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    Expansion of the cassava brown streak disease epidemic in eastern Democratic Republic of Congo

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    Journal Article (3.595Mb)
    Date
    2021-08
    Author
    Casinga, C.M.
    Shirima, R.R.
    Mahungu, N.
    Tata-Hangy, W.
    Bashizi, K.B.
    Munyerenkana, C.M.
    Ughento, H.
    Enene, J.
    Sikirou, M.
    Dhed'a, D.B.
    Monde, G.
    Kumar, P.L.
    Legg, J.
    Type
    Journal Article
    Review Status
    Peer Review
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    Cassava plays a key role in ensuring food security and generating income for smallholder farmers throughout Central Africa, particularly in the Democratic Republic of Congo (DRC). This status is threatened, however, by cassava brown streak disease (CBSD), which has expanded its incidence and range in eastern DRC. The study described here comprises the first extensive assessment of temporal change in the occurrence of CBSD and its causal viruses in DRC, based on surveys conducted during 2016 and 2018. Cassava fields were inspected in Ituri, Nord-Kivu, Sud-Kivu, Tanganyika, and Haut-Katanga provinces within eastern DRC to record foliar incidence and severity of CBSD. Leaf samples were collected for virus detection and species-level identification. New occurrences of CBSD, confirmed by virus diagnostic tests, were recorded in two provinces (Haut-Katanga and Sud-Kivu) and nine previously unaffected territories, covering an area of >62,000 km2, and at up to 900 km from locations of previously published reports of CBSD in DRC. Overall, average CBSD incidence within fields was 13.2% in 2016 and 16.1% in 2018. In the new spread zone of Haut-Katanga, incidence increased from 1.7 to 15.9%. CBSD is now present in provinces covering 321,000 km2, which is approximately 14% of the total area of DRC. This represents a major expansion of the CBSD epidemic, which was only recorded from one province (Nord-Kivu) in 2012. Both Cassava brown streak virus (CBSV) and Ugandan cassava brown streak virus were detected in Ituri, Nord-Kivu, and Sud-Kivu, but only CBSV was detected in Haut-Katanga. Overall, these results confirm the increasing threat that CBSD poses to cassava production in DRC and describe an important expansion in the African pandemic of CBSD.
    https://dx.doi.org/10.1094/pdis-05-20-1135-re
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/7299
    IITA Authors ORCID
    Nzola Mahunguhttps://orcid.org/0000-0002-3781-0838
    P. Lava Kumarhttps://orcid.org/0000-0003-4388-6510
    James Legghttps://orcid.org/0000-0003-4140-3757
    Digital Object Identifier (DOI)
    https://dx.doi.org/10.1094/pdis-05-20-1135-re
    Research Themes
    Plant Production and Health
    IITA Subjects
    Agronomy; Cassava; Disease Control; Food Security; Plant Breeding; Plant Diseases; Plant Health; Plant Production; Smallholder Farmers
    Agrovoc Terms
    Cassava; Food Security; Smallholders; Farmers; Plant Diseases; Democratic Republic of the Congo
    Regions
    Africa; Central Africa
    Countries
    Democratic Republic of the Congo
    Hubs
    Eastern Africa Hub; Central Africa Hub; Headquarters and Western Africa Hub
    Journals
    Plant Disease
    Collections
    • Journal and Journal Articles4835
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