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PROF. SAMUEL P. ODEYO NYALALA

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Staff Information
PERSONAL DETAILS
Designation
ASSOCIATE PROFESSOR
Corporate Email
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Job Category
Teaching
Division / Faculty
Faculty of Agriculture
Directorate / Dept
GRADUATE SCHOOL
Section
Horticulture
Address
Department of Crops, Horticulture & Soils, Egerton University, P.O. Box 536 - 20115, Egerton
SUMMARY

Prof Samuel Nyalala is an Associate Professor of Horticulture in the Department of Crops, Horticulture and Soil, and the Deputy Director, Board of Postgraduate Studies, Egerton University, and the Editor, Egerton Journal of Science and Technology. Prof Nyalala holds PhD degree in Horticultural Crop Protection from the University of Copenhagen, Denmark (2011), MSc degree in International Horticulture from the University of Essex, UK (2005), a BSc degree in Horticulture from Egerton University, Kenya (1996) and a Diploma in Horticulture from Egerton College (1985). Prof Nyalala has also attended Professional Development Course in Horticulture at Writtle College, UK (1997) and international course on Research & Development in Postharvest Physiology, Pathology and Handling of Fresh Commodities at The Volcani Centre, Israel (1999). Prof Nyalala has over 30 years of teaching experience in horticulture rising from the level of senior technician to associate professor of horticulture. As a technologist in horticulture, Prof Nyalala played a pivotal role in the implementation and management of a Horticultural Technology Experimental Project (a pioneer greenhouse crop production project) at Egerton University in collaboration with Professors from Nanjing Agricultural University, China. Prof Nyalala lectures postgraduate and undergraduate students in horticultural courses including crop protection, floriculture, ornamental horticulture, landscaping, greenhouse management, agricultural experimentation, seminars, scientific writing and emerging issues in horticulture. In addition, Prof Nyalala has supervised seven (7) postgraduate students to completion including two (2) PhDs and several on-going students. Prof Nyalala is a prolific scholar with 50 publications including three (3) books and several papers in refereed international journals. As the Deputy Director, Board of Postgraduate Studies, Prof Nyalala has drafted the following documents for improved academic standards and quality and timely completion: (i) Procedure for Online Submission, Processing and Oral Presentation of Research Proposals during the Corona Virus (Covid-19) Pandemic, DOC. NO. EU/AA/OP/33(2020), (ii) Procedure for Online Thesis Submission and Examination During the Corona Virus (Covid-19) Pandemic, DOC. NO. EU/AA/OP/34 (2020) (iii) Postgraduate Students Handbook (2021) (iv) Draft Egerton University Anti-plagiarism Policy (2021). Prof Nyalala has also been a co-PI in a number of projects including NAWASSCO/NCSP-Egerton University Project, which was part of a £3 Million five–year project co-funded by: European Union (EU) Netherlands Development Organization (SNV). Currently Prof Nyalala is involved in over £100,000 Global SCOPE project at Egerton University in collaboration with the University of Lincoln, UK on postharvest loss reduction for sustainable food supply and security. Besides, Prof Nyalala is a university consultant on tomato value chain in the Kenya Climate Smart Agricultural Project (KCSAP), a Government of Kenya project jointly supported by the World Bank to the tune of USD 250 M. Over the last 15 years, Prof Nyalala has been a consultant in conducting pesticide efficacy trials in flowers and vegetables for the major agro-chemical companies in Kenya. Prof Nyalala has trained extension officers and farmers on greenhouse management in various counties in Kenya. Prof Nyalala is also the Chairman of the Board of Management, St Paul’s Ligisa Boys Secondary School.

 

ORCID
https://orcid.org/0000-0001-6496-5029
ACADEMIC QUALIFICATIONS

2008-2011 – PhD HORTICULTURAL CROP PROTECTION (UNIVERSITY OF COPENHAGEN, DENMARK)

Thesis Title: Miticidal properties of Gynandropsis gynandra L (Briq)

2003-2005 – MSc INTERNATIONAL HORTICULTURE (WRITLLE COLLEGE, UNIVERSITY OF ESSEX, UK)

Thesis Title: African spider plant (Cleome gynandra L.) as a spider mite (Tetranychus urticae Koch) repellent in greenhouse      cultivated rose (Rosa hybrida L.)

