C (NAU/PG/Ph.D./2020577001P)
2"(2) Ethno-botanical study of post-harvest rot of water yam (Dioscorea alata L.) and molecular characterization of biocontrol agents" (2025). Completed Doctorate project by Ezebo, R. O. (2025). NAU/PG/Ph.D./2018577005F
3"Taxonomic assessment of the diversity of tree and shrub species in three tropical forest sites in Aambra State, Nigeria" (2024). Completed Doctorate project by Iroka, Chisom F. (2024). NAU/PG/Ph.D./2019577007P
4"Fungicidal potentials of leaf and back extracts Bryophyllum pinnatum, Mimosa pudica and Hura crepitas on post-harvest cowpea (Vigna unguiculata) seed fungi" (2024). Completed Doctorate project by Oledibe, O. J., (2024). NAU/PG/Ph.D./2018577005F
5"(5) Ethno-botanical studies of white yam (Dioscorea rotundata Poir.) and molecular characterization of biocontrol agents" (2024). Completed Doctorate project by Anuagasi, C. L. (2024). NAU/PG/Ph.D./2018577004P
6"(6) Fungicidal potentials of Piper guineense seed, Gongronema latifolium leaf and Allium sativum rhizome extract on post-harvest rot of Colocasia esculenta." (2023). Completed Doctorate project by Ejimofor C. F. (2023). NAU/PG/Ph.D./2019577001FA.
7"(7) Assessment and aflatoxins contamination of some food materials sold in south eastern Nigerian markets" (2018). Completed Doctorate project by Anukwuorji CA, (2018). NAU/PG/Ph.D/2012577005P
8"(8) Effects of some ethno medicinal plant extracts on fungi associated with rot of yams (Dioscorea rotundata Poir)." (2018). Completed Doctorate project by Chikwendu, AE, (2018). NAU/PG/Ph.D 2012577005F
9"Taxonomic Studies of seven varieties of Vigna unguiculata (Cowpea) available plants in Awka, Anambra State, Nigeria" (2017). Completed Doctorate project by Azijekwe Bibian (2017
10"Taxonomic and socio-economic studies of some indigenous medicinal, aromatic and pesticidal (MAP) plants used in health care delivery in parts of Southern Nigeria." (2011). Completed Doctorate project by Chukwuma, I. W. (2011). PG/Ph.D./2006577002P