Identification and biology of seedling pathogens of soybean
Sustainable Production
Crop protectionDiseaseField management
Lead Principal Investigator:
Jason Bond, Southern Illinois University at Carbondale
Co-Principal Investigators:
Leonor Leandro, Iowa State University
Gary Munkvold, Iowa State University
Alison Robertson, Iowa State University
Christopher Little, Kansas State University
Martin Chilvers, Michigan State University
Berlin Nelson, North Dakota State University
Albert Tenuta, Ontario Ministry of Agriculture-Food & Rural
Kiersten Wise, Purdue University
Ahmad Fakhoury, Southern Illinois University
Anne Dorrance, The Ohio State University
John Rupe, University of Arkansas
Carl Bradley, University of Kentucky
James Kurle, University of Minnesota
Dean Malvick, University of Minnesota
Loren Giesler, University of Nebraska
Heather Kelly, University of Tennessee-Institute of Agriculture
+15 More
Project Code:
Contributing Organization (Checkoff):
Institution Funded:
Brief Project Summary:

Soybean pathogens have been shown to cause seedling diseases which result in poor stands, weak plants and reduced seed yields. In the U.S., seedling diseases are reducing soybean yield by 829,000 tons, annually. This continuing project is addressing these production constraints by identifying the causal agents of seedling disease, developing new tools for rapid diagnosis, developing new protocols for research and for germplasm screening assays, and developing management recommendations for producers and the industry.

Over 3,000 pathogenic and beneficial isolates were identified over a 3-year survey. This information guided researchers to develop a quick molecular identification tool...

Unique Keywords:
#soybean diseases, #soybean seeding diseases
Information And Results
Project Deliverables

Final Project Results


Soilborne pathogens and other organisms are being identified from samples collected in 2013. This information plus the species identified in 2012 are guiding the researchers to develop a quick molecular identification tool that will be available to the industry. Many species of Fusarium, Rhizoctonia, Phytophthora, and Pythium are being evaluated for the ability to cause disease. For several pathogens environmental conditions and cropping practices were identified that increase or decrease disease severity. Researchers are perfecting techniques to isolate organisms, inoculation assays and identifying better inoculum carriers. Several methods are working very well. The goal of these efforts is to develop protocols for soybean germplasm screening. In one example, results from field trials for Rhizoctonia solani are being used to develop greenhouse assays that will allow researchers to develop mapping populations so resistance genes can be found in the future.

Baselines fungicide sensitivities were established to determine if pathogens are developing resistance to fungicides over time. Researchers in this project are finding species of Fusarium and Pythium that are not sensitive to major fungicides. Researchers also found that a range of temperatures can affect Pythium species, allowing them to be less sensitive to fungicides.

This project has led to increased communication and coordination among universities and has enabled this team to make significant progress. Extension and outreach efforts are well underway, and will delivery new and innovative educational videos and other media.

The United Soybean Research Retention policy will display final reports with the project once completed but working files will be purged after three years. And financial information after seven years. All pertinent information is in the final report or if you want more information, please contact the project lead at your state soybean organization or principal investigator listed on the project.