1993-1996 – BSc. HORTICULTURE (EGERTON UNIVERSITY, KENYA)

1982-1985 – DIPLOMA IN HORTICULTURE (EGERTON COLLEGE, KENYA)

 

FIELDS OF SPECIALIZATION
  • Horticultural Crop Protection
  • Floriculture
  • Ornamental Horticulture
  • Greenhouse Crop Production
  • Landscape Horticulture
PROFESSIONAL QUALIFICATIONS
  • 2018: 5 Days Proposal Development Workshop (Virginia Tech in collaboration with Egerton University).
  • 2018: 3 Days Short Courses Development Workshop
  • 2018: 5 Days An E-Learning Capacity Building Course on Developing and Publishing of Digital Teaching and Learning Materials (Egerton University).
  • 2017: 5 Days Retooling Workshop on Research Analytics and Writing of Fundable Proposals (Virginia Tech in collaboration with Egerton University)
  • 2017: 2 Days Multi-Disciplinary Proposal Development and Project Management Workshop  (Egerton University)
  • 2010: 2 Days Research Proposal Writing Workshop (Egerton University)
  • 2008: 3 Days Pedagogy Workshop (Egerton University).
  • 2007: 3 Months Research Fellowship at Faculty of Life Sciences, University of Copenhagen, DENMARK.           
  • 2005: 4 Days Practical Training on Local Knowledge (Egerton University)
  • 2004: 4 Months Landscape Gardening Work Placement (Royal Horticultural Society, Hyde Hall Garden, UK.).
  • 2001: 3 Days Course on University Teaching Methodology (Egerton University).
  • 1999: 5 Weeks International course on Research & Development in Postharvest Physiology, Pathology and Handling of Fresh Commodities (The Volcani Centre, ISRAEL).
  • 1997: 3 Months Professional Development Course in Horticulture (Writtle College, UK).
  • 1989: 6 Weeks Grain Storage Management course (Egerton University).
  • 1987: 2 Weeks Communication skills course (Agricultural Information Centre Nairobi,).
WORK EXPERIENCE

1. March 2019 to Date - Deputy Director, Board of Postgraduate Studies (BPGS), Egerton University, Kenya.

Responsibilities: Deputising the Director, BPGS in running the directorate

 

2, August 2021 to Date - Associate Professor of Horticulture

Teaching Responsibilities: Lecturing horticultural courses to undergraduate and postgraduate students:

Other responsibilities:

  • Supervision of thesis research by postgraduate students
  • Member, Board of Postgraduate Studies, Egerton University
  • Examination of postgraduate students’ proposal and theses
  • Supervision of research projects by undergraduate students
  • Conducting research in horticulture and other crop sciences
  • Facilitating horticultural training sessions for farming communities.

 

3. February 2023 to Date - Editor, Egerton Journal of Science and Technology

Responsibilities: Ensure the Journal is published annually in a timely manner moving toward biannual
publication; Work on marketing the Journal; Review regularly the performance of the Journal in the market and readership; Advise the Director (R&E) on matters affecting the Journal

 

4. July 2014 to 2021 – Senior Lecturer in Horticulture, Egerton University, Kenya

Teaching Responsibilities: Lecturing horticultural courses to undergraduate and postgraduate students:

Other responsibilities:

  • Supervision of thesis research by postgraduate students
  • Chairman, Faculty of Agriculture Postgraduate Committee
  • Chairman, Departmental Postgraduate Committee
  • Member, Board of Postgraduate Studies, Egerton University
  • Examination of postgraduate students’ proposal and theses
  • Supervision of research projects by undergraduate students
  • Conducting research in horticulture and other crop sciences
  • Facilitating horticultural training sessions for farming communities

 

5. 2010- 2014 - Lecturer in Horticulture, Egerton University, Kenya

Teaching Responsibilities: Lecturing horticultural courses to undergraduate and postgraduate students:

Other responsibilities:

  • Supervision of thesis research by postgraduate students
  • Serving in the Faculty of Agriculture Postgraduate Committee
  • Supervision of research projects by undergraduate students
  • Coordination of academic visits for Horticulture students.
  • Member, Horticultural Research and Teaching Field Committee.

 

6. 2006 to 2010 – Assistant Lecturer in Horticulture, Egerton University, Kenya

Teaching Responsibilities: Lecturing horticultural courses and conducting practical sessions for undergraduate and postgraduate students.

Other responsibilities:

  • Transferring of greenhouse tomato production technology to farmers.
  • Supervision of research projects by undergraduate students
  • Coordination of academic visits for Horticulture students.
  • Serving in the Faculty Staff Training and Development Committee

 

7. 1989 - 2005 - Senior Technician: Department of Horticulture, Egerton University      

Teaching Responsibilities: Conducting practical sessions of horticultural courses for Diploma, B.Sc. and M. Sc. degree students:

Technical Responsibilities:

  • Planning and execution of technical operations in the Horticulture Demonstration Field and managing Research Plots.
  • Implementation and management of a Horticultural Technology Experimental Project (Greenhouse crop production project) in collaboration with Visiting Chinese Professors.
  • Fabrication and installation of Egerton University Prototype greenhouses.

