Comparison of Baiting Techniques for Recovering Phytophthora sojae from Soybean Fields in Iowa

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2021
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Matthiesen, Rashelle
Schmidt, Clarice
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© 2021 The American Phytopathological Society
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Plant Pathology and Microbiology
The Department of Plant Pathology and Microbiology and the Department of Entomology officially merged as of September 1, 2022. The new department is known as the Department of Plant Pathology, Entomology, and Microbiology (PPEM). The overall mission of the Department is to benefit society through research, teaching, and extension activities that improve pest management and prevent disease. Collectively, the Department consists of about 100 faculty, staff, and students who are engaged in research, teaching, and extension activities that are central to the mission of the College of Agriculture and Life Sciences. The Department possesses state-of-the-art research and teaching facilities in the Advanced Research and Teaching Building and in Science II. In addition, research and extension activities are performed off-campus at the Field Extension Education Laboratory, the Horticulture Station, the Agriculture Engineering/Agronomy Farm, and several Research and Demonstration Farms located around the state. Furthermore, the Department houses the Plant and Insect Diagnostic Clinic, the Iowa Soybean Research Center, the Insect Zoo, and BugGuide. Several USDA-ARS scientists are also affiliated with the Department.
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Plant Pathology and Microbiology
Abstract
Understanding the diversity of a pathogen is important for developing disease management recommendations. In the Phytophthora root and stem rot (PRSR)-soybean pathosystem, P. sojae is characterized into pathotypes based on the ability of the pathogen to cause disease on soybean genotypes that each contain a different resistance Rps gene. To understand the diversity of P. sojae in an area, isolates of the pathogen may be recovered by baiting soil samples. In this research, we compared two commonly used methods for baiting P. sojae: the leaf disc method and the seedling method. More isolates of P. sojae were recovered using the leaf disc baiting method (P<0.01), and more pathotypes were detected within this population (P<0.01). Mean complexity of the two populations and the Simple, Gleason, and Shannon diversity indices also differed (P<0.01). However, the percent of isolates that caused disease on each Rps gene did not differ between methods. Thus, either method could be used to characterize pathotypes of P. sojae present in an area to provide data to soybean breeders and agronomists for deployment of Rps genes in soybean cultivars.
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This is a manuscript of an article published as Matthiesen, Rashelle L., Clarice Schmidt, and Alison E. Robertson. "Comparison of baiting techniques for recovering Phytophthora sojae from soybean fields in Iowa." Plant Health Progress 22 (2021): 316-322. doi:10.1094/PHP-02-21-0040-FI. Posted with permission.
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