The purpose of this study is to evaluate different foliar fungicides, applied at the R1 growth stage, and their impact on yield and profitability.

2018 Southern Illinois Corn Fungicide Study - Foliar

With all the fungicide options available, it can be difficult to determine which one is best for your operation. While it’s impossible to test every product, we are confident in knowing that all the fungicides that we tested in 2018 provided a strong return on investment (ROI). While scouting at the R3 growth stage only showed light infestations of gray leaf spot (GLS) in 2018, it ended up being the most prevalent corn disease at the Southern Illinois PFR site this year. Because of this late-season infection, we believe that products such as Trivapro® and Preemptor® SC edged out the other two products tested in terms of overall ROI. One of the selling points of these products is the extended period of residual protection over some other fungicides. When disease sets in later than expected, it’s a good idea to look at products that have a longer residual period, or even consider making a second fungicide application later in the season. It’s important to note that any fungicide studies in PFR do not calculate ROI based on application cost. Whether you apply fungicides aerially or by ground rig, make sure you calculate your ROI based upon your application costs.

 Fall: Vertical-Till/In-Line Rip, Spring: Vertical-Till | 

 Pre: 5.6 oz. Corvus®, 1 qt. Atrazine Post: 3 oz. Laudis®, 1 pt. Outlook®, 1 qt. Atrazine, 1 qt. Liberty® | 

 P 89, K 117, S 20, Zn 23.7, Mn 37, B 0.6

Preemptor® SC, Trivapro®, Delaro™ 325 SC, Zolera® FX

*®XL, Optimum, and AcreMax are registered trademarks of Pioneer. XL® brand seed is distributed by Beck’s Superior Hybrids, Inc.