2014
Identification and Biology of Seedling Pathogens of Soybean (Year 3 of 2267)
Contributor/Checkoff:
Category:
Sustainable Production
Keywords:
(none assigned)
Lead Principal Investigator:
Ed Anderson, Iowa Soybean Association
Co-Principal Investigators:
Leonor Leandro, Iowa State University
Gary Munkvold, Iowa State University
Alison Robertson, Iowa State University
Douglas Jardine, Kansas 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
Jason Bond, Southern Illinois University at Carbondale
Craig Rothrock, University of Arkansas
John Rupe, University of Arkansas
Carl Bradley, University of Kentucky
James Kurle, University of Minnesota
Dean Malvick, University of Minnesota
Grover Shannon, University of Missouri
Loren Giesler, University of Nebraska
Heather Kelly, University of Tennessee-Institute of Agriculture
+18 More
Project Code:
1420-532-5667
Contributing Organization (Checkoff):
Institution Funded:
Brief Project Summary:

Unique Keywords:
#breeding & genetics, #soybean seedling diseases
Information And Results
Project Deliverables

• Identification of the different fungal species that cause seedling diseases and root rot of soybean. There is a huge demand for this information in the industry. The seed and seed treatment companies want to know what pathogens are most commonly found and which cause the most severe disease so the can appropriately target with chemicals and/or resistant varieties.
• Determining the relative importance of these fungal species in the different soybean growing regions and how the aggressiveness of these pathogens is affected by environmental conditions.
• Completion of the collection of characterized isolates of pathogens that cause seedling diseases. This collection will help to validate the use of culture-independent techniques to generate profiles of pathogens inhabiting soils and soybean seedlings from fields with high incidence of seedling diseases.
• Identification of field conditions (moisture, temperature and chemical properties) that favor seedling diseases.
• Diagnostic tools that will aid in diagnosing problem fields and aid other research endeavors by public and private researchers.
• Development of management strategies and to assess current production practices as they relate to seedling diseases.
• Establishment of efficient inoculation and disease assessment protocols.
• Development of a national extension publication on identification and management of seedling diseases. This will be available as a traditional fact sheet, and digitally as an ebook that combines audio and video.

Final Project Results

1. A major review meeting of the USDA/CAP oomycete project was held March 2014 and results were communicated including those researchers on this Seedling Disease project where there are mutual objectives. A promised report detailing the coordination between these two groups is forthcoming.
2. The collection and survey among 12 states for fungal pathogens that cause seedling blight has been completed, in conjunction with significant leveraging with a USDA Oomycte CAP project.
Of the nearly 100 different species collected, 13 appear to be pathogenic (really cause disease), some of which were previously unrecognized as a cause of seedling blight. Each of the 13 pathogens varies in their effect according to geographic region, which may have bearing how future seed treatments are designed.
3. As part of the above survey, diagnostic tools have been developed for each of the 13 pathogenic species to identify them in infected soybean plants.
4. Procedures are being developed to create inoculum that can be used in a variety screening program.
5. Outreach programs have been developed from the lessons learned above and shared in over 50 extension programs in 2014 in 8 Midwest states. Also, a fungicide (seed treatment) efficacy table has been put together for public use.
6. Milestones were reached beyond those listed as their 5 KPIs:
• Fusarium tricinctum confirmed as a pathogen of soybean.
• 15 lines identified showing partial resistance to Rhizoctonia solani
• The range of soil temperature and soil pH levels that are most favorable for several species of Fusarium and Pythium were determined – as indicator of the type of environment or habitat they favor.

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.