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

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TABLE OF CONTENTS
  1. Peanut Response to Valor and Dual Magnum Under High Moisture Conditions
  2. Valor and Dual Magnum Use in Georgia Peanuts - 2018
  3. Valor History
  4. Brief History of Metolachlor (Dual)
  5. Objective
  6. Materials and Methods
  7. PE-67-17 – June 29 - Irrigation
  8. Rainfall/Irrigation
  9. Destructive Harvest – (19-21 DAT)
  10. Results
  11. Valor and Dual Magnum Effects on Peanut Plant Population - High Moisture Conditions - 2017
  12. Valor and Dual Magnum Effects on Peanut Plant Population - High Moisture Conditions - 2018
  13. Valor and Dual Magnum Effects on Peanut Whole Plant Biomass - High Moisture Conditions - 2017
  14. Valor and Dual Magnum Effects on Peanut Whole Plant Biomass - High Moisture Conditions - 2018
  15. Peanut J-Rooting
  16. Valor and Dual Magnum Effects on Peanut J-Rooting - High Moisture Conditions - 2017
  17. Valor and Dual Magnum Effects on Peanut J-Rooting - High Moisture Conditions - 2018
  18. Peanut Response to Valor + Dual Magnum - 2018
  19. Peanut Response to Dual Magnum - 2018
  20. Peanut Response to Dual Magnum - 2018
  21. Valor and Dual Magnum Effects on Peanut Yield - High Moisture Conditions - 2018
  22. Valor/Dual Magnum High Moisture Summary
  23. Future Research
  24. Peanut J-Rooting No Valor or Dual
  25. Questions/Comments



SLIDE CONTENTS
  1. Peanut Response to Valor and Dual Magnum Under High Moisture Conditions Eric P. Prostko, Ph.D. Professor and Extension Weed Specialist Department of Crop & Soil Sciences
  2. Valor and Dual Magnum Use in Georgia Peanuts - 2018 NASS May 2019
  3. Valor History Patent filed in 1984 First US registration 2001 Exclusive use ended 2011 Minor use extension till 2014 Generics allowed in 2015
  4. Brief History of Metolachlor (Dual) Synthesized by Ciba-Geigy in 1972 50/50% mixture of R + S isomers Registered for corn in 1977 Registered for peanut in 1980 (February) S-metolachlor registered for use in 1997 (Novartis) 12/88% mix of R + S isomers Patent expiration EPA Reduced Risk Pesticide Program Novartis stopped selling “old” metolachlor in 1999, phased out completely by 2001. Novartis + AstraZeneca became Syngenta in 2000 Generic companies started producing “old” metolachlor in 2003 (i.e. 50/50 mix of R + S isomer).
  5. Objective Evaluate peanut response to preemergence applications of Valor and Dual Magnum under high moisture conditions.
  6. Materials and Methods UGA Ponder Farm Ty Ty, GA small-plot trials 6’ X 25’ 4 replications Factorial design (3 X 4) Valor SX 51WG 0, 3, 6 oz/A Dual Magnum 7.62EC 0, 16, 21, 42 oz/A Weed-free Strongarm + Prowl H20 GA-06G (twin-row) June 28, 2017 April 30, 2018 ANOVA Tukey’s HSD (P=0.10) population, biomass, j-rooting, yield (2018)
  7. PE-67-17 – June 29 - Irrigation
  8. Rainfall/Irrigation 2017 2018
  9. Destructive Harvest – (19-21 DAT)
  10. Results
  11. Valor and Dual Magnum Effects on Peanut Plant Population - High Moisture Conditions - 2017 PE-67-17 21 DAT No interactions P = 0.5306 P = 0.4882 *averaged over 3 Dual Magnum rates **averaged over 3 Valor rates
  12. Valor and Dual Magnum Effects on Peanut Plant Population - High Moisture Conditions - 2018 PE-09-18 19 DAT No interactions P = 0.3990 P = 0.2527 *averaged over 4 Dual Magnum rates **averaged over 3 Valor rates
  13. Valor and Dual Magnum Effects on Peanut Whole Plant Biomass - High Moisture Conditions - 2017 PE-67-17 July 19 21 DAT No interactions HSD 0.10 = 0.9 HSD 0.10 = 0.7 *averaged over 3 Dual Magnum rates **averaged over 3 Valor rates
  14. Valor and Dual Magnum Effects on Peanut Whole Plant Biomass - High Moisture Conditions - 2018 PE-09-18 May 21 19 DAT No interactions HSD 0.10 = 0.4 HSD 0.10 = 0.8 *averaged over 4 Dual Magnum rates **averaged over 3 Valor rates
  15. Peanut J-Rooting
  16. Valor and Dual Magnum Effects on Peanut J-Rooting - High Moisture Conditions - 2017 PE-67-17 July 19 21 DAT No interactions P = 0.1215 P = 0.2832 *averaged over 3 Dual Magnum rates **averaged over 3 Valor rates
  17. Valor and Dual Magnum Effects on Peanut J-Rooting - High Moisture Conditions - 2018 PE-09-18 May 21 19 DAT No interactions P = 0.6510 P = 0.7086 *averaged over 4 Dual Magnum rates **averaged over 3 Valor rates
  18. Peanut Response to Valor + Dual Magnum - 2018 PE-09-18 July 24 83 DAT NTC Valor @ 3 oz/A + Dual Magnum @ 16 oz/A PRE
  19. Peanut Response to Dual Magnum - 2018 PE-09-18 July 24 83 DAT NTC Dual Magnum 7.62EC 16 oz/A PRE
  20. Peanut Response to Dual Magnum - 2018 PE-09-18 July 24 83 DAT NTC Dual Magnum 7.62EC 42 oz/A PRE
  21. Valor and Dual Magnum Effects on Peanut Yield - High Moisture Conditions - 2018 PE-09-18 Weed-free No interactions P = 0.7674 HSD 0.10 = 235 *averaged over 4 Dual Magnum rates **averaged over 3 Valor rates
  22. Valor/Dual Magnum High Moisture Summary No interactions between Valor and Dual Magnum No effect on peanut density/population No effect on peanut J-rooting Valor and Dual reduced early season peanut biomass (stunting) Valor: 3 oz/A (2.3-11.3%); 6 oz/A = (16.1-27.9%) Dual Magnum: 16 oz/A (6.3%); 21 oz/A (12.7-19.6%); 42 oz/A (22.2-28.3%) Valor @ 3 or 6 oz/A had no effect on peanut yield Dual Magnum reduced peanut yields under these high moisture conditions. 16 oz/A = 4.2% loss 21 oz/A = 5.4% loss 42 oz/A = 10.8% loss
  23. Future Research Study repeated in 2019 (8.3” in 1st 30 days) Preliminary results thus far: No interactions between Valor and Dual Magnum No effect on peanut density/population Early season biomass reduced Valor: 3 oz/A = 9%, 6 oz/A = 27% Dual Magnum: 16 oz/A = 12.5%, 21 oz/A = 16%, 42 oz/A = 25% Valor had no effect on J-Rooting Dual Magnum @ 16 or 21 oz/A had no effect on J-Rooting but @ 42 oz/A increased J-Rooting (14%+)
  24. Peanut J-Rooting No Valor or Dual PE-07-19 May 23 21 DAP
  25. Questions/Comments