2017
Managing frogeye leafspot of soybeans with foliar fungicides adn resistant varieties
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Contributor/Checkoff:
Kentucky Soybean Promotion Board
Category:
Sustainable Production
Keywords:
Crop protectionDiseaseField management
Parent Project:
This is the first year of this project.
Lead Principal Investigator:
Carl Bradley, University of Kentucky
Co-Principal Investigators:
Project Code:
Contributing Organization (Checkoff):
Kentucky Soybean Promotion Board
$19,868
Institution Funded:
University of Kentucky
$19,868
Brief Project Summary:

Frogeye leaf spot of soybean, caused by the fungus Cercospora sojina, is the most-damaging foliar disease of soybean that commonly occurs in Kentucky. Application of strobilurin fungicides was a common method of controlling frogeye leaf spot, but beginning in 2010, the first observations of strobilurin fungicide-resistant strains of C. sojina were documented in Kentucky and surrounding states. With the presence of these fungicide-resistant strains, management of frogeye leaf spot has become more challenging. Fortunately, soybean varieties with high levels of resistance to frogeye leaf spot are available. This research will evaluate the effect of foliar fungicides on soybean varieties that...

Unique Keywords:
#soybean diseases
Information And Results
Project Deliverables

The predicted outcome is that foliar fungicides will only provide a yield benefit to the varieties that are susceptible to frogeye leaf spot, and perhaps those that are moderately-resistant to frogeye leaf spot. For profitability purposes, yield potential of each variety will play a large role – i.e., if a susceptible variety has a larger yield potential than a resistant variety, then it could be more “profitable” to grow the susceptible variety and spray it with an effective fungicide vs. planting the resistant variety with no fungicide (or vice-versa). Since this project will rely on “natural” disease pressure and rainfall, it is possible that disease pressure could be limited in some locations. Based on the level of frogeye leaf spot severity at many of the UK Soybean Variety Performance Tests in the 2015 season, the potential for frogeye leaf spot to occur at these locations is good.

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.