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Improving lives by solving problems in agriculture and the environment
Staff image of Daniel  Karanja

Daniel Karanja Deputy Director, Development, Africa

T: +254 (0)20 7224462


CABI, Canary Bird, 673 Limuru Road, Muthaiga, PO Box 633-00621, Nairobi, Kenya

I have broad technical knowledge in developing vibrant, pluralistic and market-oriented, pro-poor sustainable seed systems in developing countries that involve both the public and private sectors; all phases of pre and post-harvest crop protection - including extension, training, integrated production and pest management (IPPM), regulatory (plant quarantine, pesticide control) and applied research, based on extensive experience and knowledge of crop protection problems in tropical crops. In addition, I have extensive knowledge and experience of innovation systems approaches: participatory technology development; and development of bio-rational pesticides (biologicals and botanicals). I also have sound practical knowledge of cross-cutting issues related to socio-economic factors in the utilization of scientific and technical knowledge. I have a successful track record in the use of information and communication strategies and systems to deliver technical, awareness and crop disease management information to smallholder farmers.

Project image: Controlling Japanese knotweed in Great Britain

mNutrition: Addressing hidden hunger through mobile messaging

One in three people in the developing world suffer from ‘hidden hunger’, or micronutrient deficiency, due to a lack of information on proper nutrition. This is a major cause of illness, poor growth, reduced productivity and impaired cognitive development. To help combat the problem, CABI and its partners in...
Project image: Controlling Japanese knotweed in Great Britain

Promoting good seed in East Africa

African Indigenous Vegetables (AIVs) are key to food security and income generation in Africa and are increasing in demand. Not only will CABI’s project team be promoting their consumption and generating more demand, we will also be building awareness of the vegetable and the seeds, improving access to them...
Project image: Controlling Japanese knotweed in Great Britain

Scaling up interactive ICT to increase agricultural innovation in Tanzania

Despite Tanzania’s immense agricultural potential, farm productivity is hindered by inadequate knowledge and customary practices on farm management. The project Upscaling Technologies in Agriculture through Knowledge Extension (UPTAKE) targets small-scale farmers through geographical mobile and radio...
  1. S Rajendran, S. Afari-Sefa, V., Karanja, D. K., Musebe, R., Romney, D., Makaranga, M.A., Samali, S. and Kessy, R. F. (2015). Technical efficiency of traditional African vegetable production: A case study of smallholders in Tanzania. Journal of Development and Agricultural Economics. 7(3): 92-97

  2. S Rajendran, S. Afari-Sefa, V., Karanja, D. K., Musebe, R., Romney, D., Makaranga, M.A., Samali, S. and Kessy, R. F. (2015). Impact of nutritional perceptions of traditional African vegetables on farm household production decisions: a case study of smallholders in Tanzania. Experimental Agriculture. (DOI: 14 pp. Published online: 20 May 2015

  3. Afari-Sefa, V., ChagomokaT., Karanja, D.K., Njeru, E., Samali, S., Katunzi A., Mtwaenzi, H. and Kimenye, L. (2013). Private Contracting versus Community Seed Production Systems: Experiences from Farmer-Led Seed Enterprise Development of Indigenous Vegetables in Tanzania. Acta Hort. 1007: 671-680.

  4. Karanja, D., Musebe, R., Gitonga, W., Cossa, L., Mungai, A.,  Macharia, J., Gitunu, A., Gikandi, A.,  Muthoni, L., Flood, J. and Kimani, M. (2012). Comparative analysis of production practices and post-harvest handling of cotton by smallholder farmers in Kenya and Mozambique. Cotton Research Journal, July – December 2012: pp. 202 - 212.

  5. Mulema, J., Vicente, J., Pink, D., Jackson, A., Chacha, D., Wasilwa, L., Kinyua, M., Karanja, D., Holub, E. and Hand, P. (2012). Characterization of isolates that cause black rot of crucifers in East Africa. European Journal of Plant Pathology 133: 427–438.

  6. Karanja , D. K., Gowen, S. R., Ndung’u, B., Karanja, P. K., Musebe, R. O., Pembroke, B., Simons, S., McLeod, A. and Kerry, B. R. (2011). Farmer participatory evaluation of nursery bed treatments for the control of root-knot nematodes (Meloidogyne javanica (Treub) Chitwood and Meloidogyne incognita (Kofoid and White) Chitwood) in smallholder farms in Kenya. Journal of Agricultural Science and Technology A 1: 647-662.

  7. Page, S.L.J., Karanja, D.K., Mbwaga, A.M., Letayo, E.A.S. and Nsemwa, L.T.H. (2010). The underlying cause of the 2009 sorghum failure in Kongwa district and its implications for Tanzania’s vulnerability to climate change. Food Sec. 2:157–167.

  8. Romney, D., Efa, N., Karanja, D., Agwanda, C., Kuhlman, U., Phiri, N., Kimani, M., Musebe, R., Day, R., Grossriede, M., Jones, N., Jones, H., Fish, J. and Boa, E. (2010). Use of practical examples from CABI, a science based organization, to illustrate how more impact may be gained from research based knowledge. Innovation Asia-Pacific Symposium, 4-7 May 2009, Kathmandu, Nepal

  9. Phiri, N. A., Karanja, D., Kimani, M. and Spence, N. J. (2007).  Integrated management practices for the control of important crop diseases in developing countries. In: Proceedings of The BCPC XVI International Plant Protection Congress, 15 - 18 October 2007. Glasgow, Scotland. Pp. 734-735.

  10. McLeod, A., Ndung'u, B., Karanja, D. and Karanja, P. (2002). Farmer evaluation of biocontrol methods against root-knot nematodes in tomatoes. In: Proceedings of the COR Conference, (Powell et al., Eds.) 26-28th March 2002, Aberystwyth. UK Organic Research 2002. pp. 123-124.