Other responsibilities:

  • Transferring of greenhouse tomato production technology to farmers.
  • Coordination of visits to Horticulture Department by farmers groups, staff and students from other institutions among others.
  • Demonstrating greenhouse technology in Agricultural Society of Kenya Shows.

8. 1985-1989: Assistant Agricultural Officer, Ministry of Agriculture, Kenya

Responsibilities: supervision of technical and administrative staff at location and divisional levels; conducting training sessions for the District Subject Matter Specialists, Front-line Extension Workers, Technical staff from Non- governmental Organizations, Women Groups and farmers in a wide range of horticultural and general crop production subjects; organization of Agricultural Shows, Field days and On-farm demonstrations and planning, implementation and evaluation of agricultural development programmes and projects in the area of jurisdiction.

KEY PROJECTS

2022 - Present

USD 283,464.50 The World Bank Group, International Finnace Coprporation Consultancy Project. Our assignment in the project is to  undertake the development and establishment of Centers of Excellence to produce 5 horticultural crops in Kenya.

2019- Present

About RMB 4.4 million China-Kenya Belt and Road Joint Laboratory on Crop Molecular Biology Project funded by Nanjing Agricultural University and Chinese Ministry of Science and Technology. The project aims at fighting the challenges threatening global food security through establishment and equiping of modern laboratories, and facilitating faculty and student exchange for technology transfer.

2019-present

Over £100,000 Global SCOPE project at Egerton University in collaboration with the University of Lincoln, UK on postharvest loss reduction for sustainable food supply and security. Our assignment in the project is to identify critical points of postharvest and nutritional losses along the crop supply chains and develop low-cost technologies for mitigating the losses.

2019-2021

Kenya Climate Smart Agricultural Project (KCSAP). This is a Government of Kenya project jointly supported by the World Bank to the tune of USD 250 M. The main objective of KCSAP is to increase agricultural productivity and enhance resilience or copying mechanisms to climate change risks in the targeted smallholder farming and pastoral communities in Kenya. The project is being implemented over a five year period (2017-2022). Our assignment in the project is to provide technical capacity services for the implementation of Technologies, Innovations and Management Practices (TIMPS) for tomato value chain in Kajiado County, Kenya.

2006-present

Pesticide efficacy trials for registration in Kenya for use in cut flowers, ornamental plants and vegetable crops. The efficacy trials have been conducted for multinational and local agrochemical companies in Kenya including: Syngenta East Africa, Bayer East Africa, Koppert Biological Systems, Kenya Biologics, DuduTech, Bioproduction Kenya, Osho Chemicals, Orbit Chemicals, Elgon Kenya, Greenlife, Hangzhou Agrochemicals Industries, Twiga Chemicals among others.

2014-2017

Collaborative project between Egerton University and Nakuru Water And Sanitation Services Company (NAWASSCO) /Nakuru County Sanitation Programme (NCSP) as part of £3 Million five–year project co-funded by: European Union (EU) Netherlands Development Organization (SNV). The project aimed at improving crop productivity and safety through development and testing of processed faecal matter as soil amendment and organic fertiliser. Our assignment was to conduct field experiments to: determine the response of test crops to the different processed faecal matter products (nutrient content and form), assess the heavy metals accumulation in cabbage (Brassica oleracea var capitata) grown using sewage sludge, and evaluate the efficacy of faecal fertilizers on growth, nutrient uptake and yield of maize.

2014-2015

Development of growing manuals and training of agricultural extension agents and farmers in Homa Bay , Machakos and Vihiga Counties , Kenya on Greenhouse Crop Production.

2007 -2010

Consultancies on development of growing manuals and training of technical staff of various flower farms on cut flower production. The farms trained included: Equator Flowers, Fontana Flowers, Karen (Ravine) Roses, Kreative Flowers, Maji Mazuri Flowers, Sian Agriflora and Winchester Flowers.

 

 

RESEARCH INTERESTS
  1.  Integrated pest and disease management in horticultural crops
  2. Greenhouse crop production and management
  3. Biofumigation using African spider plant (Gynandropsis gynandra)
  4. Miticidal/repellent properties of Gynandropsis gynandra)
  5. Horticultural crop nutrition·        
  6. Postharvest loss reduction in cut flowers and other horticultural crops        
  7. Development of new ornamental plants 
LIST OF PUBLICATIONS

  1. Lilian A. Okiro, Richard M. Mulwa1, Maurice E. Oyoo and Samuel Nyalala (2024). The danger of the spread of Ralstonia solanacearum on potato crops worldwide and potential mitigation options. CABI Reviews (2024) 19:1 https://doi.org/10.1079/cabireviews.2024.0014

