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

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TABLE OF CONTENTS
  1. Impact of Dual Magnum on Peanut Yields in Georgia
  2. Brief History of Metolachlor
  3. Some Grower Perceptions
  4. Early Metolachlor/Peanut Research Results
  5. Materials and Methods
  6. Results
  7. Dual Magnum Alone
  8. Influence of PPI Dual Magnum on Peanut Yield (lbs/A) - 2011
  9. Influence of PPI Dual Magnum on Peanut Yield (lbs/A) - 2012
  10. Influence of PRE Dual Magnum on Peanut Yield (lbs/A) - 2011
  11. Influence of PRE Dual Magnum on Peanut Yield (lbs/A) - 2012
  12. Influence of PRE Dual Magnum on Peanut Yield (lbs/A) - 2012**
  13. Influence of EPOST (13-18 DAP) Dual Magnum on Peanut Yield (lbs/A) - 2011
  14. Influence of EPOST (13-15 DAP) Dual Magnum on Peanut Yield (lbs/A) - 2012
  15. Influence of POST (25-26 DAP) Dual Magnum on Peanut Yield (lbs/A) - 2011
  16. Influence of POST (30-34 DAP) Dual Magnum on Peanut Yield (lbs/A) - 2011
  17. Cadre + Dual Magnum
  18. Peanut Yield (lbs/A) Response to Cadre + Dual Magnum + 2,4-DB (2010).
  19. Influence of POST (25-26 DAP) Cadre + Dual Magnum on Peanut Yield (lbs/A) - 2011
  20. Influence of POST (30-34 DAP) Cadre + Dual Magnum on Peanut Yield (lbs/A) - 2012
  21. Gramoxone + Storm + Dual Magnum
  22. Influence of EPOST (13-18 DAP) Gramoxone (G) + Storm (S) + Dual Magnum (DM) on Peanut Yield (lbs/A) - 2011
  23. Influence of EPOST (13-15 DAP) Gramoxone (G) + Storm (S) + Dual Magnum (DM) on Peanut Yield (lbs/A) - 2012
  24. Peanut Yield Response to Gramoxone (G) + Storm (S) + Dual Magnum (DM) - 2012**
  25. A Comparison of Weed-Free Peanut Yields Between NTC and Gramoxone (12 oz/A) + Storm (16 oz/A) + Dual Magnum (16-21 oz/A) Treatments in Georgia, 2011-2012.
  26. Gramoxone + Storm + Dual Magnum (EPOST) fb Cadre + Dual Magnum (POST)
  27. Peanut Yield Response to Gramoxone (G) + Storm (S) + Dual Magnum (DM) fb Cadre (C) + Dual Magnum - 2012**
  28. Peanut Response to Gramoxone + Storm + Dual Magnum fb Cadre + Dual Magnum - 2012
  29. A Comparison of Weed-Free Peanut Yields Between NTC and Gramoxone (12 oz/A) + Storm (16 oz/A) + Dual Magnum (16 oz/A) fb Cadre (4 oz/A) + Dual Magnum (16 oz/A) Treatments in Georgia, 2012.
  30. Palmer Amaranth Control in Peanut - 2012 (Gramoxone/Dual Magnum Based Program)
  31. Summary
  32. Questions?



SLIDE CONTENTS
  1. Impact of Dual Magnum on Peanut Yields in Georgia Eric P. Prostko and Timothy L. Grey Department of Crop & Soil Sciences
  2. Brief History of Metolachlor 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).
  3. Some Grower Perceptions Under the right conditions (wet and cold) Dual can cause …….. J-rooting Delayed emergence Stand loss Yield loss
  4. Early Metolachlor/Peanut Research Results
  5. Materials and Methods 2010-2012 Replicated, small-plot research techniques 10 weed-free trials Attapulgus, Plains, Tifton (Ty Ty) GA-06G
  6. Results
  7. Dual Magnum Alone
  8. Influence of PPI Dual Magnum on Peanut Yield (lbs/A) – 2011 LSD (0.10) Tifton = 295 Plains = NS
  9. Influence of PPI Dual Magnum on Peanut Yield (lbs/A) – 2012 LSD (0.10) Tifton = NS Plains = NS
  10. Influence of PRE Dual Magnum on Peanut Yield (lbs/A) - 2011 LSD (0.10) Tifton = 295 Plains = NS
  11. Influence of PRE Dual Magnum on Peanut Yield (lbs/A) - 2012 LSD (0.10) Tifton = NS Plains = NS
