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Cassava brown streak disease (CBSD), caused by cassava brown streak viruses, is recognized as one of the most important plant disease threats to African food security. This study describes the incidence and severity of the different symptom types caused by CBSD, derived from extensive surveys in ...


Ndyetabula, I.L.Merumba, S.M.Jeremiah, S.C.Kasele, S.Mkamilo, G.S.Kagimbo, F.M.Legg, J.P.[Analysis of interactions between cassava brown streak disease symptom types facilitates the determination of varietal responses and yield losses]Analysis of interactions between cassava brown streak disease symptom types facilitates the determination of varietal responses and yield losses

A survey was conducted from April to May 2014 in 214 farmers’ fields located across six major cassava-producing provinces (Western, Northwestern, Northern, Luapula, Lusaka, and Eastern) of Zambia to determine the status of cassava mosaic disease (CMD) and the species diversity of associated cassa...


Mulenga, R.M.Legg, J.P.Ndunguru, J.Miano, D.W.Mutitu, E.W.Chikoti, Patrick ChizaAlabi, O.J.[Survey, molecular detection and characterization of geminiviruses associated with cassava mosaic disease in Zambia]Survey, molecular detection and characterization of geminiviruses associated with cassava mosaic disease in Zambia

All Bemisia tabaci individuals harbour an obligate bacterial symbiont (Portiera aleyrodidarum), and many also harbour non-essential facultative symbionts. The association of symbiotic bacteria with the various genetic groups of B. tabaci remains unknown for East Africa. This study aimed to assess...


Tajebe, L.Guastella, D.Cavalieri, V.Kelly, S.Hunter, M.Lund, O.Legg, J.P.Rapisarda, C.[Diversity of symbiotic bacteria associated with Bemisia tabaci (Homoptera: Aleyrodidae) in cassava mosaic disease pandemic areas of Tanzania]Diversity of symbiotic bacteria associated with Bemisia tabaci (Homoptera: Aleyrodidae) in cassava mosaic disease pandemic areas of Tanzania

The whitefy Bemisia tabaci, a species complex consisting of many morphologically indistinguishable species divided into distinct clades, is one of the most globally important agricultural pests and plant virus vectors. Cassava-colonizing B. tabaci transmits viruses that cause cassava mosaic disea...


Chen, W.Wosula, Everlyne N.Hasegawa, D.K.Casinga, C.Shirima, R.R.Fiaboe, K.K.M.Hanna, R.Fosto, A.Goergen, Georg E.Tamò, M.Mahuku, George S.Murithi, H.M.Tripathi, L.Mware, B.Kumar, P.L.Ntawuruhunga, PheneasMoyo, C.Yomeni, M.Boahen, S.Edet, M.Awoyale, W.Wintermantel, William M.Ling, K.S.Legg, J.P.Fei, Z.[Genome of the African cassava whitefly Bemisia tabaci and distribution and genetic diversity of cassava-colonizing whiteflies in Africa]Genome of the African cassava whitefly Bemisia tabaci and distribution and genetic diversity of cassava-colonizing whiteflies in Africa

A study was carried out to assess the effect of different cassava mosaic geminiviruses (CMGs) occurring in Uganda on the growth and yield of the susceptible local cultivar ‘Ebwanateraka’. Plants infected with African cassava mosaic virus (ACMV), ‘mild’ and ‘severe’ strains of East African cassava...


Owor, B.Legg, J.P.Okao‐Okuja, G.Obonyo, R.Ogenga‐Latigo, M.W.[The effect of cassava mosaic geminiviruses on symptom severity, growth and root yield of a cassava mosaic virus diseasesusceptible cultivar in Uganda]The effect of cassava mosaic geminiviruses on symptom severity, growth and root yield of a cassava mosaic virus diseasesusceptible cultivar in Uganda

Cassava mosaic disease (CMD) is the most important constraint to cassava (Manihot esculenta) production in Africa. Since the 1990s, the importance of the disease has been greatly increased by the spread through East and Central Africa of a pandemic of unusually severe CMD (Legg, 1999), associated...


Bigirimana, S.Barumbanze, P.Obonyo, R.Legg, J.P.[First evidence for the spread of East African cassava mosaic virus Uganda (EACMVUG) and the pandemic of severe cassava mosaic disease to Burundi]First evidence for the spread of East African cassava mosaic virus Uganda (EACMVUG) and the pandemic of severe cassava mosaic disease to Burundi

The cassava mosaic geminiviruses (CMGs) isolated from cassava plants expressing mild and severe symptoms of cassava mosaic disease (CMD) in 2002 in Uganda were investigated using the polymerase chain reaction and restriction fragment length polymorphism (PCR-RFLP) molecular techniques and DNA seq...


Sseruwagi, P.Rey, M.E.C.Brown, J.K.Legg, J.P.[The cassava mosaic geminiviruses occurring in Uganda following the 1990s epidemic of severe cassava mosaic disease]The cassava mosaic geminiviruses occurring in Uganda following the 1990s epidemic of severe cassava mosaic disease
Legg, J.P.Attiogbevi Somado, EklouBarker, IanBeach, LarryCeballos, H.Cuéllar, Wilmer J.Elkhoury, WaridGerling, DanHelsen, JanHershey, Clair H.Jarvis, AndyKulakow, P.A.Kumar, LavaLorenzo, JimLynam, John K.McMahon, MatthewMaruthi, GowdaMiano, DougMtunda, KiddoNtawuruhunga, PheneasOkogbenin, EmmanuelPezo, PhembaTerry, Eugene R.Thiele, GrahamThresh, MichaelWadsworth, JonathanWalsh, SteveWinter, StephanTohme, Joseph M.Fauquet, Claude M.[A global alliance declaring war on cassava viruses in Africa]A global alliance declaring war on cassava viruses in Africa

Here, we report a method to clean cassava plants from viral infections that cause cassava mosaic and brown streak diseases in Africa. Infected plants of resistant or tolerant varieties from Malawi, Mozambique, Kenya, Tanzania and Uganda were cleaned in the UK using a combination of tissue culture...


Maruthi, M.N.Whitfield, E.C.Otti, G.Tumwegamire, SilverKanju, E.Legg, J.P.Mkamilo, G.Kawuki, R.Benesi, I.Zacarias, A.Munga, T.Mwatuni, F.Mbugua, E.[A method for generating virus-free cassava plants to combat viral disease epidemics in Africa]A method for generating virus-free cassava plants to combat viral disease epidemics in Africa

Tumwegamire, SilverKanju, E.Legg, J.P.Shirima, R.Kombo, S.Mkamilo, G.S.Mtunda, K.Sichalwe, K.Kulembeka, H.P.Ndyetabura, I.Saleh, H.Kawuki, R.Alicai, TitusAdiga, G.Benesi, I.Mhone, A.Zacarias, A.Matsimbe, S.F.Munga, T.Ateka, E.Navangi, L.Maruthi, M.N.Mwatuni, F.Ngundo, G.Mwangangi, M.Mbugua, E.Ndunguru, J.Rajabu, C.Mark, D.[Exchanging and managing in-vitro elite germplasm to combat cassava brown streak disease (CBSD) and cassava mosaic disease (CMD) in Eastern and Southern Africa]Exchanging and managing in-vitro elite germplasm to combat cassava brown streak disease (CBSD) and cassava mosaic disease (CMD) in Eastern and Southern Africa

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