Integrating GPS, GIS and geostatistics for risk assessment of Bean pod mottle virus in Iowa

Use of Global Positioning Systems (GPS), Geographic Information Systems (GIS), and geostatistics are becoming powerful tools in visualizing, planning, and developing decision support models to improve the management of plant pathogens. These tools were used in mapping the prevalence and incidence of...

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Bibliographic Details
Published in:Phytopathology 2008-06, Vol.98 (6), p.S28-S28
Main Authors: Byamukama, E, Robertson, A, Nutter, FW Jr
Format: Article
Language:English
Subjects:
Bean pod mottle virus
Chrysomelidae
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Summary:Use of Global Positioning Systems (GPS), Geographic Information Systems (GIS), and geostatistics are becoming powerful tools in visualizing, planning, and developing decision support models to improve the management of plant pathogens. These tools were used in mapping the prevalence and incidence of bean pod mottle virus (BPMV) of soybean in Iowa for three growing seasons (2005-2007). The GPS coordinates for each soybean field sampled (8-20/county) were recorded prior to sampling and 30 plants/soybean field were sampled and tested for the presence of BPMV by ELISA. Field and countylevel BPMV prevalence and incidence were mapped using ArcGIS. Both BPMV prevalence and incidence data at the field and county level varied among lie three years, with 2006 having the highest prevalence of BPMV-infected fields and counties. County-level prevalence of BPMV was 39/96 counties in 2005 (40.6%), 90/99 counties (90.1%) in 2006, and 74/99 counties (74.7%) in 2007. The incidence of BPMV within counties ranged from 0 to 100%. At the county level, there was significant spatial dependence for BPMV incidence based on Moran's I analysis, indicating that counties with high BPMV incidence tended to be neighbored by counties that also had high BPMV incidence, and counties with low BPMV incidence tended to be neighbored by counties with low BPMV incidence. Krigged maps for the three years revealed greater BPMV incidence in the southern half of the state compared to the northern half. Higher incidence of BPMV in the southern Iowa was linked to high winter survival of bean leaf beetle (Ceretoma trifurcata) populations - the major vector of BPMV. The use of GPS, GIS, and geostatistics greatly improved our understanding of the geographical distribution of BPMV in Iowa and which led to the development of a conceptual model for the county-level risk factors that influence BPMV occurrence.
ISSN:0031-949X