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  1. Article ; Online: Host associated strains within Ugandan populations of the whitefly Bemisia tabaci (Genn.), (Hom., Aleyrodidae)

    Legg, James P.

    2019  

    Abstract: Studies were undertaken to investigate host relationships of populations of Bemisiu tubuci taken from the major crop hosts in Uganda. B. tubuci adults taken from cotton and sweet potato did not colonize cassava. None survived for longer than two days and ...

    Abstract Studies were undertaken to investigate host relationships of populations of Bemisiu tubuci taken from the major crop hosts in Uganda. B. tubuci adults taken from cotton and sweet potato did not colonize cassava. None survived for longer than two days and nymphs emerging from eggs laid on cassava died. Cassava B. tubaci in contrast showed limited colonization on cotton and sweet potato and adults emerging from cotton retained the ability to colonize cassava, confirming the genetic basis of the distinction between 'strains' suggested by previous isozyme studies. The implications of these findings with regard to the role of B. tubuci in the epidemiology of African cassava mosaic geminivirus are discussed.
    Keywords morphology ; cassava ; okras ; african cassava mosaic virus ; sweet potatoes ; cotton
    Language English
    Publishing date 2019-04-24T12:29:44Z
    Publisher Wiley
    Publishing country fr
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  2. Article ; Online: Cassava in sub-Saharan Africa

    Legg, James P. / Kumar, P. Lava / Fiaboe, K.

    2023  

    Keywords food security ; cassava ; plant diseases ; plant health ; sub-saharan africa
    Language English
    Publishing date 2023-01-25T09:22:38Z
    Publisher International Society of Plant Pathology
    Publishing country fr
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Book ; Online: GLCI annual narrative progress report

    Legg, James P.

    2018  

    Keywords whitefly ; cassava viruses ; diseases
    Language English
    Publishing date 2018-04-24T08:40:27Z
    Publishing country fr
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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    Inter-library loan at ZB MED

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  4. Book ; Online: Great lake cassava initiative (GLCI) annual cassava disease and pest surveillance under the GLCI project

    Legg, James P.

    2018  

    Keywords african cassava mosaic virus ; cassava bacterial blight ; whitefly ; cassava brown streak disease
    Language English
    Publishing date 2018-04-24T08:40:27Z
    Publishing country fr
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  5. Article ; Online: Emergence, spread and strategies for controlling the pandemic of cassava mosaic virus disease in east and central Africa

    Legg, James P.

    2018  

    Abstract: During the 1990s, an epidemic of an unusually severe form of cassava mosaic virus disease (CMD) has expanded to cover virtually all of Uganda, and substantial areas in the neighbouring countries of Kenya, Tanzania, Sudan and the Democratic Republic of ... ...

    Abstract During the 1990s, an epidemic of an unusually severe form of cassava mosaic virus disease (CMD) has expanded to cover virtually all of Uganda, and substantial areas in the neighbouring countries of Kenya, Tanzania, Sudan and the Democratic Republic of Congo. Losses in the generally sensitive local cassava cultivars have been so great that a common farmer response to the problem has been the temporary abandonment of cassava cultivation. As a consequence, the CMD `pandemic' has had a significant destabilising effect on food security in East Africa. In attempting to combat the problem, vigorous efforts have been made to identify, multiply and disseminate resistant cassava germplasm. This has included cultivars obtained from the breeding programme of the International Institute of Tropical Agriculture (IITA), based in Nigeria, as well as local selections derived from IITA parent stock. Whilst considerable success has been realised in controlling the pandemic in Uganda, addressing the problem at the regional level remains a major challenge. This article reviews progress made in recent years, both in understanding the cause and mechanisms behind the pandemic's expansion, and in developing strategies to control it. Particular attention is drawn to the likely threat the pandemic poses to cassava production in the countries of central Africa, most notably the Democratic Republic of Congo, where insecurity currently impedes an assessment of the problem and the ready implementation of control measures. Scientists and other stakeholders with an interest in CMD management are therefore urged to explore innovative mechanisms that will allow them to develop a more comprehensive approach to CMD control in the region.
    Keywords african cassava mosaic virus ; bemisia tabaci ; diseases
    Language English
    Publishing date 2018-07-05T06:30:34Z
    Publishing country fr
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  6. Article ; Online: Bemisia tabaci

    Legg, James P.

    the whitefly vector of cassava mosaic geminiviruses in Africa: an ecological perspective

    2018  

    Abstract: The ecology of the Bemisia tabaci/cassava/African cassava mosaic virus (ACMV) pathosystem is reviewed briefly with special attention given to the parameters affecting the pattern of population development of B. tabaci. Significant gaps in our ... ...