  2. Marie Chantal Mutimawurugo, Isabel Nyokabi Wagara, Joshua Otieno Ogweno and Samuel Nyalala (2023). Effective application frequency of selected plant extracts on potato growth and yield parameters. Italus Hortus, 30 (2023), 59-69. doi: 10.26353/j.itahort/2023.3.5969

  3. Faustine Christopher, Patrick Ndakidemi, Samuel Nyalala, Ernest Mbega (2023). Antifungal activity of Leonotis nepetifolia extracts against Colletotrichum species causing bean anthracnose and their phytochemical analysis using LC-MS. Journal of Natural Pesticide Research, 6(2023), 100057. https://doi.org/10.1016/j.napere.2023.100057

  4. Aristide Nshuti Niyokuri, Samuel Nyalala (2023). Calla lily soft rot causal agents, symptoms, virulence and management: A review. International Journal of Horticultural Science, 29, 60-68. https://doi.org/10.31421/ijhs/29/2023/11380

  5. Faustine Christopher, Patrick Ndakidemi, Samuel Nyalala and Ernest Mbega (2022). Antifungal Activities of Some Medicinal Plants Against Colletotrichum lindemuthianum, The Causal Pathogen of Bean Anthracnose, and Their Effect on Seed Germination and Seedling Performance. Applied Biological Research 24(4): 484-493. DOI: 10.5958/0974-4517.2022.00062.3

  6. Ephrem Nkurunziza, Samuel Nyalala, Karemera Noëlla Josiane Umuhoza (2022). Sand amended with carbonised rice husk and goat manure as a propagation medium. Agricultura Tropica Et Subtropica, 55, 202–213. DOI: 10.2478/ats-2022-0021

  7. Nkurunziza, E., Nyalala, S. & Umuhoza, K. N. J. (2022). Effect of seedling quality on growth, yield and quality of tomato (Solanum lycopersicum L.). International Journal of Horticultural Science, 28, 64-72. https://doi.org/10.31421/ijhs/28/2022/10836

  8. Nkurunziza Ephrem, Samuel Nyalala and Umuhoza Karemera Noëlla Josiane (2022). Suitability of sand amended with carbonized rice husks and goat manure as a growing medium. Journal of Horticulture and Forestry, 14(1), 10-15.

    DOI: 10.5897/JHF2021.0684

  9. Faustine Christopher, Patrick A. Ndakidemi, Samuel Nyalala, Ernest R. Mbega (2022). The current status, farmers’ management practices, knowledge,and perceptions of common bean anthracnose in Tanzania. International Journal of Biosciences, 20 (2), 162-175.http://dx.doi.org/10.12692/ijb/20.2.162-175

  10. Innocent Nyalala, Cedric Okinda, Qi Chao, Peter Mecha, Tchalla Korohou, Zuo Yi, Samuel Nyalala, Zhang Jiayu, Liu Chao & Chen Kunjie (2021). Weight and volume estimation of single and occluded tomatoes using machine vision. International Journal of Food Properties, 24:1,818-832, DOI: 10.1080/10942912.2021.1933024.

