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Status of cassava begomoviruses and their new natural hosts in Nigeria

dc.contributor.authorOgbe, F.
dc.contributor.authorDixon, Alfred G.O.
dc.contributor.authorHughes, J.D.
dc.contributor.authorAlabi, O.J.
dc.contributor.authorOkechukwu, R.U.
dc.date.accessioned2019-12-04T11:18:06Z
dc.date.available2019-12-04T11:18:06Z
dc.date.issued2006
dc.identifier.citationOgbe, F., Dixon, A.G., Hughes, J.D., Alabi, O.J. & Okechukwu, R. (2006). Status of cassava begomoviruses and their new natural hosts in Nigeria. Plant Disease, 90(5), 548-553.
dc.identifier.urihttps://hdl.handle.net/20.500.12478/3047
dc.description.abstractA diagnostic survey was conducted in 2002-03 to determine the status of cassava mosaic begomoviruses in Nigeria and to ascertain if the virulent Ugandan variant of East African cassava mosaic virus (EACMV-Ug2) was present. Of the 418 farms visited, 48% had cassava with moderately severe or severe symptoms, whereas 52% had cassava with mild symptoms. These distributions were at random. Of the 1,397 cassava leaf samples examined, 1,106 had symptoms. In polymerase chain reaction tests, 74.1% of the symptom-bearing samples tested positive for African cassava mosaic virus (ACMV) alone, 0.3% for EACMV alone, 24.4% for mixed infections by the two viruses, and 1.2% did not react with any of the primers used. The two viruses also were detected in 32% of the 291 symptomless plants and in the whitefly vector samples. EACMV-Ug2, Indian cassava mosaic virus, and South African cassava mosaic virus were not detected in any of the whitefly or leaf samples. Most farms had ACMV in single infection as well as in mixed infections with EACMV. Most doubly infected plants showed severe symptoms. Two biological variants of ACMV were identified based on symptom expression on cassava in the field. ACMV and EACMV were detected in the leguminous plant Senna occidentalis (L.) Link and the weed Combretum confertum Lams.; these are new natural hosts of the viruses. Although the virulent EACMV-Ug2 was not detected, the occurrence of variants of ACMV and a high proportion of mixed infections by ACMV and EACMV, which could result in recombination events such as the one that produced EACMV-Ug2, demands appropriate measures to safeguard cassava production in Nigeria.
dc.description.sponsorshipGovernment of Nigeria
dc.description.sponsorshipGovernment of Nigeria
dc.description.sponsorshipOndo State Government
dc.description.sponsorshipNiger Delta Development Commission
dc.description.sponsorshipNigerian National Petroleum Corporation
dc.description.sponsorshipShell Petroleum Development Company
dc.description.sponsorshipUnited States Agency for International Development
dc.language.isoen
dc.subjectCassava Mosaic Begomoviruses
dc.subjectEast African Cassava Mosaic Virus
dc.subjectAfrican Cassava Mosaic Virus
dc.subjectWhitefly
dc.subjectSymptom
dc.titleStatus of cassava begomoviruses and their new natural hosts in Nigeria
dc.typeJournal Article
dc.description.versionPeer Review
cg.contributor.affiliationInternational Institute of Tropical Agriculture
cg.contributor.affiliationNational Root Crops Research Institute, Nigeria
cg.coverage.regionAfrica
cg.coverage.regionWest Africa
cg.coverage.countryNigeria
cg.isijournalISI Journal
cg.authorship.typesCGIAR and developing country institute
cg.iitasubjectPests Of Plants
cg.iitasubjectCassava
cg.iitasubjectPlant Genetic Resources
cg.iitasubjectResearch Method
cg.iitasubjectDisease Control
cg.iitasubjectFarm Management
cg.iitasubjectPlant Breeding
cg.iitasubjectLivelihoods
cg.iitasubjectPost-Harvesting Technology
cg.iitasubjectFarming Systems
cg.iitasubjectPlant Health
cg.iitasubjectPlant Production
cg.iitasubjectPlant Diseases
cg.accessibilitystatusOpen Access
local.dspaceid94513
cg.identifier.doihttps://dx.doi.org/10.1094/PD-90-0548


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