Project Details:

Gathering information on red crown rot distribution and seed treatment efficacy in Illinois

Parent Project: This is the first year of this project.
Checkoff Organization:Illinois Soybean Association
Categories:Soybean diseases, Agronomy, Crop management systems
Organization Project Code:
Project Year:2020
Lead Principal Investigator:Nathan Kleczewski (University of Illinois at Urbana-Champaign)
Co-Principal Investigators:

Contributing Organizations

Funding Institutions

Information and Results

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Project Summary

Current Situation:
Red crown rot (RCR) is a new soilborne fungal disease of soybeans in Illinois, and last year, infected fields suffered an approximate 25 bu A-1 yield loss (see supplement, ISA webinar). This disease historically has only been an issue in peanut/cotton/soybean rotations in the Deep South. RCR produces symptoms very similar to sudden death syndrome (SDS), and can be easily misidentified as SDS if not properly diagnosed. Consequently, our knowledge of the
distribution of this pathogen in Illinois is unknown as it may have been misidentified as SDS in some areas. No resistance to RCR is available in soybean cultivars. Furthermore, the efficacy of fungicide active ingredients and utility of fungicide seed treatments for managing the Illinois RCR pathogen is unknown. To date, RCR has not been detected in any other Midwest or great lakes states.

We will work with entities such as UIUC Extension, the Illinois Certified Crop Advisors, Growmark, and ISA to establish a collaborative network to survey soybeans throughout the state for RCR. Fields with interveinal chlorosis starting at the reproductive stage in growth will be targeted for sampling. Plant samples will be acquired at R5/R6 from each field, and sent to the Kleczewski lab, where they will be processed for presence of the pathogen following established protocols. A second season of the survey will be beneficial, as environmental conditions can mask disease symptoms from year to year, and fields infested with the pathogen may not be planted to soybeans during the first season. A distribution map will then be generated and published on the ISA website, the Illinois Field Crop Pathology Website, and print copies
developed and made available to clientele at outreach meetings and events.

The Kleczewski lab has 8 isolates of the RCR pathogen collected from the 2018 crop. We will screen at least 7 commonly used fungicide active ingredients for activity against these isolates in the laboratory using a poison plate assay. Each isolate x fungicide a.i. combination will be replicated at least twice and the experiment replicated twice. Data will be statistically analyzed, and shared with clientele and industry at extension outreach meetings. Data will also
be published in a peer-reviewed journal for posterity and to validate the results.

Industry representatives will be contacted and asked to provide soybean seed treatments commonly used in Illinois, as well as new or upcoming seed treatments that have not been assessed for efficacy for managing RCR. Seed treatments will be screened in the lab and greenhouse for their ability to minimize pre- and post-emergent damping off (i.e. germination) caused by the Illinois RCR pathogen. Seed treatments will also be assessed for efficacy in mitigating foliar symptoms and protecting yield using an inoculated small plot trial at the UIUC plant disease farm. Plots will be irrigated to ensure adequate wetness and infection. A second small plot experiment will be conducted near Pittsfield, Illinois in a field with a history of severe RCR. Disease and yield data will be collected. All trials will be replicated and randomized, and data statistically analyzed. As environmental conditions may not be favorable at every site every season, a second year of field trials would help ensure that sufficient disease is present to adequately justify our conclusions. Data will be summarized and published at ISA and UIUC outreach venues as described previously. At least one field day held at UIUC plant disease farm will include this project. A webinar on RCR in Illinois will be developed and presented through
ISA and UIUC, and a factsheet on RCR published in the Crop Protection Network.

Project Objectives

1. Survey Illinois soybeans for RCR to determine distribution and potential acreage affected
2. Screen isolates of RCR pathogen for sensitivity to fungicide active ingredients
3. Screen multiple commercially available soybean fungicide seed treatments for utility in managing RCR and protecting yield

Project Deliverables

One article on Red Crown Rot will be published on the Illinois soy advisor and Illinois crop production newsletter. An encyclopedia entry for RCR and its identification will be added to the Crop Protection Network for free access to producers across the Midwest. Research on RCR will be presented at at least 3 annual CCA meetings, field meetings, and extension/outreach (UIUC or ISA) meetings throughout Illinois in 2020, for example, the UIUC Agricultural Day and The Champaign Pest and Pathogen Day. Data from controlled greenhouse and lab studies will be written for publication and evaluation in peer reviewed scientific journals. At least two seasons will likely needed for field surveys and any small plot seed treatment trials in order to validate results and ensure repeatability across seasons and environments.

Progress of Work

Final Project Results

Benefit to Soybean Farmers

Optimize farmer profitability through yield and sustainable production practices: A new disease was detected in Illinois soybeans. Currently no management recommendations for this disease exist due to a lack of data on the disease and its control in the Midwest.

Leverage tools and technology to help farmers improve yield and profitability. Assessing current and “in process” fungicides and seed treatments, and assessing soybean varieties, will help producers have access to tools to manage RCR.

Build support, engagement, and recognition with producers. This project will foster collaborative efforts between ISA and UIUC, enabling synergistic opportunities to engage Illinois soybean producers and produce tangible benefits for farmers.

Opportunity: Learn about the disease and begin to develop mitigation strategies to mitigate future disease losses before they impact producer profitability in an effective, reliable, and profitable way.

Performance Metrics

`. Producers will learn how to properly identify RCR and distinguish it from similar diseases such as SDS and stem canker.
2. Producers will have data on the efficacy of variety selection and seed treatments for RCR management.
3. The initial distribution or RCR will be identified in Illinois, helping determine current risk for this disease.
4. Results of ISA funded work will be vetted and published for public access and reference
5. Spread and potential losses from RCR will be minimized in Illinois as a result of research and outreach efforts.

Project Years