  11. P.C. Otieno, S. Nyalala, J. Wolukau (2020). Optimization of biosolids as a substrate for tomato transplant production. Advances in Horticultural Science, 34(3): 313323 DOI: 10.13128/ahsc8118
  12. Ndereyimana, A; Nyalala, S; Murerwa, P.; Gaidashova, S. (2020). Growth, yield and fruit quality of tomato under different integrated management options against Tuta absoluta Meyrick. Advances in Horticultural Science, 34(2): 123132. DOI: 10.13128/ahsc7835
  13. Ndereyimana, A; Nyalala, S; Murerwa, P.; Gaidashova, S. (2020). Field efficacy of entomopathogens and plant extracts on Tuta absoluta Meyrick (Lepidoptera: Gelechiidae) infesting tomato in Rwanda. Crop Protection, 134: 105183 https://doi.org/10.1016/j.cropro.2020.105183
  14. Peter Caleb Otieno, Samuel Nyalala and Joseph Wolukau (2020). Postharvest Quality and Safety of Potted Greenhouse Tomato Grown on Forest Soil-Biosolids substrate, Blended with NPK Fertilizer. NASS Journal of Agricultural Sciences, 02 (02): 15-23 DOI: https://doi.org/10.36956/njas.v2i2.117
  15. Stella Jerono Keter Samuel Nyalala Joshua Ogweno (2020). Biofumigation Efficacy of Spider Plant (Cleome gynandra L.) Accessions on Nematode Control in Tuberose (Polianthes tuberosa L.). NASS Journal of Agricultural Sciences, 02 (02): 24-36 DOI: https://doi.org/10.36956/njas.v2i2.115
  16. Wayne Martindale, Isobel Wright, Lilian Korir, Arnold M. Opiyo, Benard Karanja, Samuel Nyalala, Mahesh Kumar, Simon Pearson, Mark Swainson (2020). Framing food security and food loss statistics for incisive supply chain improvement and knowledge transfer between Kenyan, Indian and United Kingdom food manufacturers. Emerald Open Research, (https://doi.org/)
  17. Assinapol Ndereyimana, Samuel Nyalala, Patrick Murerwa and Svetlana Gaidashova (2019). Pathogenicity of some commercial formulations of entomopathogenic fungi on the tomato leaf miner, Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae). Egyptian Journal of Biological Pest Control (2019) 29:70. https://doi.org/10.1186/s41938-019-0184-y
  18. Ndereyimana, A; Nyalala, S; Murerwa, P.; Gaidashova, S. (2019). Bioactivity of plant extracts against tomato leaf miner, Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae). Journal of Applied Horticulture, 21(2): 146-150 (www.horticultureresearch.net)
  19. Assinapol Ndereyimana, Samuel Nyalala, Patrick Murerwa and Svetlana Gaidashova (2019). Potential of entomopathogenic nematode isolates from Rwanda to control the tomato leaf miner, Tuta absoluta (Meyrick) (Lepidoptera: Gelechiidae). Egyptian Journal of Biological Pest Control (2019) 29:57.https://doi.org/10.1186/s41938-019-0163-3
  20. Peter Caleb Otieno, Samuel Nyalala and Joseph Wolukau (2019). Suitability of biosolids from university sewage ponds as a substrate for crop production. African Journal of Agricultural Research, 14(35), 2062-2074. DOI: 10.5897/AJAR2019.14231
  21. Juma K.N., Nakhone L., Musandu A.A.O., Nyalala S., Ogendo J.O, and Kimaru, L. (2018. Response of potato to different soils and fecal matter fertilizers. African Journal of Agricultural Research, 13(36), 1880-1887. DOI: 10.5897/AJAR2018.13279
  22. Ogendo, J. O., Nyalala, S., Nakitare, K. J., Nakhone, L., Musandu, A.A.O., Ochieng, J. and Kimaru, L. (2018). Efficacy of Fecal Fertilizers on Growth, Nutrient Uptake and Yield of Maize. African Journal of Food Agriculture Nutrition and Development, 18(3): 13743-13760 DOI: 10.18697/ajfand.83.18015
  23. Niyokuri A.N., Nyalala S., Mwangi M. (2018). Residual effects of bioslurry and amino acids plant biostimulant on carnation (Dianthus caryophyllus L.) flower quality. Advances in Horticultural Science 32(1): 137-142 DOI: 10.13128/ahs-21148
  24. Juma K.N., Nakhone L., Musandu A.A.O., Nyalala S., Ogendo J.O, and Kimaru, L. (2018). Availability of Nitrogen, Microbial Respiration and Bulk Density as Influenced by Faecal Matter Fertiliser in Acrisol, Andosol and Planosol. Journal of Soil Science & Plant Health 2:1. (www.scitechnol.com)
  25. Niyokuri, A.N., Nyalala, S. and Mwangi, M. (2017). Effects of bioslurry and plant biostimulant Hicure® on yield, flower quality and vase life of carnation (Dianthus caryophyllus L.). Journal of Applied Horticulture, 19(1): 29-34. (www.horticultureresearch.net)
  26. Githeng'u, S., Nyalala, S. and Gaoqiong, L. (2016). In-vitro Antibacterial Activity of Coptis Chinensis Extract Against Pectobacterium Carotovorum Sub sp. Carotovorum. International Journal of   Phytopathology 05 (02) 61-66 (www.escijournals.net/phytopathology)
  27. Nyalala, S.P.O, Li, Y., Opetu, G., Liu G., Zhang H., Wolukau, J.N. and Sheng, X. (2016). Agricultural Development and Applicable Technology in Africa: Farming in Kenya. Zhejiang Science and Technology Publishing House, China/Egerton University Press, ISBN 978-7-5341-5769-1/ISBN 978-9966-060-79-2
