Fungicides are routinely applied at early-anthesis in North Dakota (ND) to reduce damage from Fusarium head blight (FHB) and protect yield. Given the variability in weather among growing seasons, it is important to continually update data pertaining to the use of fungicides in variable FHB environments. Seven hard red spring wheat (HRSW) uniform fungicide trials (UFT) were conducted to compare the timing and efficacy of fungicide premixes on reducing FHB incidence, severity, and index, while protecting yield and test weight. Research sites were established at the Langdon Research Extension Center (Langdon; mist irrigated; 2022-2024), North Dakota State University (Fargo; dryland; 2022-2024), and North Central Research Extension Center (Minot; dryland; 2024). Field experiments were conducted in a randomized complete block design with four replications. All plots were sown with a susceptible HRSW cultivar that is also grown on wide acreage in ND. Treatments evaluated included a non-treated control (NTC), Prosaro^® (prothioconazole + tebuconazole), Miravis^® Ace (propiconazole + pydiflumetofen), Prosaro^® Pro (prothioconazole + tebuconazole + fluopyram), Sphaerex^® (metconazole + prothioconazole), and Folicur^® (tebuconazole). Fungicide timings included Feekes 10.51 (early-anthesis), and 3 to 7 days after Feekes 10.51, or sequential applications of both timings. Six of the seven field experiments developed moderate to high levels FHB and were combined for analysis using PROC GLIMMIX. Results indicated that all fungicide treatments reduced incidence, severity and index. Single applications of Miravis Ace, Sphaerex, and Prosaro Pro had similar FHB index values to sequential application treatments. All fungicide treatments had significantly higher yield and test weight when compared to the NTC. The application of Sphaerex at 3 to 7 days after Feekes 10.51 had similar disease suppression to Sphaerex at Feekes 10.51, yet higher yield. This suggests that there may be an agronomic benefit associated with a “later” application of a fungicide to manage FHB. Results have been summarized and are available on a 360 interactive tool/website. Summarized data sets will also be presented at numerous Extension events and influence fungicide input decisions on potentially 5 to 6 million acres of HRSW.

ACKNOWLEDGEMENT AND DISCLAIMER

This material is based upon work supported by the U.S. Department of Agriculture, under Agreement No. 59-0206-2-124. This is a cooperative project with the U.S. Wheat and Barley Scab Initiative. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the authors and do not necessarily reflect the view of the U.S. Department of Agriculture.