2018
Seedling Diseases: Biology, Management and Education
Category:
Sustainable Production
Keywords:
Crop protectionDiseaseField management
Lead Principal Investigator:
Jason Bond, Southern Illinois University at Carbondale
Co-Principal Investigators:
Leonor Leandro, 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
Ahmad Fakhoury, Southern Illinois University
John Rupe, University of Arkansas
Kiersten Wise, University of Kentucky
Loren Giesler, University of Nebraska
Sydney Everhart, University of Nebraska at Lincoln
Heather Kelly, University of Tennessee-Institute of Agriculture
+10 More
Project Code:
NCSRP
Contributing Organization (Checkoff):
Leveraged Funding (Non-Checkoff):
USB -Seedling Diseases of Soybean: Characterization and Education (Year 2 of 3) KS Soy Com.-Soybean sudden death syndrome: Germplasm screening, ILeVO seed treatment, pathogen survival on corn residue, and pathogen variability in Kansas. KS Soy Com.-Soybean production systems to control charcoal rot and other soilborne diseases. ISA-Developing tools to protect soybean stand from seedling disease caused by Pythium species NE Soy Board-Fungicide Resistance in Rhizoctonia solani and Implications for Soybean Fields in Nebraska SDSRPC-Association of soybean cyst nematode with biotic stress factors (Fusarium and soybean aphid) and management NE Soy Board-Fungicide Resistance in Rhizoctonia solani and Implications for Soybean Fields in Nebraska USB -Seedling Diseases of Soybean: Characterization and Education (Year 3 of 3)
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Institution Funded:
Brief Project Summary:

This third year of the project will address critical limitations in identifying and managing seedling diseases. Objectives include: determining the effect of temperature, soil type/texture and pH on infection by seedling disease; characterizing the species complex associated with soybean iron chlorosis in field conditions; metagenomics analysis to improve our understanding of seedling biology and the environmental conditions that favor disease; establishing baseline inter- and intra-field variability for seedling pathogens; learning the impact of cover crops on causal agents of seedling disease; and outreach and education of findings.

Key Benefactors:
farmers, breeders, plant pathologists

Information And Results
Project Deliverables

Objective 1-2:
• Development of a QPCR panel to detect and quantify 5-10 fungal and oomycete pathogenic species.
• Optimization and validation of the panel in at least two laboratories with 3 different QPCR platforms.
• Development of standard operating procedures for the easy adoption of the panel by other users. SOP’s have been developed for the Phytophthora assays as part of the OSCAP project, these SOP’s can be adapted for additional assays.
• Maintenance of a collection of ~3,000 isolates of fungi collected from diseased soybean seedlings.
• Development and testing of long-term storage techniques for the different fungal species in the collection.
• Development and maintenance of a searchable database of collection of isolates.

Objective 3:
• Establish collection of Rhizoctonia isolates from soybean fields in underrepresented states, including new production areas towards the west.
• Determine R. solani anastomosis groups recovered from soybean seedlings and soil and identify the dominant anastomosis group.
• Determine pathogenicity of Rhizoctonia isolated from soybean fields
• Develop 1-2 additional peer-reviewed publications on fungicide sensitivity, anastomosis group diversity, and pathogenicity of Rhizoctonia. Results will also be disseminated at grower meetings, field days, crop production clinic, online in CropWatch, and other Extension publications.
• Determine if early maturity group soybean germplasms vary in response to Rhizoctonia root rot and identify those with different levels of susceptibility

Objective 4:
• Improved understanding of Fusarium species causing seedling disease on soybeans
• Identification of a resistant genotypes to more than one Fusarium species that can cause damping off and root rot.
• Improved understanding of Fusarium species from soybeans can affect corn and vice-versa; this will have influence on disease management practices (crop-rotations) in future.
• Test at least 2 common seed treatment active ingredients against a large collection of Fusarium proliferatum isolates that originate from diseased seedlings and seeds from Kansas.
• Screen 20-30 entries in MG III, MG IV, and MG V (et al.) from the Kansas State University breeding program (and other public programs) for resistance to F. proliferatum using a high-throughput rolled-towel pathogenicity assay.
• Publish at least 1 journal article reporting sensitivity of F. proliferatum to seed treatment active ingredients and/or reactions of breeding germplasm to this pathogen.

Objective 5:
• Determine fungicide sensitivity of = 250 isolates (82 species * 3 isolates per species)
• Determine fungicide sensitivity to chemistries = 2 (mefenoxam, ethaboxam)
• Screen chemistries at temperatures = 2 (55F, 75F)
• Improved understanding of Pythium-soybean interaction
o Improved understanding of the effect of cold temperatures and Pythium spp. on stand establishment of treated soybean – experiments done; manuscript in progress
o Data regarding effect of cold (<50F) temperatures at varying intervals after planting on the emergence of 2 to 3 soybean varieties that vary in resistance to Pythium -
o Data regarding effect of cold (<50F) temperatures at varying intervals after planting on seedling diseases caused by two species of Pythium
o Data regarding effect of cold (<50F) temperatures at varying intervals after planting on the efficacy of two commercial seed treatments experiments done; manuscript in progress

Objective 6:
• Improved understanding of seedling disease pathogen complex
o Data on what species are often associated in the seedling disease complex experiments done; manuscript in progress
• Improved understanding of interactions between seedling pathogens and their contribution to seedling disease
o Emergence and disease data associated with the interaction of three or more Pythium species
o Emergence and disease data associated with the interaction of three or more Fusarium species
o Emergence and disease data associated with the interaction of two or more Pythium and two or more Fusarium species experiments done; data analysis and interpretation in progress

Objective 7:
• Data will be generated to characterize the effect of 2-3 seed treatments on the population of fungal species in the rhizosphere and their ability to infect soybean plants.
• Greenhouse protocols will be developed to test the effect of 2-3 seed treatments on the collective ability of 3-4 fungal species to infect soybean seedlings.
• Results from greenhouse experiments will be compared and contrasted to those from field experiments.
• A manuscript will be prepared to publish the data learned from the research. Data will also be shared with researchers and other constituencies through presentations.

Objective 8:
• Provide high-quality Extension materials for soybean seedling diseases:
o This will include two full length publications, 3 web-based videos and 1 slide set to help farmers and agribusiness professionals to understand seedling diseases and make informed decisions on best management practices.

Final Project Results

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.