Poster # 112

Isaack Kikway¹, Alyssa Collins², Alyssa Koehler³, Andrew Friskop⁴, Carl Bradley⁵, Christina Cowger⁶, Damon Smith⁷, Darcy Telenko⁸, Douglas Higgins⁹, Guy Padgett¹⁰, Heather Darby¹¹, Heather Kelly¹², Juliet M. Marshall¹³, Kelsey Andersen Onofre¹⁴, Madalyn Shires¹⁵, Mandy Bish¹⁶, Martin Chilvers¹⁷, Nidhi Rawat¹⁸, Paul Esker¹⁹, Santiago Mideros²⁰, Stephen Wegulo²¹, Pierce A Paul¹
1. The Ohio State University/OARDC, Wooster 44691
2. The Pennsylvania State University, Manheim, PA 17545
3. The University of Delaware, Georgetown, DE 19947
4. North Dakota State University, Fargo, ND 58102
5. University of Kentucky, Princeton, KY 42445
6. North Carolina State University/USDA-ARS, Raleigh, NC 27695
7. University of Wisconsin-Madison, Madison, WI 53706
8. Purdue University, West Lafayette, IN 47907
9. Virginia Tech, Suffolk, VA 23437
10. Louisiana State University Ag Center, Baton Rouge 70803
11. University of Vermont and State Agricultural College, St. Albans, VT 05478
12. The University of Tennessee at Knoxville, Jackson, TN 38301
13. University of Idaho, Aberdeen, ID 83210
14. University of Kansas State University, Manhattan, KS 66506
15. South Dakota State University, Brookings, SD 57007
16. University of Missouri, Columbia, MO 65211
17. Michigan State University, East Lansing, MI 48824
18. University of Maryland, College Park, MD 20742
19. The Pennsylvania State University, University Park, PA 16802
20. University of Illinois, Urbana, IL 61801
21. University of Nebraska-Lincoln, Lincoln, NE 6858
Corresponding Author: Pierce Paul; Email: paul.661@osu.edu

Kikway, Isaack

kikway.1@osu.edu

Fusarium head blight (FHB) and associated grain contamination with mycotoxins such as deoxynivalenol (DON) continue to be of great economic importance in many wheat-producing regions of the United States. Prosaro has historically been one of the industry standards for FHB and DON management. However, newer fungicides such as Prosaro Pro®, Sphaerex®, and Miravis Ace® are now marketed for FHB and DON management, with efficacy, based on previous uniform fungicide trials (UFT), comparable to, or in some cases, greater than Prosaro. In 2025, UFTs were again conducted in 21 US states to evaluate and compare the efficacy of the aforementioned fungicides as well as an experimental fungicide, A23751C, for FHB and DON management in the following single- and double-application treatment programs: Prosaro (I), A23751C (II), Miravis Ace (III), Prosaro Pro (IV), or Sphaerex (V) applied at anthesis, or Miravis Ace at anthesis followed by an application of Prosaro Pro (VI), Sphaerex (VII), or Tebuconazole (VIII) at 4-6 days after anthesis, plus a non-treated check (CK). FHB index (IND) was assessed, and grain samples were collected and assayed for DON. Across environments, IND and DON in the checks ranged from 0 to 53% and 0.3 to 47.1 ppm, respectively. All fungicide programs resulted in significantly (P < 0.001) lower mean IND and DON than CK. Among single-application treatments, pairwise differences in mean IND and DON contamination of grain between treatment I (Prosaro at anthesis) and the other four treatments were not statistically significant; treatment III (Miravis Ace at anthesis) resulted in significantly (P < 0.05) lower mean IND than treatments I and IV; but mean DON was not significantly different among the five single-application treatments. Two of the three sequential application fungicide programs, VI and VII, resulted in significantly (P < 0.001) lower mean IND than all single-application programs, and significantly lower mean DON than all but one (treatment II) single application programs. The efficacy of each fungicide treatment was estimated in terms of percent control (C) for IND and DON relative to CK. Across environments, sequential application programs (VI, VII and VIII) resulted in higher C values for both IND and DON compared to single-application treatments. For instance, C values for IND and DON under sequential applications ranged from 66.7% to 69.3% and 40.1% to 52.4% respectively. Among single applications, treatment III provided the highest C values for both IND (61.2%) and DON (31.7%). Double-application treatments VI and VII were the most effective overall.

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