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    Spatial analysis of temporal changes in the pandemic of severe cassava mosaic disease in Northwestern Tanzania

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    phyto-03-17-0105-fi.pdf (2.900Mb)
    Date
    2017-10
    Author
    Szyniszewska, A.M.
    Busungu, C.
    Boni, S.B.
    Shirima, R.
    Bouwmeester, H.J.
    Legg, J.P.
    Type
    Journal Article
    Target Audience
    Scientists
    Metadata
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    Abstract/Description
    To improve understanding of the dynamics of the cassava mosaic disease (CMD) pandemic front, geospatial approaches were applied to the analysis of 3 years’ data obtained from a 2-by-2° (approximately 222-by-222 km) area of northwestern Tanzania. In total, 80 farmers’ fields were assessed in each of 2009, 2010, and 2011, with 20 evenly distributed fields per 1-by-1° quadrant. CMD-associated variables (CMD incidence, CMD severity, vector-borne CMD infection, and vector abundance) increased in magnitude from 2009 to 2010 but showed little change from 2010 to 2011. Increases occurred primarily in the two westernmost quadrants of the study area. A pandemic “front” was defined by determining the values of CMD incidence and whitefly abundance where predicted disease gradients were greatest. The pandemic-associated virus (East African cassava mosaic virus-Uganda) and vector genotype (Bemisia tabaci sub-Saharan Africa 1–subgroup 1) were both present within the area bounded by the CMD incidence front but both also occurred ahead of the front. The average speed and direction of movement of the CMD incidence front (22.9 km/year; southeast) and whitefly abundance front (46.6 km/year; southeast) were calculated, and production losses due to CMD were estimated to range from US$4.3 million to 12.2 million.
    http://dx.doi.org/10.1094/phyto-03-17-0105-fi
    Multi standard citation
    Permanent link to this item
    https://hdl.handle.net/20.500.12478/2126
    Digital Object Identifier (DOI)
    http://dx.doi.org/10.1094/phyto-03-17-0105-fi
    IITA Subjects
    Cassava; Climate Change; Plant Diseases
    Agrovoc Terms
    African Cassava Mosaic Virus; Diseases; Cassava; Food Security; Pandemic; Spatial Analysis; Geospatial
    Regions
    Africa; East Africa
    Countries
    Tanzania
    Journals
    Phytopathology
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    • Journal and Journal Articles5283
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