For Southern soybean farmers, disease presents a challenge nearly every season. Warm temperatures, high humidity and frequent rainfall often align to create ideal conditions for diseases like Cercospora leaf blight, Frogeye leaf spot and Septoria brown spot to take hold.
In the early stages of infection, the signs of disease are often not visible to the naked eye, meaning pathogens can take hold in your soybeans before you can notice. Once established, these diseases can move quickly through the canopy, putting yield at risk during key reproductive stages.
Resistance to certain fungicide chemistries, particularly FRAC Group 11 and FRAC Group 1, has become more common across the region. As a result, managing foliar disease today requires a more intentional approach, with increased emphasis on fungicide selection, multiple modes of action and season-long protection.
What to Look for in a Fungicide Program
Effective disease management begins with understanding how fungicides perform under Southern growing conditions. Products that combine multiple modes of action can provide more consistent control across varying levels of disease pressure and help manage resistant pathogens.
Revylok® fungicide combines two active ingredients, Revysol® (FRAC Group 3) and Xemium® (FRAC Group 7), and is formulated for rapid uptake into plant tissue. This combination provides activity across a broad range of foliar soybean diseases, including those with documented resistance to FRAC Group 11 and FRAC Group 1 fungicides.
“Revylok fungicide meets a critical need in the South by delivering strong, long-lasting disease control that holds up under hot, humid and unpredictable conditions,” says Kim Tutor, Technical Marketing Manager for Row Crop Fungicides with BASF. “Its residual strength helps protect yield through the season.”
Lock in ROI
Yield and return on investment drive every fungicide decision. Across multiple trials, Revylok fungicide has delivered consistent performance on both fronts.
“Revylok has shown a yield advantage of 8.2 bushels per acre over the untreated check1 and outperformed other fungicide brands by 2.4 bushels per acre,2” Tutor says.
That performance stems from agronomic strengths that make a difference in Southern production systems:
- Rapid uptake for fast-acting protection
- Strong rainfastness for reliable performance under variable rainfall
- Excellent residual activity during critical reproductive stages
- Preventative and curative activity
Plant Performance
Research shows that Revylok fungicide applications at the R2–R3 growth stages can support stronger root systems, helping soybeans better tolerate heat and moisture stress and maintain yield under challenging environmental conditions.
“Stronger root systems help soybeans maintain productivity under environmental stress,” Tutor says. “That’s especially important when heat and moisture variability can challenge yield potential.”
Putting It All Together
As disease pressure intensifies and resistance continues to shift the management landscape in the South, fungicide programs need to do more than simply react to symptoms — they need to be part of a proactive plan to protect yields.
Products like Revylok fungicide that combine multiple modes of action, consistent disease control and plant performance benefits can play an important role in protecting soybeans under Southern growing conditions. This translates into stronger yield potential and reliable return on investment.
To develop your proactive fungicide plan for 2026, contact your local retail or BASF representative.
Real Results Yield Challenge
The Real Results Yield Challenge helps farmers and retailers evaluate fungicide performance through on-farm, side-by-side comparisons. Farmers apply a BASF performance-driven fungicide, like Revylok fungicide, alongside an untreated or competitive treatment, then share in-season photos and harvest yield data.
“Whether you’ve used BASF products for years or are just considering them, the Real Results Yield Challenge invites growers to put performance to the test on their own acres,” says Tutor.
See the results for yourself this season by joining the 2026 Real Results Yield Challenge.
Sources Cited:
1 2022-2024 BASF-sponsored small-plot replicated trials (n=16). Revylok® fungicide (5.5 fl oz/A) applied with 0.25% v/v NIS at the R2.5 - R3 soybean growth stage. Trials conducted in AR, GA, KY, TN, LA, MO, MS, NC, and AL.
2 2020–2023 RevX Fields on-farm demos and BASF-sponsored university and consultant-led small-plot, replicated research trials. Revylok fungicide applied at 5.5 fl oz/A. All other fungicides applied at labeled rates. Applications to R2–R4 soybeans.
Always read and follow label directions. Revylok, Revysol and Xemium are registered trademarks of BASF. All other trademarks are the property of their respective owners and use of any such trademark does not imply any affiliation with or endorsement by its owner. ©2026 BASF Corporation. All Rights Reserved.
