Fungicide Trials

The major goal of this trial is to test the effectiveness of current, farmer-implemented fungicide applications in managing foliar fungal diseases and for increasing soybean yield.

Fungicide Trial Background Information:

Disease management decisions in soybean often require the question of whether or not a well-timed fungicide application will result in yield gains, especially in the absence of disease. These management decisions are often made quickly and do not always follow in field disease scouting to determine disease pressure. Understanding how and when to make disease management decisions is a critical first step to reducing the development of fungicide-resistant pathogens and to increasing yield potential.

Each fungicide trial is custom designed to work within the individual farmer’s designated field using their own equipment to plant, spray, and harvest the treatment strips in their field. Each farmer chooses the variety of soybean to be planted and the fungicide type to be sprayed. Each field is laid out with a minimum of five fungicide sprayed strips and five strips not sprayed with fungicide. The width of the strips are designed to accommodate the individual size of the farmer’s own equipment.

In the example below, the green strips were sprayed with fungicide. The blue points are where the field was scouted for foliar disease.

Example of fungicide Trial Layout

To document differences in disease between the treatment strips, scouting for foliar diseases was performed at several locations within each treatment strip prior to and approximately two weeks following the fungicide application at the R3 stage. In addition, aerial imagery was taken at each of the scouting points to visually document the differences.


Data Summary for 2018 Fungicide Trials

In 2018, 11 fungicide trials were initiated in 11 Missouri Counties. The following tables summarizes the 2018 fungicide trial data.

Table 1. Summary of yield results from the 2018 fungicide strip trials.


Table 2. Summary of disease rating results from the 2018 fungicide strip trials.


Table 3. Background information for the 2018 fungicide trial locations.


Summary Reports for 2018 Fungicide Trial locations:

Summary Reports for 2018 Fungicide Trial locations:

1. Ralls County 5. Nodaway County   9. Atchison County
2. Barton County 6. Warren County 10. Marion County
3. Polk County 7. Scott County 11. Lincoln County
4. St. Clair County 8. Perry County

Maps of Fungicide Trial Locations:

Below is a map showing the locations of the 11 fungicide strip trials in 2018.

Map of 2018 Fungicide Trials