Poster # 111

Bryan Hansen ¹, Jessica Scherer ¹, Venkata Chapara ², Larissa Jennings ², Amanda Arens ², Leandro Bortolon ³, Edson Ncube ⁴, Tyler Tjelde ⁴, and Andrew Friskop ¹
1. Department of Plant Pathology, North Dakota State University, Fargo, ND 58108
2. Langdon Research Extension Center, North Dakota State University, Langdon, ND 58249
3. North Central Research Extension Center, North Dakota State University, Minot, ND 58701
4. Williston Research Extension Center, North Dakota State University, Williston, ND 58801
Corresponding Author: Bryan Hansen, bryan.hansen@ndsu.edu

Hansen, Bryan

bryan.hansen@ndsu.edu

Fungicide applications are a key component in the integrated strategies used to manage Fusarium head blight (FHB). Information pertaining to fungicide selection and timing are routinely requested by agricultural professionals when making decisions on over 7 million acres of small grains in North Dakota (ND). Uniform fungicide trials (UFT) were placed at several locations across ND to obtain local data and build into larger data summaries on fungicide performance in small grains. Throughout the UFT efforts from 2022 to 2025, a total of 23 field experiments were conducted with 9 being conducted on hard red spring wheat (HRSW), 8 on spring durum (DUR) and 6 on two-row spring barley (BAR). Research sites and the use of supplemental water varied among years and locations: Langdon (mist irrigated; 2022-2025), Fargo (dryland; 2022-2025), Davenport (dryland; 2022-2023), Minot (dryland; 2022-2025), and Nesson Valley (pivot irrigation; 2022-2025). All field experiments were conducted in a randomized complete block design with four to six replications. All plots were sown with a susceptible cultivar that has acreage relevance in ND. Disease intensity varied among environments (location by year) and data was summarized across fungicide treatments in each small grain market class for moderate to high disease environments. The FHB index, deoxynivalenol (DON), yield and test weight data were combined for common fungicide treatments that appeared in all environments and analyzed using PROC GLIMMIX. Fungicides evaluated included Prosaro® (prothioconazole + tebuconazole), Miravis® Ace (propiconazole + pydiflumetofen), Prosaro® Pro (prothioconazole + tebuconazole + fluopyram), Sphaerex® (metconazole + prothioconazole), and generic tebuconazole. Fungicide timings included Feekes 10.51/10.5 (early-anthesis HRSW or DUR / full-head BAR), 3 to 7 days after Feekes 10.51/10.5, or sequential applications of both timings. Fungicide treatments were able reduce FHB index and DON in HRSW, DUR and BAR compared to a nontreated control. Treatments that provided the most amount of FHB and DON reduction were the sequential applications beginning with Miravis Ace and followed by either Sphaerex, Prosaro Pro, or tebuconazole. With one exception, single applications of Miravs Ace, Sphaerex, Prosaro Pro performed similar to each other in reducing both FHB and DON. All fungicides protected yield in HRSW and DUR, but no yield differences were observed in BAR. The summaries created from this research provide the critical information that will be communicated through Extension events to influence input decisions made by agricultural professionals in the Northern Great Plains.

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