P-123 - Getting a jump on frogeye - Foliar fungicide management for soybean yield

Monday, August 4, 2025

3:45 PM - 4:30 PM HST

Location: Exhibit Hall 3

Presenting Author(s)

MB

Meghan I. Bradburn, B.S.

North Carolina State University
Raleigh, NC, USA

Author(s)

RV

Rachel Vann

North Carolina State University
Raleigh, North Carolina, United States
SH

Shannon Holliday

North Carolina State University
Raleigh, North Carolina, United States
GT

Grace Tisone, B.S.

North Carolina State University
Raleigh, North Carolina, United States
LL

LeAnn Lux

North Carolina State University
Raleigh, North Carolina, United States

Abstract Text: Soybeans are one of the most extensively planted row crops in North Carolina (NC), with approximately 1.6 million acres planted annually. A foliar disease of soybean, Frogeye leaf spot (Cercospora sojina), is one of the most common yield-limiting foliar diseases across the United States and is frequently managed with fungicide applications. The numerous chemistries and release of new products prompt the question of efficacy across the varying fungicides. Therefore, the objective of this research was to evaluate the efficacy of several fungicides in NC. Five soybean field experiments at separate locations were conducted in a randomized complete block design with four replications in 2023 and 2024. The experiments consisted of seven treatments including a non-treated control (NTC) and were applied at growth stage R3. Data collected from each experiment consisted of yield, disease severity and weather conditions. Extremely low disease levels occurred at all locations with no statistical differences observed across all treatments. In 2023 and 2024, there were no significant differences in yield across all fungicide treatments, except in 2023 the NTC resulted in significantly lower yields (4 bu/A) compared to treatments with a fungicide application. Though no differences were found, this data gives us a baseline for understanding treatment options within a low disease pressure environment. It also emphasizes the need for continuing to investigate management strategies in regions where pressure will fluctuate year over year.