Obonyo, R.    

Firstname:R. 
Surname:Obonyo 
Email: 
Institute:IITA 
Homepage:http://www.iita.org 
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18 publications (0 read)





Publications as Author



2012

Surveillance approaches for cassava viruses in East and Central Africa, Legg, J., Shirima, R. R., Jeremiah, S. C., Ndyetabula, I.*, Obiero, H.*, Mkamilo, G.*, Bigirimana, S.*, Gashaka, G.*, Tata-Hangy, W.*, Okao-Okuja, G., Obonyo, R., Bouwmeester, H. and Kumar, P. L., Abstract, SP05-11 (SP11-06) in Program and Abstracts, Second Scientific Conference of the Global Cassava Partnership for the 21st Century (GCP21-II). June 18-22, 2012, Kampala, Uganda, 2012.
 
Yield losses attributed to cassava mosaic disease on major landrace cassava cultivars in Uganda. Proceedings (Poster) of the second Scientific Conference of the Global Cassava Partnership for the 21st Century, GCP21-II, Okao-Okuja, G.*, Obonyo, R. and Legg, J., Global Cassava Partnership for the 21st Century (GCP-21), 2012.
 
Yield losses attributed to cassava mosaic disease on major landrace cassava cultivars in Uganda, Okao-Okuja, G.*, Obonyo, R. and Legg, J., Abstract, SP02-17 in Program and Abstracts, second Scientific Conference of the Global Cassava Partnership for the 21st Century, GCP21-II, Speke Resort and Conference Centre, Kampala, Uganda, June 18 - 22, 2012.
 

2011

Occurrence and distribution of cassava pests and diseases in Rwanda, Night, G., Asiimwe, P., Gashaka, G.*, Nkezabahizi, D.*, Legg, J., Okao-Okuja, G., Obonyo, R., Nyirahorana, C., Mukakanyana, C., Mukase, F.*, Munyabarenzi, I* and Mutumwinka, M.*, in: Agriculture, Ecosystems and Environment, volume 140, number 3 and 4, pages 492-497, ISSN 0167-8809, 2011.
 

2010

Cassava virus disease survillence in sub-Saharan Africa, Legg, J., Kim, D., Maruthi, M. N., Bouwmeester, H., Okao-Okuja, G., Obonyo, R., Boniface, S., Jeremiah, S.*, Busungu, C., Ndyetabula, I.*, Legg, C. and Kumar, P. L., Abstract presented at the International Cassava Brown Streak Disease Workshop. Entebbe, Uganda 5-7 May, 2010.
 

2009

Cassava virus disease surveillance in sub-Saharan Africa: proceedings (Poster), FAO CaCESCA project meeting, 30 November to 3 December, 2009, Dar es Salaam, Tanzania, Legg, J., Kim, D., Maruthi, M. N., Bouwmeester, H., Okao-Okuja, G., Obonyo, R., Boniface, S., Jeremiah, S.*, Busungu, C., Ndyetabula, I.*, Legg, C. and Kumar, P. L., 2009.
 

2008

Fifteen years of cassava virus epidemics in East and Central Africa, Legg, J., Okao-Okuja, G., Obonyo, R., Boni, S., Kumar, P. L., Dixon, A., Bigirimana, S.*, Tata-Hangy, K.*, Obiero, H., Gashaka, G.*, Jeremiah, S.*, Ndyetabula, I.* and Omongo, C. S.*, in: Global Cassava Partnership-First Scientific Meeting: Cassava Meeting the challenges of the New Millennium, 21 - 25 July, 2008, Ghent University, Ghent, Belgium, pages 140, 2008.
 

2007

Distribution, incidence and severity of Cassava diseases and pests in Mozambique, Toko, M., Hanna, R., Legg, J., Andrade, M., Jone, A., Agboton, B., Otema, M, Okao-Okuja, G., Obonyo, R. and Mambo, E., in: Proceedings of the 9th ISTRC-AB Symposium, pages 623-633, Mombasa, Kenya, 2007.
 
Monitoring and diagnostic survey of cassava mosaic virus disease (CMD) in Rwanda, Kanyange, M. C.*, Night, G., Nyirahorana, C., Mukakanyana, C., Gashaka, G.*, Okao-Okuja, G., Obonyo, R., Asiimwe, P. and Legg, J., 2007.
 
Monitoring and diagnostic survey of cassava mosaic virus disease (CMD) in Uganda, Omongo, C. S.*, Poro, S., Omara, J., Omara, T.*, Okao-Okuja, G., Obonyo, R., Asiimwe, P. and Legg, J., 2007.
 
Monitoring and diagnostic survey of cassava mosaic virus disease (CMD) in Eastern Democratic Republic of Congo (Part 2), Tata-Hangy, K.*, Koffi-Tete, M., Obonyo, R., Okao-Okuja, G., Asiimwe, P. and Legg, J., 2007.
 
Monitoring and diagnostic survey of cassava mosaic virus disease (CMD) in Eastern Democratic Republic of Congo (Part 1), Tata-Hangy, K.*, Koffi-Tete, M., Obonyo, R., Okao-Okuja, G., Asiimwe, P. and Legg, J., 2007.
 

2006

Current characteristics of cassava mosaic in postepidemic areas increase the range of possible management options, Mallowa, S.*, Isutsa, D., Kamau, A., Obonyo, R. and Legg, J., in: Annals of Applied Biology, volume 149, number 2, pages 137-144, ISSN 0003-4746, 2006.
 

2004

First evidence for the spread of East African cassava mosaic virus - Uganda (EACMV-UG) and the pandemic of severe cassava mosaic disease to Burundi, Legg, J., Bigirimana, S.*, Barumbanze, P.* and Obonyo, R., in: Plant Pathology, volume 53, number 2, pages 231, ISSN Online: 1365-3059, 2004.
 
Field studies of cross protection with cassava Mosaic Geminiviruses in Uganda, Owor, B., Legg, J., Okao-Okuja, G., Obonyo, R., Kyamanywa, S.* and Ogenga-Latigo, M.*, in: Journal of Phytopathology, volume 152, number 4, pages 243-249, ISSN 1439-0434, 2004.
 
The effect of cassava mosaic geminiviruses on symptom severity, growth and root yield of a cassava mosaic virus disease-susceptible cultivar in Uganda, Owor, B., Legg, J., Okao-Okuja, G., Obonyo, R. and Ogenga-Latigo, M.*, in: Annals of Applied Biology, volume 145, number 3, pages 331-337, ISSN 0003-4746, 2004.
 

2002

Plants infected with mild strains of cassava mosaic geminiviruses (CMGs) outperform initially healthy plants under high CMG inoculum pressure conditions in Uganda, Owor, B., Legg, J., Okao-Okuja, G., Obonyo, R. and Ogenga-Latigo, M.*, in: Paper presented, Entebbe, Uganda, 2002.
 
Interactions between cassava mosaic geminiviruses and the African pandemic of cassava mosaic disease, Owor, B., Legg, J., Okao-Okuja, G., Obonyo, R. and Ogenga-Latigo, M.*, in: Paper presented, Kampala, Uganda, 2002.