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2021
Survey and rapid diagnostics for fungicide resistant Frogeye Leaf Spot in Nebraska
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Contributor/Checkoff:
Nebraska Soybean Board
Category:
Sustainable Production
Keywords:
Parent Project:
This is the first year of this project.
Lead Principal Investigator:
Sydney Everhart, University of Nebraska at Lincoln
Co-Principal Investigators:
Project Code:
707
Contributing Organization (Checkoff):
Nebraska Soybean Board
$73,133
Institution Funded:
University of Nebraska at Lincoln
$73,133
Brief Project Summary:
The proposed study is aimed at developing:
1) a DNA-based method to provide rapid diagnostics to identify FLS-resistance at no direct cost to growers in the next three years,
2) new information on the distribution and spread of fungicide resistant FLS in Nebraska, and
3) educational materials and outreach programs on resistance management practices.
Information And Results
Project Summary

The proposed study is aimed at developing:
1) a DNA-based method to provide rapid diagnostics to identify FLS-resistance at no direct cost to growers in the next three years,
2) new information on the distribution and spread of fungicide resistant FLS in Nebraska, and
3) educational materials and outreach programs on resistance management practices.

Project Objectives

1. Develop a DNA-based protocol for rapid identification of QoI resistant C. sojina.
2. Solicit FLS samples coming from Nebraska soybean grower fields by contacting crop consultants, commercial agronomists, and Extension educators, and use the DNA-based tool (from Obj. 1) for rapid diagnosis of FLS fungicide resistance at no cost to the grower.
3. Perform targeted follow-up sampling of selected soybean fields to be able to characterize the within-field distribution of fungicide resistance.
4. Characterize the population structure and genetic diversity of C. sojina populations (from Obj. 2 and 3) from soybean to better understand the epidemiology of resistance in Nebraska.
5. Develop/deliver educational materials and outreach programs on resistance management.

Project Deliverables

1. Develop a DNA-based protocol for rapid identification of QoI resistant C. sojina
2. Solicit FLS samples coming from Nebraska soybean grower fields by contacting crop consultants, commercial agronomists, and Extension educators, and use the DNA-based tool (from Obj. 1) for rapid diagnosis of FLS fungicide resistance at no cost to the grower
3. Perform targeted follow-up sampling of selected soybean fields to be able to characterize the within-field distribution of fungicide resistance
4. Characterize the population structure and genetic diversity of C. sojina populations (from Obj. 2 and 3) from soybean to better understand the epidemiology of resistance in Nebraska
5. Develop/deliver educational materials and outreach programs on resistance management

Progress Of Work

Final Project Results

Benefit To Soybean Farmers

In 2019, resistance to QoI fungicides was confirmed in 10 isolates of C. sojina from 10 counties in Nebraska. Fungicide resistance is a serious concern because it threatens the ability to use QoI fungicides, which are some of the most effective and widely used fungicides for managing FLS. A major limitation is that we do not presently have capacity within Nebraska for QoI resistance screening of C. sojina.
The proposed study is aimed at:
1) developing a DNA-based method to provide rapid diagnostics to identify FLS-resistance at no direct cost to growers in the next three years,
2) developing new information on the distribution and spread of fungicide resistant FLS in Nebraska, and
3) develop educational materials and outreach programs on resistance management practices.

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.