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

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TABLE OF CONTENTS
  1. 2013 Peanut Weed Management Update
  2. What are we working on?
  3. Palmer Amaranth Control- Integrated Program Approach
  4. Absolutely, must start clean or you will lose!
  5. Palmer Amaranth Control in Peanut - 2012 (Valor/Strongarm Based Program)
  6. Benefits of Valor
  7. Palmer Amaranth Control in Peanut - 2012 (Dual Magnum Based Program)
  8. What do the top growers do? 2011 Georgia Peanut Achievement Club Winners
  9. Paraquat Injury
  10. What about Dual Magnum?
  11. What about Gramoxone + Storm + Dual Magnum?
  12. A Comparison of Weed-Free Peanut Yields Between NTC and Gramoxone + Storm + Dual Magnum
  13. FL-07, GA Greener, GA-07W = No problems
  14. Tank-Mixes
  15. Cadre @ 4 oz/A + Dimilin @ 4 oz/A + Bravo WS @ 24 oz/A + NIS @ 0.25% v/v - 5 DAT
  16. What happens to peanut yield when drift or sprayer contamination occurs?
  17. Estimated peanut yield loss (%) caused by glyphosate applied at 75-105 days after planting.
  18. Publication "Peanut Response to Glyphosate"
  19. Estimated Peanut Yield Losses (%) caused by dicamba (Clarity 4SL).
  20. New Publication "Peanut Response to Dicamba"
  21. Estimated Peanut Yields Losses (%) caused by glufosinate (Liberty 2.34SL)
  22. New Publication "Peanut Response to Liberty"
  23. Estimated Peanut Yield Loss (%) Caused by 2,4-D amine 3.8SL
  24. Potential New Peanut Labels
  25. Dual Magnum vs. Warrant Peanut Weed Control Programs- 2012
  26. Weed Control with Zidua - 5 WAT
  27. Final Thoughts
  28. Popular Herbicides That We Must Protect From Resistance
  29. Questions?



SLIDE CONTENTS
  1. 2013 Peanut Weed Management Update Eric P. Prostko, Ph.D. Professor and Extension Weed Specialist Department of Crop & Soil Sciences
  2. What are we working on? Palmer Amaranth Control Variety Tolerance Classic (chlorimuron) Gramoxone (paraquat) Dual Magnum (s-metolachlor) New Labels???? Warrant (acetochlor) Pyroxasulfone (KIH-485) Zidua (BASF), Fierce (Valor + Pyrox) (Valent) Drift/Sprayer Contamination Issues glyphosate, dicamba, glufosinate, 2,4-D
  3. Palmer Amaranth Control Integrated Program Approach Tillage Rye Cover Crop Twin Rows Herbicides Hand-Weeding Irrigation
  4. Absolutely, must start clean or you will lose!
  5. Palmer Amaranth Control in Peanut – 2012 (Valor/Strongarm Based Program) PE-04-12 July 18 83 DAP NTC Prowl H2O @ 34 oz/A (PRE) Valor @ 3 oz/A (PRE) Strongarm @ 0.23 oz/A (PRE) Cadre @ 4 oz/A (40 DAP) COC @ 1% v/v (40 DAP)
  6. Benefits of Valor James Jacobs Pierce Co. May 24, 2012
  7. Palmer Amaranth Control in Peanut – 2012 (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)
  8. What do the top growers do? 2011 Georgia Peanut Achievement Club Winners 10 growers 6202 lbs/A average yield 10/10- irrigated 7/10 – bottom plow 9/10 – twin rows Herbicides 8/10 – Sonalan 9/10 – Valor 3/10 – Dual 8/10 – Cadre 6/10 – 2,4-DB 3/10 – Gramoxone 2/10 – Prowl 2/10 - Strongarm
  9. Paraquat Injury Weed-free trials conducted in 2010-2012 10/10 comparisons (100%) no negative yield effects Gramoxone (+/-) Storm or Basagran Gramoxone Gramoxone + Basagran
  10. What about Dual Magnum? Weed-free trials conducted in 2010-2012 32/33 comparisons (97%) no negative yield effects PPI, PRE, EPOST, POST, Cadre + Dual
  11. What about Gramoxone + Storm + Dual Magnum? 2 DAT 4-6% yield loss in weed-free conditions
  12. 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
  13. FL-07, GA Greener, GA-07W = No problems GA-06G and Tifguard = 7-11% yield losses
  14. Tank-Mixes
  15. Cadre @ 4 oz/A + Dimilin @ 4 oz/A + Bravo WS @ 24 oz/A + NIS @ 0.25% v/v – 5 DAT
  16. What happens to peanut yield when drift or sprayer contamination occurs? glufosinate glyphosate 2,4-D dicamba
  17. Estimated peanut yield loss (%) caused by glyphosate applied at 75-105 days after planting.
  18. Publication “Peanut Response to Glyphosate” UGA Circular 1007 September 2011 http://www.caes.uga.edu/applications/publications/files/pdf/C%201007_1.PDF
  19. Estimated Peanut Yield Losses (%) caused by dicamba (Clarity 4SL).** **2 site-years in Georgia
  20. New Publication “Peanut Response to Dicamba” UGA Circular 1015, April 2012 http://www.caes.uga.edu/applications/publications/files/pdf/C%201015_1.PDF
  21. Estimated Peanut Yields Losses (%) caused by glufosinate (Liberty 2.34SL)** **GA-06G, 4 site years in Georgia (Ponder + Plains)
  22. New Publication “Peanut Response to Liberty” UGA Circular 1025, January 2013 http://www.caes.uga.edu/Publications/pubDetail.cfm?pk_id=8022
  23. Estimated Peanut Yield Loss (%) Caused by 2,4-D amine 3.8SL** **Pooled over 4 site-years in Georgia (Ty Ty, Attapulgus)
  24. Potential New Peanut Labels????? May or May Not Happen (Valor + Zidua) (pyroxasulfone)
  25. Dual Magnum vs. Warrant Peanut Weed Control Programs– 2012 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) Prowl H2O @ 34 oz/A (PRE) Gramoxone SL @ 12 oz/A (21 DAP) Storm @ 16 oz/A (21 DAP) Warrant @ 48 oz/A (21 DAP) NIS @ 0.25% v/v (21 DAP) Cadre @ 4 oz/A (39 DAP) Warrant @ 48 oz/A (39 DAP) NIS @ 0.25% v/v (39 DAP)
  26. Weed Control with Zidua – 5 WAT NTC Zidua 85 WG @ 1.5 oz/A* NC-05-11
  27. Final Thoughts Next 2-5 years Warrant Maybe Zidua??? After that????? Desperately need a new MOA!!!!! ?Selection pressure Valor, Reflex Dual, Warrant 2,4-D and dicamba resistant cotton?
  28. Popular Herbicides That We Must Protect From Resistance
  29. Questions? www.gaweed.com