title: Assessing Field-Specific Risk of Soybean Sudden Death Syndrome Using Satellite Imagery in Iowa.
abstract: Moderate resolution imaging spectroradiometer (MODIS) satellite imagery from 2004 to 2013 were used to assess the field-specific risks of soybean sudden death syndrome (SDS) caused by Fusarium virguliforme in Iowa. Fields with a high frequency of significant decrease (>10%) of the normalized difference vegetation index (NDVI) observed in late July to middle August on historical imagery were hypothetically considered as high SDS risk. These high-risk fields had higher slopes and shorter distances to flowlines, e.g., creeks and drainages, particularly in the Des Moines lobe. Field data in 2014 showed a significantly higher SDS level in the high-risk fields than fields selected without considering NDVI information. On average, low-risk fields had 10 times lower F. virguliforme soil density, determined by quantitative polymerase chain reaction, compared with other surveyed fields. Ordinal logistic regression identified positive correlations between SDS and slope, June NDVI, and May maximum temperature, but high June maximum temperature hindered SDS. A modeled SDS risk map showed a clear trend of potential disease occurrences across Iowa. Landsat imagery was analyzed similarly, to discuss the ability to utilize higher spatial resolution data. The results demonstrated the great potential of both MODIS and Landsat imagery for SDS field-specific risk assessment.
authors.affiliation: First author: School of Life Sciences, Guizhou Normal University, Guiyang, 550001, China; first, second, third, and fifth authors: Department of Plant Pathology and Microbiology, Iowa State University, Ames, IA 50011; and fourth author: Iowa Soybean Association, Ankeny, IA 50023.
authors.forename: S
authors.initials: S
authors.lastname: Yang
authors.affiliation: First author: School of Life Sciences, Guizhou Normal University, Guiyang, 550001, China; first, second, third, and fifth authors: Department of Plant Pathology and Microbiology, Iowa State University, Ames, IA 50011; and fourth author: Iowa Soybean Association, Ankeny, IA 50023.
authors.forename: X
authors.initials: X
authors.lastname: Li
authors.affiliation: First author: School of Life Sciences, Guizhou Normal University, Guiyang, 550001, China; first, second, third, and fifth authors: Department of Plant Pathology and Microbiology, Iowa State University, Ames, IA 50011; and fourth author: Iowa Soybean Association, Ankeny, IA 50023.
authors.forename: C
authors.initials: C
authors.lastname: Chen
authors.affiliation: First author: School of Life Sciences, Guizhou Normal University, Guiyang, 550001, China; first, second, third, and fifth authors: Department of Plant Pathology and Microbiology, Iowa State University, Ames, IA 50011; and fourth author: Iowa Soybean Association, Ankeny, IA 50023.
authors.forename: P
authors.identifier: http://orcid.org/0000-0001-8819-0889
authors.initials: P
authors.lastname: Kyveryga
authors.affiliation: First author: School of Life Sciences, Guizhou Normal University, Guiyang, 550001, China; first, second, third, and fifth authors: Department of Plant Pathology and Microbiology, Iowa State University, Ames, IA 50011; and fourth author: Iowa Soybean Association, Ankeny, IA 50023.
authors.forename: X B
authors.initials: XB
authors.lastname: Yang
mesh_terms: D018744:DNA, Plant; D005670:Fusarium; D007484:Iowa; D010935:Plant Diseases; D012307:Risk Factors; D013025:Glycine max; D018531:Spacecraft; D013997:Time Factors
chemical_list: D018744:DNA, Plant