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  1. Artikel: Expansion of the Cassava Brown Streak Disease Epidemic in Eastern Democratic Republic of Congo

    Casinga, C. M. / Shirima, R. R. / Mahungu, N. M. / Tata-Hangy, W. / Bashizi, K. B. / Munyerenkana, C. M. / Ughento, H. / Enene, J. / Sikirou, M. / Dhed’a, B. / Monde, G. / Kumar, P. L. / Legg, J. P.

    Plant disease. 2021 Aug. 20, v. 105, no. 8

    2021  

    Abstract: 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), ...

    Abstract 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.
    Schlagwörter Cassava brown streak virus ; Ugandan cassava brown streak virus ; cassava ; food security ; income ; leaves ; pandemic ; temporal variation ; viruses ; Democratic Republic of the Congo
    Sprache Englisch
    Erscheinungsverlauf 2021-0820
    Umfang p. 2177-2188.
    Erscheinungsort The American Phytopathological Society
    Dokumenttyp Artikel
    ZDB-ID 754182-x
    ISSN 0191-2917
    ISSN 0191-2917
    DOI 10.1094/PDIS-05-20-1135-RE
    Datenquelle NAL Katalog (AGRICOLA)

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  2. Artikel: Expansion of the Cassava Brown Streak Disease Epidemic in Eastern Democratic Republic of Congo.

    Casinga, C M / Shirima, R R / Mahungu, N M / Tata-Hangy, W / Bashizi, K B / Munyerenkana, C M / Ughento, H / Enene, J / Sikirou, M / Dhed'a, B / Monde, G / Kumar, P L / Legg, J P

    Plant disease

    2021  Band 105, Heft 8, Seite(n) 2177–2188

    Abstract: 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), ...

    Abstract 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 km
    Mesh-Begriff(e) Africa, Central ; Democratic Republic of the Congo/epidemiology ; Manihot ; Plant Diseases ; Plant Leaves
    Sprache Englisch
    Erscheinungsdatum 2021-08-17
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 754182-x
    ISSN 0191-2917
    ISSN 0191-2917
    DOI 10.1094/PDIS-05-20-1135-RE
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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    Verfügbar in ZB MED Bonn

    Z 2043: Hefte anzeigen

    Über subito bestellen

    Dieser Service ist kostenpflichtig (siehe Lieferbedingungen von subito). Bestellungen, die einen Artikel nebst Supplementary Material umfassen, werden grundsätzlich wie mehrfache Bestellungen bearbeitet. Gebühren fallen in diesen Fällen für jede einzelne Bestellung an.

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  3. Artikel ; Online: Diversity and distribution of whiteflies colonizing cassava in eastern Democratic Republic of Congo

    Casinga, C.M. / Wosula, E.N. / Sikirou, M. / Shirima, R.R. / Munyerenkana, C.M. / Nabahungu, N.L. / Bashizi, K.B. / Ugentho, H. / Monde, G. / Legg, James P.

    Insects

    2022  

    Abstract: The present study characterizes Bemisia tabaci and Bemisia afer from cassava in eastern Democratic Republic of Congo (DRC). The Mitochondrial COI sequencing revealed the occurrence of six cassava B. tabaci mitotypes, which were designated into four ... ...

    Abstract The present study characterizes Bemisia tabaci and Bemisia afer from cassava in eastern Democratic Republic of Congo (DRC). The Mitochondrial COI sequencing revealed the occurrence of six cassava B. tabaci mitotypes, which were designated into four haplogroups (SSA-ECA, SSA-CA, SSA2, and SSA-ESA) using KASP SNP genotyping. SSA-ECA (72%) was the most prevalent and occurred in the northern part of the surveyed area, in the Ituri and Nord/Sud-Kivu provinces, whilst SSA-CA (21%) was present in the south, primarily in Haut-Katanga. SSA-ECA was predominant in the areas of north-eastern DRC most severely affected by cassava brown streak disease and was also reported in the new outbreak area in Pweto territory, Haut-Katanga, in the south. Bemisia afer comprised two major clusters with 85.5% of samples in cluster one, while the rest were in cluster two, which has no reference sequence in GenBank. This study provides important information on the genetic diversity of B. tabaci and B. afer in eastern DRC. This knowledge will be used as a basis for further studies to understand and to identify the role of whitefly haplogroups, their population densities and consequences for virus epidemics and spread as well as leading to improved vector and virus management strategies.
    Schlagwörter cassava ; bemisia tabaci ; genetic diversity ; genotypes ; viruses ; aleyrodidae ; whiteflies
    Sprache Englisch
    Erscheinungsdatum 2022-10-06T08:21:51Z
    Verlag MDPI
    Erscheinungsland fr
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

    Volltext online

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  4. Artikel ; Online: Expansion of the cassava brown streak disease epidemic in eastern Democratic Republic of Congo

    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. Lava / Legg, James P.

    Plant Disease

    2021  

    Abstract: 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), ...

    Abstract 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.
    Schlagwörter cassava ; food security ; smallholders ; farmers ; plant diseases ; democratic republic of the congo
    Sprache Englisch
    Erscheinungsdatum 2021-12-21T11:01:55Z
    Verlag Scientific Societies
    Erscheinungsland fr
    Dokumenttyp Artikel ; Online
    Datenquelle BASE - Bielefeld Academic Search Engine (Lebenswissenschaftliche Auswahl)

    Volltext online

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