  28. Chongori, G.O., Nyalala, S. and Mwangi, M. (2016). African spider plant (Cleome gynandra L.) as biofumigant against weeds during Turfgrass (Paspalum notatum) establishment. Journal of Horticulture and Forestry, 8(6): 44-50 DOI: 10.5897/JHF2016.0446
  29. Githeng'u, S., Nyalala, S. and Gaoqiong, L. (2015). Effect of Drenching Coptis Chinensis Franch Extract on Soft Rot of Zantedeschia 'Black Magic'. Acta Horticulturae 1077:105-110. https://doi.org/10.17660/ActaHortic.2015.1077.10
  30. Nyalala, S.O. and Grout, B.W.W (2015). Volatile Emissions from Actively-Growing Gynandropsis gynandra and Cleome hasseleriana to Control Spider Mites in Protected Rose Cultivation. Acta Horticulturae 1064:299-302 https://doi.org/10.17660/ActaHortic.2011.917.6
  31. Nyalala, S. (Nyalala, S. (2015). Downy Mildew of Roses. Florinews 9: 10-11
  32. Nyalala, S. (2014a). The Leaf Greening Effect. Florinews 8: 18-19
  33. Nyalala, S. (2014b). Biostimulants: A Boon to Flower Growers. Florinews 7: 4-6
  34. Nyalala, S.   (2014c). Reducing postharvest losses in horticultural crops. Hortfresh Journal November- December pp 26
  35. Kirkegaard, N., Nyalala, S., Grout, B. (2014). Do the deposits left by weaver ants on developing mango fruits repel fruit flies, thereby reducing egg-laying into the fruits? Pheromones and other semiochemicals IOBC-WPRS Bulletin 99, 177-181
  36. Nyalala, S.O., Grout, B.W.W., Petersen, M.A. (2013). Volatile compounds from leaves of the African spider plant (Gynandropsis gynandra) with bioactivity against spider mite (Tetranychus urticae) Annals of Applied Biology 162, 290–298. doi:10.1111/aab.12021
  37. Nyalala, S.P.O (2011a). Miticidal properties of Gynandropsis gynandra L (Briq). PhD. Thesis, University of Copenhagen, Denmark.
  38. Nyalala, S.O., Alemayehu, S., Grout, B.W.W., Petersen, M.A. (2011b). Volatile Emissions of Methyl Cyanide from Leaves of Gynandropsis gynandra L. (Briq.) as a Possible Spider Mite Repellent. Acta Horticulturae 917, 55-61 https://doi.org/10.17660/ActaHortic.2011.917.6
  39. Nyalala, S.O., Petersen, M.A., Grout, B.W.W. (2011c). Acetonitrile (methyl cyanide) emitted by the African spider plant (Gynandropsis gynandra L. (Briq)): Bioactivity against spider mite (Tetranychus urticae Koch) on roses. Scientia Horticulturae 128, 352–356. doi:10.1016/j.scienta.2011.01.036
  40. Nyalala, S. and Grout, B. (2007). African spider flower (Cleome gynandra L./Gynandropsis gynandra (L.) Briq.) as a red spider mite (Tetranychus urticae Koch) repellent in cut-flower rose (Rosa hybrida L.) cultivation. Scientia Horticulturae 114, 194–198 www.elsevier.com/locate/scihorti
  41. Nyalala, S (2006a). Zantedeschia: A cut flower for diversification. FlowerTech Vol. 9 (3): 12-14
  42. Nyalala, S (2006b). Devising an anti-nematode strategy in the Rose crop. FlowerTech Vol. 9 (3): 22-24
  43. Nyalala, S (2006c). Manipulating Phaelonopsis stem length. FlowerTech Vol. 9 (4): 28-30
  44. Nyanjage, M.O., Nyalala, S.P. O., Illa, A.O., Mugo, B.W., Limbe, A.E. and Vulimu, E.M. (2005). Extending the postharvest life of sweet pepper (Capsicum annuum L.) ‘California Wonder’ with modified atmosphere packaging and storage temperature. Agricultura Tropica ET Subtropica Journal Vol. 38 (2) 28-32
  45. Liu, G., Nyalala, S. P. O, Nyanjage, M. O. and Tuitoek, D.K Eds. (2005). Greenhouse Management. Egerton University Press, Njoro, Kenya. ISBN 9966-838-59-7
  46. Nyalala, S.P.O (2004). African spider flower (Cleome gynandra L.) as a spider mite (Tetranychus urticae Koch) repellent in cultivated rose (Rosa hybrida L.). M. Sc. Thesis, Writtle College, University of Essex (UK).
  47. Kere, G.M., Nyanjage, M.O., Liu, G. and Nyalala, S.P.O. (2003). Influence of Drip Irrigation Schedule and Mulching Material on Yield and Quality of Greenhouse Tomato (Lycopersicon esculentum Mill.) ‘Money Maker’. Asian Journal of Plant Sciences 2 (14): 1052-1058
  48. Nyanjage M.O., Nyalala S.P.O., Ochieng J.A M., and Liu G. (2002). Integrated Farming Systems for Rural Development in the Lake Victoria Region of Western Kenya: A Review. Agricultura Tropica ET Subtropica Journal Vol. 35, 195 –203
  49. Liu, G. and Nyalala, S.P.O. (2002). Greenhouse Tomato Production: Do IT Yourself Manual. Egerton University Press, Njoro, Kenya.
  50. Nyalala, S.P.O and Wainwright, H. (1998). The shelf-life of Tomato (Lycopersicon esculentum) cultivars at different storage temperatures. Tropical Science Journal 38, 151 – 154
CONFERENCES & INVITED PRESENTATIONS