    Abstract The ecology of the Bemisia tabaci/cassava/African cassava mosaic virus (ACMV) pathosystem is reviewed briefly with special attention given to the parameters affecting the pattern of population development of B. tabaci. Significant gaps in our understanding of this system remain, particularly concerning the importance of interactions of B. tabaci with other arthropod pests of cassava and the influence of ecological factors such as soil nutrients indirectly through their effects upon cassava. An holistic ecological approach to future work on B. tabaci as vector of ACMV is proposed.
    Keywords cassava ; vectors ; bemisia tabaci ; ecology ; african cassava mosaic virus
    Language English
    Publishing date 2018-09-14T07:37:47Z
    Publishing country fr
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Article ; Online: Whiteflies as vectors of plant viruses in cassava and sweet potato in Africa

    Legg, James P.

    Introduction

    2018  

    Keywords cassava ; sweet potatos ; african cassava mosaic virus ; whiteflies
    Language English
    Publishing date 2018-08-09T06:41:50Z
    Publishing country fr
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  8. Article ; Online: African cassava mosaic disease

    Legg, James P.

    2018  

    Abstract: Cassava mosaic disease (CMD), recognized in Africa for more than a century, is now known to be caused by a group of geminiviruses in the genus Begomovirus from the family Geminiviridae. All are transmitted in a persistent manner by the whitefly vector, ... ...

    Abstract Cassava mosaic disease (CMD), recognized in Africa for more than a century, is now known to be caused by a group of geminiviruses in the genus Begomovirus from the family Geminiviridae. All are transmitted in a persistent manner by the whitefly vector, Bemisia tabaci. Structurally, cassava mosaic geminiviruses (CMGs) are comprised of two small, single-stranded, circular DNA molecules, DNA-A and DNA-B, each of which is encapsidated within a geminate coat. CMG infection results in symptoms comprising misshapen leaves with a mosaic-like chlorosis and general plant stunting, leading to reduced tuberous root production. Through the processes of virus-virus synergism, pseudo-recombination and true recombination, CMGs have evolved into a diverse and highly successful group of plant pathogens and seven species are currently recognized from Africa. Rapid spread of a recombinant strain, East African cassava mosaic virus-Uganda (EACMV-UG), has been associated with a pandemic of unusually severe CMD, which has affected much of East and Central Africa, leading to production losses of 47%, equivalent to nearly 14 million tonnes. Although the deployment of conventionally-bred host plant resistance is the main approach being used to manage CMGs, with considerable success, increased attention is being given to the development of transgenic resistance strategies.
    Keywords acmv ; begomovirus ; bemisia ; cassava ; cmd ; control ; eacmv ; epidemiology ; geminivirus ; pandemic ; resistance ; transmission ; whitefly
    Language English
    Publishing date 2018-04-24T08:40:24Z
    Publisher Elsevier
    Publishing country fr
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  9. Article: Cutting Dipping Application of Flupyradifurone against Cassava Whiteflies

    Caspary, Ruben / Wosula, Everlyne N / Issa, Khamis A / Amour, Massoud / Legg, James P

    Insects

    2023  Volume 14, Issue 10

    Abstract: The cassava ... ...

    Abstract The cassava whitefly
    Language English
    Publishing date 2023-09-30
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2662247-6
    ISSN 2075-4450
    ISSN 2075-4450
    DOI 10.3390/insects14100796
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article: Evaluation of the Efficacy of Flupyradifurone against

    Issa, Khamis A / Wosula, Everlyne N / Stephano, Flora / Legg, James P

    Insects

    2022  Volume 13, Issue 10

    Abstract: A novel butenolide insecticide-flupyradifurone (Sivanto SL 200)-was evaluated for efficacy against cassava- ... ...

    Abstract A novel butenolide insecticide-flupyradifurone (Sivanto SL 200)-was evaluated for efficacy against cassava-colonizing
    Language English
    Publishing date 2022-10-12
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2662247-6
    ISSN 2075-4450
    ISSN 2075-4450
    DOI 10.3390/insects13100920
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    Order via subito

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