Database Research Summaries
2017 Managing Soybean Diseases in Ohio

calendar_today Year of Research: 2017
update Posted On: 12/05/2019
group Anne Dorrance (Principal Investigator, The Ohio State University)
bookmark Ohio Soybean Council

Research Focus

The focus of this project is to identify the best disease management practices for Ohio’s challenging environments and changing pathogen populations.


  • Evaluate germplasm for baseline levels of soybean disease resistance to Phytophthora sojae, Sclerotinia sclerotiorum, Fusarium virguliforme (SDS), Fusarium graminearum, Cercospora sojina,Pythium irregulare, Pythium ultimum, and other Pythium spp.
  • Monitor the emergence and changing sensitivity of pathogens to common fungicides used in Ohio that cause frogeye leaf spot and Pythium seedling blight.
  • Identify mechanisms of genetic change in the primary soybean pathogen of Ohio, P. sojae, and evaluate the genetic and pathogenic diversity of Py. irregulare and Py. ultimum collected in Ohio.
  • Characterize the resistance identified in both cultivated and Korean PIs towards P. sojae, Pythium spp., and Fusarium graminearum-Identify quantitative trait loci (QTLs) and mechanisms associated with partial resistance -Identify and verify molecular markers for the putatively novel Rps genes for resistance to P. sojae that have been identified in remaining Korean PIs.
  • Identify best management practices that limit the impact of soybeans diseases for Ohio including Sclerotinia stem rot, SCN, charcoal rot, Phytophthora sojae, SDS, and Pythiumseedling diseases.


  1. Screening was done for resistance to several soybean pathogens in germplasm using lab assays. The nested association mapping (NAM) for resistance to P. sojae and Pythium spp was also screened.
  2. More than 300 isolates of Pythium and Phytophthora were recovered from the seed treatment trials and have all been identified via sequencing. Identified an emerging threat with the level of Diaporthe stem canker that developed in producer’s fields this year.
  3. This continued to be one of the most challenging seasons for field plot work on record, we did get 8 locations in Ohio this summer. Harvest is in progress of the 4291 plots plus plots.


  • This research will support the development of soybeans with resistance to key plant pathogens (Phytophthora sojae, Pythium spp., Fusarium virguliforme, Fusarium graminearum and Cercospora sojina) for Ohio and identify genes, which may be deemed as specialty traits that can be released as licensed germplasm.
  • This work is reported at scientific conferences and published where the findings can quickly be adapted by private industry.

For more information about this research project, please visit the National Soybean Checkoff Research Database.

Funded in part by the soybean checkoff.