  1. Samuel Nyalala (2023). The International Centre for Evaluation and Development (ICED) and Feed the Future Horticulture Innovation Lab Conference on “Resilient Fruit and Vegetable Value Chains: Nourishing Our Lives, Empowering local communities and cottage industries” on 24 May 2023 at Trademark Hotel, Nairobi, Kenya.
  2. Peter Caleb Otieno, S. Nyalala and J. Wolukau (2018). Impact of Blending Biosolids-Forest Soil with NPK Fertilizer on Postharvest Quality and Safety of Greenhouse Tomato (Solanum lycopersicum L.). Egerton University, Department of Crops, Horticulture and Soils, P.O. Box 536-20115, Egerton, Kenya. Sixth (6th) Chuka University International Research Conference from 6th to 8th November 2019.
  3. Assinapol Ndereyimana, Samuel Nyalala, Patrick Murerwa and Svetlana Gaidashova (2019). Pathogenicity of selected commercial entomopathogenic fungal formulations on tomato leaf miner, Tuta absoluta Meyrick. African Potato Association Conference 25-29th August 2019, Kigali, Rwanda
  4. Peter Caleb Otieno, Samuel Nyalala and Joseph Wolukau (2019). Biosolids-Forest soil mixture Blended with NPK Fertilizer as substrate for Growth and Yield of Greenhouse Tomato Egerton University, Department of Crops, Horticulture and Soils, P.O. Box 536-20115, Egerton, Kenya. Rongo University 2nd International Multidisciplinary Research Conference 12th – 16th August 2019.
  5. P. C. Otieno., Nyalala, S. and Wolukau, J. (2018). Suitability of biosolids from university sewage Ponds as a substrate for crop production. HAK Scientific Workshop, Taita Taveta University, 18th Research conference from 26th -30th Nov. 2018.
  6. P.C. Otieno*, S. Nyalala and J. Wolukau (2018). Optimization of Biosolids as a Substrate for Tomato Transplant Production, 1Egerton University, Department of Crops, Horticulture and Soils, P.O. Box 536-20115, Egerton, Kenya. Sixth African Higher Education Week and Ruforum Biennial Conference 21-26th October 2018 Nairobi Kenya
  7. Nyalala, S.O. and Grout, B.W.W (2015). Volatile Emissions from Actively-Growing Gynandropsis gynandra and Cleome hasseleriana to Control Spider Mites in Protected Rose Cultivation. ISHS VI International Symposium on Rose Research and Cultivation, Hannover, Germany
  8. Chongori, G.O., Nyalala, S. and Mwangi, M. (2014). African Spider Plant (Cleome gynandra) As a Biofumigant against Weeds in Paspalum Turfgrass (Paspalum notatum). Bridging the Gap between Science, Society and Industry” conference held at Kenyatta University, Nairobi, Kenya, 1st – 5th December 2014.
  9. Nyalala, S.O., Petersen, M.A., Grout, B.W.W. (2013). Growing conditions and developmental stage influence the abundance of miticidal volatile compounds in leaves of Gynandropsis gynandra L. (Briq). First International Conference on Pesticidal Plants, January 21-24, 2013, ICIPE, Nairobi, Kenya
  10. Githeng’u, S., Nyalala, S., Liu, G. (2013). Effect of Drenching Coptis chinensis Franch Extract on Soft Rot, Flower Yield and Quality of Zantedeschia ‘Black Magic’. ISHS First International Symposium on Ornamentals in Africa, 9th -13 September 2013, Morendat, Naivasha, Kenya.
  11. Nyalala, S.O., Alemayehu, S., Grout, B.W.W., Petersen, M.A., (2010). Volatile emissions of methyl cyanide from leaves of Gynandropsis gynandra as a possible spider mite repellent. ISHS 28th International Horticultural Congress, Lisbon.
  12. Nyalala, S.O., Petersen, M.A., Grout, B.W.W. (2010). Bioactivity of methyl cyanide emitted from African spider plant (Gynandropsis gynandra L. (Briq) against spider mite (Tetranychus urticae Koch) on roses. 10th HAK Workshop 8th -11th Nov 2010. JKUAT, Kenya.
HONORS, PRIZE AND AWARDS
  1. Bronze medal (International Horticultural Congress, 2010). Poster award “Volatile emissions of methyl cyanide from leaves of Gynandropsis gynandra as a possible spider mite repellent”. ISHS 28th International Horticultural Congress, Lisbon, Portugal.
  2. First Prize (DAAD, 2010) .Oral presentation “Bioactivity of methyl cyanide emitted from African spider plant (Gynandropsis gynandra (briq) against spider mite (Tetranychus urticae Koch) on roses”. HAK 10th Workshop, AICAD, JKUAT, Nairobi, Kenya.
  3. PhD Scholarship (2008). University of Copenhagen, Denmark
  4. Research Fellowship (2007). Danish International Development Agency (DANIDA)
  5. Work Placement Fellowship (2004). Leonardo da Vinci Educational Programme, The Netherlands
  6. MSc Scholarship (2003). Marshall Papworth Scholarship Programme, UK
  7. Research & Development Fellowship (1999). The Centre for International Agricultural Development Cooperation (CINADCO), Israel Embassy, Kenya
  8. Professional Development Fellowship (1998). British Council, Kenya
  9. Best student (Egerton College, 1985). Overall best performance in Final Diploma Examinations.
TEACHING AREAS