  12. Influence of PRE Dual Magnum on Peanut Yield (lbs/A) – 2012** LSD (0.10) Tifton = NS Plains = NS **Averaged over 3 planting dates
  13. Influence of EPOST (13-18 DAP) Dual Magnum on Peanut Yield (lbs/A) - 2011 LSD (0.10) Tifton = 295 Plains = NS
  14. Influence of EPOST (13-15 DAP) Dual Magnum on Peanut Yield (lbs/A) - 2012 LSD (0.10) Tifton = NS Plains = NS
  15. Influence of POST (25-26 DAP) Dual Magnum on Peanut Yield (lbs/A) - 2011 LSD (0.10) Tifton = 295 Plains = NS -8.1%
  16. Influence of POST (30-34 DAP) Dual Magnum on Peanut Yield (lbs/A) - 2011 LSD (0.10) Tifton = NS Plains = NS
  17. Cadre + Dual Magnum
  18. Peanut Yield (lbs/A) Response to Cadre + Dual Magnum + 2,4-DB (2010). Cadre (C) = 4 oz/A Dual Magnum (DM) @ 16 oz/A 2,4-DB (DB) @ 18 oz/A Applied 31 DAP Weed-free Tifton PE-19-10 LSD (0.10) = NS
  19. Influence of POST (25-26 DAP) Cadre + Dual Magnum on Peanut Yield (lbs/A) - 2011 LSD (0.10) Tifton = 295 Plains = NS Cadre @ 4 oz/A + Dual Magnum @ 1.33 pt/A
  20. Influence of POST (30-34 DAP) Cadre + Dual Magnum on Peanut Yield (lbs/A) - 2012 LSD (0.10) Tifton = NS Plains = NS Cadre @ 4 oz/A + Dual Magnum @ 1.33 pt/A
  21. Gramoxone + Storm + Dual Magnum
  22. Influence of EPOST (13-18 DAP) Gramoxone (G) + Storm (S) + Dual Magnum (DM) on Peanut Yield (lbs/A) - 2011 LSD (0.10) Tifton = 295 Plains = NS -9.6% G @ 12 oz/A + S @ 16 oz/A + DM @ 1.33 pt/A
  23. Influence of EPOST (13-15 DAP) Gramoxone (G) + Storm (S) + Dual Magnum (DM) on Peanut Yield (lbs/A) - 2012 LSD (0.10) Tifton = NS Plains = NS G @ 12 oz/A + S @ 16 oz/A + DM @ 1.33 pt/A
  24. Peanut Yield Response to Gramoxone (G) + Storm (S) + Dual Magnum (DM) – 2012** PE-01-12 Attapulgus LSD 0.10 = NS CV = 15.52 **Averaged over 3 timings (11, 21, 32 DAP)
  25. A Comparison of Weed-Free Peanut Yields Between NTC and Gramoxone (12 oz/A) + Storm (16 oz/A) + Dual Magnum (16-21 oz/A) Treatments in Georgia, 2011-2012. NTC (lbs/A) G + S + DM (lbs/A) PEA01-11 PEA01-12 PE-20-11 PE-01-12 PE-17-12 n = 25
  26. Gramoxone + Storm + Dual Magnum (EPOST) fb Cadre + Dual Magnum (POST)
  27. Peanut Yield Response to Gramoxone (G) + Storm (S) + Dual Magnum (DM) fb Cadre (C) + Dual Magnum – 2012** -7.1% **G @ 12 oz/A + S @ 16 oz/A + DM @ 16 oz/A fb C @ 4 oz/A + DM @ 16 oz/A LSD (0.10) Tifton = 355 Plains = NS
  28. Peanut Response to Gramoxone + Storm + Dual Magnum fb Cadre + Dual Magnum - 2012 PE-06-12 August 22 118 DAP NTC Gramoxone SL @ 12 oz/A (13 DAP) Storm @ 16 oz/A (13 DAP) Dual Magnum @ 16 oz/A (13 DAP) Cadre @ 4 oz/A (34 DAP) Dual Magnum @ 16 oz/A (34 DAP)
  29. A Comparison of Weed-Free Peanut Yields Between NTC and Gramoxone (12 oz/A) + Storm (16 oz/A) + Dual Magnum (16 oz/A) fb Cadre (4 oz/A) + Dual Magnum (16 oz/A) Treatments in Georgia, 2012. NTC (lbs/A) G + S + DM fb C + DM (lbs/A) PE-06-12 PEA03-12 n = 8
  30. Palmer Amaranth Control in Peanut – 2012 (Gramoxone/Dual Magnum Based Program) PE-18-12 July 18 75 DAP NTC Prowl H2O @ 34 oz/A (PRE) Gramoxone SL @ 12 oz/A (21 DAP) Storm @ 16 oz/A (21 DAP) Dual Magnum @ 16 oz/A (21 DAP) Cadre @ 4 oz/A (39 DAP) Dual Magnum @ 16 oz/A (39 DAP)
  31. Summary Dual Alone (PPI, PRE, EPOST) 4/4 trials = No effect on yield Dual Alone (POST) 1/4 trials = -8.1% yield loss Cadre + Dual (POST) 5/5 trials = No effect on yield Gramoxone + Storm + Dual (EPOST) 1/5 trials = -9.6% yield loss Gramoxone + Storm + Dual fb Cadre + Dual 1/2 trials = -7.1% yield loss
  32. Questions? www.gaweed.com