Soybean Seed Treatment Evaluation under Various Levels of Sudden Death Syndrome and Populations of Soybean Cyst Nematode

Sudden death syndrome (SDS), caused by <i>Fusarium virguliforme</i>, is a major yield-limiting disease of soybean in the U.S. and Canada. Field trials in 2020 and 2021 across 13 U.S. states and Ontario, Canada evaluated two SDS-targeted seed treatments and soybean cultivars - one susceptible (S) and one moderately resistant (MR) to SDS. Treatments included a base (prothioconazole+ metalaxyl + penflufen, metalaxyl, and imidacloprid), base + fluopyram, and base + pydiflumetofen. Data collection included root rot ratings, SDS foliar symptoms, and yield. Under high SDS pressure (Foliar Disease Index [FDX] ≥ 10), both SDS-targeted seed treatments and MR cultivars significantly reduced foliar symptoms (71 to 80%) compared to the base seed treatment and susceptible cultivars. Although 2020 and 2021 were not epidemic years for SDS, consistent reductions in SDS were observed. In the absence of disease, S cultivars produced greater yield than MR, but under high SDS and low soybean cyst nematode (SCN) pressure (<2,000/100 cc soil), the MR cultivars produced greater yield than the S cultivars. Only the base + pydiflumetofen treatment maintained greater yield in the absence of SDS. When SDS pressure was high (FDX ≥ 10), both SDS-targeted treatments had 7.0 to 9.0% more yield than the base. Under combined high SDS and SCN pressure (≥2,000/100 cc soi), only base + fluopyram preserved yield over the base treatment. These results provide valuable insights for future SDS management through cultivar selection and seed treatments.

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Publication Details

Journal
Plant Disease
Published
2025-11-02
DOI
https://doi.org/10.1094/pdis-05-25-1114-re
Primary Topic
Plant Pathogens and Fungal Diseases
Type
article
Field-Weighted Citation Impact
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article

Soybean Seed Treatment Evaluation under Various Levels of Sudden Death Syndrome and Populations of Soybean Cyst Nematode

Tamra A. Jackson‐Ziems, Samuel G. Markell, Rodrigo Onofre, Mandy Bish et al.
Plant Disease
Plant Pathogens and Fungal Diseases
article

Soybean Seed Treatment Evaluation under Various Levels of Sudden Death Syndrome and Populations of Soybean Cyst Nematode

Tamra A. Jackson‐Ziems, Samuel G. Markell, Rodrigo Onofre, Mandy Bish, Yuba R. Kandel, Emmanuel Byamukama, Kaitlyn Bissonnette, Adam M. Byrne, Daren S. Mueller, Eric Adee, Martin I. Chilvers, Alyssa M. Koehler, Nabin K. Dangal, Nathan M. Kleczewski, Brian Mueller, Carl A. Bradley, Albert Tenuta, Febina M. Mathew, Stith N. Wiggs, Dalitso Yabwalo, Dechun Wang, Darcy E. P. Telenko, Travis Faske, Damon L. Smith, Edward M. Ernat, Ryan Hamilton, J Scherer, Cheryl Van Herk
article en

Abstract

Sudden death syndrome (SDS), caused by <i>Fusarium virguliforme</i>, is a major yield-limiting disease of soybean in the U.S. and Canada. Field trials in 2020 and 2021 across 13 U.S. states and Ontario, Canada evaluated two SDS-targeted seed treatments and soybean cultivars - one susceptible (S) and one moderately resistant (MR) to SDS. Treatments included a base (prothioconazole+ metalaxyl + penflufen, metalaxyl, and imidacloprid), base + fluopyram, and base + pydiflumetofen. Data collection included root rot ratings, SDS foliar symptoms, and yield. Under high SDS pressure (Foliar Disease Index [FDX] ≥ 10), both SDS-targeted seed treatments and MR cultivars significantly reduced foliar symptoms (71 to 80%) compared to the base seed treatment and susceptible cultivars. Although 2020 and 2021 were not epidemic years for SDS, consistent reductions in SDS were observed. In the absence of disease, S cultivars produced greater yield than MR, but under high SDS and low soybean cyst nematode (SCN) pressure (<2,000/100 cc soil), the MR cultivars produced greater yield than the S cultivars. Only the base + pydiflumetofen treatment maintained greater yield in the absence of SDS. When SDS pressure was high (FDX ≥ 10), both SDS-targeted treatments had 7.0 to 9.0% more yield than the base. Under combined high SDS and SCN pressure (≥2,000/100 cc soi), only base + fluopyram preserved yield over the base treatment. These results provide valuable insights for future SDS management through cultivar selection and seed treatments.

Plant Disease
University of Nebraska–Lincoln (US), Ministry of Agriculture, Food and Rural Affairs (CA), University of Wisconsin–Madison (US), University of Kentucky (US), University of Illinois Urbana-Champaign (US), State Street (United States) (US), Iowa State University (US), South Dakota State University (US), Kansas State University (US), Cotton (United States) (US), Michigan United (US), Plant (United States) (US), North Carolina School of Science and Mathematics (US), North Dakota State University (US), University of Missouri (US), University of Delaware (US), Michigan State University (US)
Openalex Percentile: Top 67%
Plant Pathogens and Fungal Diseases
DOISourceOpenAlex
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