Undergraduate courses

  1. Floriculture
  2. Greenhouse Crop Production
  3. Greenhouse Management
  4. Horticultural Crop Protection
  5. Horticultural plant identification
  6. Interior Plantscaping
  7. Landscape Design, Construction and maintenance
  8. Ornamental Horticulture
  9. Plant Nursery Management
  10. Principles and Practices of Fruit and Vegetable Production
  11. Research Projects

 

Postgraduate courses

  1. Advances in Greenhouse management
  2. Advances in Ornamental and Landscape Horticulture
  3. Growing Media and Nutrition of Horticultural Crops
  4. Scientific Writing and Seminars
  5. Independent Study in Horticulture
  6. Contemporary and Emerging Issues in Hiorticulture
  7. Physioplogy and Biotechnology of Horticultural Crops

 

POSTGRADUATE SUPERVISION
MASTERS LEVEL :

Completed:

  1. Ephrem Nkurunziza (2022).   Effect of Sand Amended with Carbonized Rice Husk and Goat Manure on Transplants and Field Performance of Tomato (Solanum lycopersicum L.). Egerton University.

  2. Stella Keter (2021). Biofumigation Efficacy of Spider Plant (Cleome gynandra L.) Accessions on Nematode Control in Tuberose (Polianthus tuberose L.). Egerton University.

  3. Niyokuri Nshuti Aristide (2016). Effects of Bioslurry and Plant Biostimulant, Hicure ® on Growth, Yield and Postharvest Quality of Carnation (Dianthus Caryophyllus L.). Egerton University

  4. Grace Odero Chongori (2015). Efficacy of Biofumigation Using African Spider Plant (Cleome Gynandra) on Weed Control, Growth and Quality of Paspalum Turfgrass (Paspalum notatum). Egerton University

  5. Stephen Kironji Githeng’u (2014). Effect of Coptis Chinensis Franch Extract on Erwinia Soft Rot, Growth, Yield and Quality of Calla Lily (Zantedeschia sp.). Egerton University.

Ongoing:

  1. Lorine Ochari. Effects of Irrigation Frequency and Repellent Plants on False Codling Moth (Thaumatotibia leucotreta) Infestation, Growth, Yield and Quality of Sweet Pepper.
  2. Nelly Odhiambo. Evaluation of Application Rates and Methods of Gliricidia sepium against Thrips and Its Effects on Growth, Yield and Quality of Chives (Allium schoenoprasum).
  1. Constance Otieno. Effect of Orange Climber (Toddalia asiatica) Leaf Extract and Irrigation Levels on Late Blight Infection, Yield and Quality of Tomato.
PhD. LEVEL :

Completed:

  1. Peter Caleb Otieno (2021). Biosolids as Substrate for Greenhouse Tomato (Solanum lycopersicum L.) Production. Egerton University.
  2. Ndereyimana Assinapol (2020). Development of Options for Integrated Pest Management of Tuta absoluta Meyrick (Lepidoptera: Gelechiidae) for Enhanced Tomato Productivity in Rwanda. Egerton University.

Ongoing:

  1. Niyokuri Nshuti Aristide. Characterization and Evaluation of Kenyan and Rwandan Calla Lily [zantedeschia Aethiopica (l.) Spreng.] Accessions for Soft Rot Tolerance and Field Performance. Egerton University.
  2. Faustine Christopher. Characterization of Colletotrichum species Associated with Anthracnose in Common Bean and Development of Botanical Based Management in Tanzania and Kenya. The Nelson Mandela - African Instution of Science and Technology, Arusha.

 

OTHER SOCIETIES
  1. International Society for Horticultural Science (ISHS)
  2. Danish Development Research Network (DDRN)
  3. NOVA University Network
  4. Kenya Horticultural Society
  5. Horticultural Association of Kenya
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