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Peanut Response to Delayed Timings of Fluridone (Brake®) and Trifludimoxazin (Rexovor®)

AUTHOR
Nicholas J. Shay
Graduate Research Assistant
University of Georgia


Eric P. Prostko
Professor and Extension Weed Specialist
University of Georgia

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TABLE OF CONTENTS
  1. Peanut Response to Delayed Timings of Fluridone (Brake®) and Trifludimoxazin (Rexovor®)
  2. Introduction: Brake® registration 2023
  3. Introduction: The case for new herbicides
  4. Introduction: The case for new herbicides
  5. Introduction: Brake®
  6. Introduction: Reasons for delayed herbicide applications
  7. Introduction: Rexovor®
  8. Objective
  9. Methods: Experimental Design
  10. Timing - 2022
  11. Timing - 2023
  12. Results: Response Variables
  13. Results: Peanut density 13 DAP following fluridone and trifludimoxazin (2022-2023)
  14. Results: Peanut stunting 13 DAP following fluridone and trifludimoxazin @ 1, 3, 5, 7 DAP (2022-2023)
  15. Results: Fluridone
  16. Results: Trifludimoxazin
  17. Results: Peanut height 30 DAP following fluridone and trifludimoxazin (2022-2023)
  18. Results: Fluridone
  19. Results: Trifludimoxazin
  20. Results: Peanut height 80 DAP following fluridone and trifludimoxazin (2022-2023)
  21. Results: Peanut yield following fluridone and trifludimoxazin (2022-2023)
  22. Conclusions
  23. Previous research & Future work
  24. Thank you



SLIDE CONTENTS
  1. Peanut Response to Delayed Timings of Fluridone (Brake®) and Trifludimoxazin (Rexovor®) Nicholas J. Shay & Eric P. Prostko Dept. Crop & Soil Sciences
  2. Introduction: Brake® registration 2023
  3. Introduction: The case for new herbicides Herbicide Use - Treated hectares USDA NASS – 2018 chemical use survey HERBICIDE RESISTANCE
  4. Introduction: The case for new herbicides
  5. Introduction: Brake® Fluridone WSSA Group # 12 Phytoene Desaturase Inhibitor Application method: PRE “Apply behind the planter (i.e. at planting) or within 36 hours after planting.”
  6. Introduction: Reasons for delayed herbicide applications Weather Equipment failures Operational/labor constraints Injury Johnson et al. 2006
  7. Introduction: Rexovor® Trifludimoxazin Rexovor® (BASF) WSSA Group # 14 Protoporphyrinogen Oxidase Inhibitor Application method: PRE Fluridone WSSA Group # 12 Phytoene Desaturase Inhibitor Application method: PRE “Apply behind the planter (i.e. at planting) or within 36 hours after planting.”
  8. Objective Evaluate peanut response to delayed timings of fluridone and trifludimoxazin. Ho: Delayed applications, regardless of timing, will have no effect on peanut density, growth, and yield.
  9. Methods: Experimental Design Experimental Period: 2022 – 2023 Location: Ponder Farm; Ty Ty, GA Dothan/Tifton sand Peanut cultivar: GA-06G RCB design; 4 replications 3x4 factorial arrangement Treatments: NTC Fluridone: 126 g ai ha-1 Trifludimoxazin: 37 g ai ha-1 Timing: 1, 3, 5, 7 DAP Data analyzed in SAS 9.4 (Cary, NC) PROC GLIMMIX Tukey-HSD (P = 0.10) Pairwise comparison
  10. Timing - 2022 1 DAP (~20 HAP) 3 DAP 5 DAP 7 DAP* *7 DAP: >50% GROUND CRACKING; 20-25% GREEN PLANT TISSUE EXPOSED.
  11. Timing - 2023 1 DAP (~20 HAP) 3 DAP 5 DAP *7 DAP: 50% GROUND CRACKING, <10% GREEN TISSUE EXPOSED. 7 DAP* 1 DAP (~20 HAP) 3 DAP
  12. Results RESPONSE VARIABLES: Density (stand) Stunting Herbicide symptomology Height Width Yield
  13. Results: Peanut density 13 DAP following fluridone and trifludimoxazin (2022-2023) P = 0.034 *Columns with letter separation are significantly different at (P < 0.1) P = 0.03 6%
  14. Results: Peanut stunting 13 DAP following fluridone and trifludimoxazin @ 1, 3, 5, 7 DAP (2022-2023) *Columns with letter separation are significantly different at (P < 0.1) P = 0.02
  15. Results: Fluridone 1 DAP 13 DAP; May 15, 2023 3 DAP 7 DAP 5 DAP NTC
  16. Results: Trifludimoxazin 1 DAP 3 DAP 7 DAP 5 DAP 13 DAP; May 15, 2023 NTC
  17. Results: Peanut height 30 DAP following fluridone and trifludimoxazin (2022-2023) P = 0.034 *Columns with letter separation are significantly different at (P < 0.1) P = 0.03
  18. Results: Fluridone NTC 30 DAP; May 31, 2023 1 DAP 7 DAP
  19. Results: Trifludimoxazin NTC 30 DAP; May 31, 2023 1 DAP 7 DAP
  20. Results: Peanut height 80 DAP following fluridone and trifludimoxazin (2022-2023) P = 0.034 P = 0.23
  21. Results: Peanut yield following fluridone and trifludimoxazin (2022-2023) P = 0.034 P = 0.88
  22. Conclusions: Density: Fluridone – slight decrease (6%) Trifludimoxazin – no effect Increased visual injury with delayed applications Plant height: 30 DAP: Fluridone = no effect; Trifludimoxazin 6% reduction 80 DAP: no effect regardless of herbicide or timing No effect on yield Overall Takeaway: Peanuts were tolerant to applications of fluridone and trifludimoxazin up to 7 DAP without negatively impacting yield.
  23. Previous research Future work: 2024 Supports previous research
  24. Thank you nicholas.shay@uga.edu Crop & Soil Sciences Acknowledgements Dr. Eric Prostko Dr. Chad Abbott Charlie Hilton Tim Richards Dewayne Dales