2017
Fungicide Resistance of Cercospora sojina in NC Soybean Fields
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Contributor/Checkoff:
North Carolina Soybean Producers Association
Category:
Sustainable Production
Keywords:
Crop protectionDiseaseField management
Parent Project:
This is the first year of this project.
Lead Principal Investigator:
Lindsay Thiessen, North Carolina State University
Co-Principal Investigators:
Project Code:
17-083
Contributing Organization (Checkoff):
North Carolina Soybean Producers Association
$14,310
Institution Funded:
North Carolina State University
$14,310
Brief Project Summary:

Frogeye leaf spot, caused by Cercospora sojina, damages soybeans in hot, humid U.S. climates Fungicides are a major tool for managing this challenge, particularly the quinone outside inhibitors (QoI) fungicides like azoxystrobin and pyraclostrobin. QoI fungicides are high risk for fungicide resistance due to the single site mode of action. This research provides information regarding the level fungicide resistance in C. sojina, which causes frogeye leaf spot, observed in North Carolina. Efforts seek to determine the level of fungicide resistance to QoI and DMI fungicides observed in Cercospora sojina populations collected from fields and to assess the specific genetic mutations necessary for overcoming fungicide resistance compared to the traditional fungicide plating assays.

Key Benefactors:
farmers, agronomists, extension agents

Information And Results
Final Project Results

Fungicide resistant Frogeye Leaf Spot (Cercospora sojina) is found in several soybean production regions in North Carolina. This study identified fungicide resistance in the counties assayed in 2017. The mechanism for fungicide resistance development is still poorly understood; however, the effects of resistance may be mitigated by using integrated pest management strategies. Rotation of fungicide chemistries, use of mixed modes of action, and other cultural disease management practices can reduce losses to disease like Frogeye Leaf Spot.

This trial has demonstrated that strobilurin resistant populations of Cercospora sojinaare present in North Carolina, and producers should select fungicides that utilize multiple modes of action or not utilize single FRAC 11 fungicides to avoid control failures. Additionally, this project will provide information about the mechanism for development of fungicide resistance, which may be used to prevent fungicide resistance in other fungal pests of soybean.

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.