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Cassava mosaic virus disease in East Africa: a dynamic disease in a changing environment

dc.contributor.authorLegg, J.P.
dc.contributor.authorThresh, J.
dc.date.accessioned2019-12-04T11:21:06Z
dc.date.available2019-12-04T11:21:06Z
dc.date.issued2000
dc.identifier.citationLegg, J. & Thresh, J. (2000). Cassava mosaic virus disease in East Africa: a dynamic disease in a changing environment. Virus Research, 71, 135-149.
dc.identifier.issn0168-1702
dc.identifier.urihttps://hdl.handle.net/20.500.12478/3667
dc.description.abstractCassava mosaic disease (CMD), now known to be caused by cassava mosaic geminiviruses (Family Geminiviridae; Genus Begomovirus), was first reported in East Africa in 1894. Epidemics occurred in Madagascar and Uganda in the 1930s and 1940s, and more localised rapid spread of CMD was observed in parts of coastal Tanzania in the 1930s and coastal Kenya in the 1970s. During the 1990s, a major regional pandemic of an unusually severe form of CMD has expanded to affect parts of at least five countries, causing massive economic losses and destabilising food security. Mechanisms responsible for the development and progress of the pandemic have been described, and comparisons of epidemiological data for varieties grown throughout the period under review suggest that the recent pandemic has been characterised by rapid rates of CMD spread hitherto unknown in East Africa. A key factor in the genesis and spread of the pandemic has been the recombination between two distinct cassava mosaic geminiviruses to produce a novel and more virulent hybrid. Although such events may be common, the known history of CMD in East Africa suggests that the frequency with which they become epidemiologically significant is low. A corollary of this is that resistance, developed originally in Tanzania between 1934 and 1960, and utilized and supplemented at the International Institute of Tropical Agriculture, Nigeria, since 1971, is providing effective CMD control in current pandemic-affected areas of East Africa. Consequently, it is concluded that prospects for managing CMD in the 21st century are good, and that the approach adopted should build on the model of collaborative research and implementation that has been established in tackling the current CMD pandemic.
dc.language.isoen
dc.subjectCassava
dc.subjectCassava Mosaic
dc.subjectVirus Disease
dc.subjectWhitefly Vector
dc.subjectEpidemiology
dc.subjectPandemic
dc.subjectControl
dc.titleCassava mosaic virus disease in East Africa: a dynamic disease in a changing environment
dc.typeJournal Article
dc.description.versionPeer Review
cg.contributor.affiliationInternational Institute of Tropical Agriculture
cg.contributor.affiliationUniversity of Greenwich
cg.coverage.regionAfrica
cg.coverage.regionAcp
cg.coverage.regionEast Africa
cg.coverage.regionEurope
cg.coverage.countryUganda
cg.coverage.countryUnited Kingdom
cg.isijournalISI Journal
cg.authorship.typesCGIAR and advanced research institute
cg.iitasubjectCassava
cg.iitasubjectDiseases Control
cg.iitasubjectPests Of Plant
cg.iitasubjectPlant Breeding
cg.iitasubjectPlant Production
cg.iitasubjectPlant Diseases
cg.iitasubjectHandling, Transport, Storage And Protection Of Agricultural Products
cg.iitasubjectFarm Management
cg.iitasubjectLivelihoods
cg.accessibilitystatusLimited Access
local.dspaceid95822
cg.identifier.doihttps://doi.org/10.1016/S0168-1702(00)00194-5


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