Regional Assessment of Soybean Brown Stem Rot, Phytophthora sojae, and Heterodera glycines Using Area-Frame Sampling: Prevalence and Effects of Tillage

dc.contributor.author Workneh, F.
dc.contributor.author Tylka, G. L.
dc.contributor.author Tylka, Gregory
dc.contributor.author Yang, X. B.
dc.contributor.author Faghihi, J.
dc.contributor.author Ferris, J. M.
dc.contributor.department Plant Pathology and Microbiology
dc.date 2018-02-18T18:09:26.000
dc.date.accessioned 2020-06-30T06:22:07Z
dc.date.available 2020-06-30T06:22:07Z
dc.date.copyright Fri Jan 01 00:00:00 UTC 1999
dc.date.issued 1999-03-01
dc.description.abstract <p>The prevalence of brown stem rot (caused by <em>Phialophora gregata</em>), <em>Heterodera glycines</em>, and <em>Phytophthora sojae</em> in the north central United States was investigated during the fall of 1995 and 1996. Soybean fields were randomly selected using an area-frame sampling design in collaboration with the National Agricultural Statistics Service. Soil and soybean stem samples, along with tillage information, were collected from 1,462 fields in Illinois, Iowa, Minnesota, Missouri, and Ohio. An additional 275 soil samples collected from Indiana were assessed for <em>H. glycines</em>. For each field, the incidence and prevalence of brown stem rot was assessed in 20 soybean stem pieces. The prevalence and recovery (expressed as the percentage of leaf disks colonized) of <em>P. sojae</em> and the prevalence and population densities of <em>H. glycines</em> were determined from the soil samples. The prevalence of brown stem rot ranged from 28% in Missouri to 73% in Illinois; 68 and 72% of the fields in Minnesota and Iowa, respectively, showed symptomatic samples. The incidence of brown stem rot was greater in conservation-till than in conventional-till fields in all states except Minnesota, which had few no-till fields. <em>P. sojae</em> was detected in two-thirds of the soybean fields in Ohio and Minnesota, whereas 63, 55, and 41% of the fields in Iowa, Missouri, and Illinois, respectively, were infested with the pathogen. The recovery rates of <em>P. sojae</em> were significantly greater (<em>P</em> ≤ 0.05) in conservation-till than in conventional-till fields in all states except Iowa. <em>H. glycines</em> was detected in 83% of the soybean fields in Illinois, 74% in Iowa, 71% in Missouri, 60% in Ohio, 54% in Minnesota, and 47% in Indiana. Both the prevalence and population densities of <em>H. glycines</em> were consistently greater in tilled than in no-till fields in all states for which tillage information was available.</p>
dc.description.comments <p>This article is published as Workneh, F., Tylka, G. L., Yang, X. B., Faghihi, J., and Ferris, J. M. 1999. Regional assessment of soybean brown stem rot, Phytophthora sojae, and Heterodera glycines using area-frame sampling: Prevalence and effects of tillage. <em>Phytopathology</em> 89:204-211, doi: <a href="https://doi.org/10.1094/PHYTO.1999.89.3.204">10.1094/PHYTO.1999.89.3.204</a>. Posted with permission.</p>
dc.format.mimetype application/pdf
dc.identifier archive/lib.dr.iastate.edu/plantpath_pubs/112/
dc.identifier.articleid 1121
dc.identifier.contextkey 10492387
dc.identifier.s3bucket isulib-bepress-aws-west
dc.identifier.submissionpath plantpath_pubs/112
dc.identifier.uri https://dr.lib.iastate.edu/handle/20.500.12876/57555
dc.language.iso en
dc.source.bitstream archive/lib.dr.iastate.edu/plantpath_pubs/112/1999_Tylka_RegionalAssessment.pdf|||Fri Jan 14 18:44:53 UTC 2022
dc.source.uri 10.1094/PHYTO.1999.89.3.204
dc.subject.disciplines Agricultural Science
dc.subject.disciplines Agriculture
dc.subject.disciplines Agronomy and Crop Sciences
dc.subject.disciplines Entomology
dc.subject.disciplines Plant Pathology
dc.subject.keywords bioassay
dc.subject.keywords minimum-till
dc.subject.keywords Phytophthora root and stem rot
dc.subject.keywords soybean cyst nematode
dc.subject.keywords tillage practices
dc.title Regional Assessment of Soybean Brown Stem Rot, Phytophthora sojae, and Heterodera glycines Using Area-Frame Sampling: Prevalence and Effects of Tillage
dc.type article
dc.type.genre article
dspace.entity.type Publication
relation.isAuthorOfPublication 1113743f-89dc-4805-8212-529b30642102
relation.isOrgUnitOfPublication a26b5928-54bb-4a0b-a973-95d649d1ad83
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