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Controlling Palmer Amaranth in Soybean

AUTHOR
Eric P. Prostko
Extension Weed Specialist
Department of Crop and Soil Sciences
University of Georgia

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TABLE OF CONTENTS
  1. Controlling Palmer Amaranth in Soybean
  2. Prostko's Picks for Pigweed
  3. Palmer Amaranth Facts
  4. Drought
  5. May Rainfall - CPES Tifton
  6. Soybean Irrigation in Georgia
  7. Start Clean!! Tillage/Cover Crops/Herbicides
  8. Burndown Options for Reduced Tillage Soybean Production Systems
  9. Palmer Amaranth Control with Gramoxone Inteon 2SL
  10. Residual Herbicides
  11. Why metribuzin on soybean?
  12. GR-Pigweed Control in Soybeans - 2008
  13. GR-Palmer Amaranth Control
  14. NTC vs Authority MTZ 45 DG at 12 oz/A
  15. Metribuzin Headaches
  16. Metribuzin Crop Rotations
  17. Metribuzin Soybean Tolerance
  18. GR-Palmer Amaranth Control in Soybeans with PRE's
  19. GR-Palmer Amaranth Control in Soybeans with PRE's
  20. GR-Palmer Amaranth Control in Soybeans with PRE's
  21. GR-Palmer Amaranth Control in Soybeans -- 2009
  22. Postemergence
  23. This is what a 2" pigweed looks like!!
  24. Palmer Amaranth Control with Ultra Blazer and Cobra -- 2008
  25. PPO Injury
  26. Liberty-Link Soybeans
  27. Liberty-Link Soybeans - 2009
  28. Liberty-Link Soybean Variety Performance -- 2009
  29. Harmony GT XP or Harmony SG
  30. GR-Palmer Amaranth Control with Flexstar GT
  31. On the Horizon
  32. GR-Palmer Amaranth Control in Soybeans with PRE's (2008)
  33. DHT Soybeans
  34. We are overusing the PPO inhibiting herbicides!!!
  35. Could this happen in SE?
  36. PPO-Resistant Waterhemp
  37. Prostko's Picks for Pigweed
  38. For More Weed Science Info -- www.gaweed.com



SLIDE CONTENTS
  1. Controlling Palmer Amaranth in Soybean Eric P. Prostko Associate Professor and Extension Weed Specialist Department of Crop & Soil Sciences The University of Georgia
  2. Prostko’s Picks for Pigweed Know your enemy! Drill a well! Start Clean! Use a residual! POST treatments when 3” tall or less Remove escapes before seed production Think About the Future Overuse of PPO’s
  3. Palmer Amaranth Facts (Amaranthus palmeri) grows faster than other pigweeds (1-2” per day!!) more competitive than other pigweeds 1 plant/row meter = 33% soybean yield loss prolific seed producer 400,000+/plant Most emerges from 1” or less! Pollen can move at least 900’! Seed do not last very long in soil!
  5. May Rainfall – CPES Tifton 1996-2009 8/14 years (57%) less than average rainfall!!
  6. Soybean Irrigation in Georgia Source: Kerry Harrison, UGA Extension Engineer 23.2%
  7. Start Clean!!!!!! Tillage/Cover Crops/ Herbicides
  8. Burndown Options for Reduced Tillage Soybean Production Systems Primary Glyphosate Gramoxone Inteon/ Firestorm/Parazone Ignite Tank-mixes 2,4-D (7-15 DBP) Aim (0 DBP) ET (0 DBP) Valor (0 DBP) Harmony Extra (14 DBP) Express (14 DBP) Clarity/Vision (14 DBP + 1” rainfall) FirstShot (7-14 DBP) Sharpen (30 DBP) DBP = days before planting
  9. Palmer Amaranth Control with Gramoxone Inteon 2SL @ 2.5 pt/A + 80/20 @ 0.25% v/v AMAPA Height Low = 8” High = 23” Average = 17”
  10. Residual Herbicides Treflan, Prowl Dual, Intrro (Lasso) Pursuit, Scepter Metribuzin Products** Authority MTZ, Boundary, Canopy, Sencor/Metri Valor, Valor XLT, Reflex, Envive, Prefix
  11. Why metribuzin on soybean? Not a PPO Good on pigweed Can be applied PPI Issues soil texture, OM, pH Varieties Rotations Company support Lack of incentive at dealer level Cost/A TriCor 75DF Metribuzin 75DF
  12. GR-Pigweed Control in Soybeans - 2008 SB-06-08 Macon County 48 DAP NTC Canopy 75DG @ 6 oz/A + Prowl H2O 3.8ASC @ 2.1 pt/A (PRE)
  13. GR-Palmer Amaranth Control Macon County - 2009 NTC Boundary 6.5EC @ 1.75 pt/A (PRE) Roundup W-Max 5.5SL @ 28 oz/A (36 DAP) SB-06-09 65 DAP
  14. NTC Authority MTZ 45DG @ 12 oz/A PRE (49 DAT) SB-12-09 Attapulgus
  15. Metribuzin Headaches Soil texture, OM Metribuzin should not be used on sands, loamy sands, and sandy loams with less than 1% OM! pH Varieties Rotations
  16. Metribuzin Crop Rotations *not for use on sands, loamy sands, or sandy loams with less than 1% OM.
  17. Metribuzin Soybean Tolerance Group IV: Asgrow 4903 RR/STS, Southern States RT4808 Group V: Asgrow 5905RR, AGS 568RR, Delta Pineland DP5634, Pioneer 95Y20, Pioneer 95Y40, Pioneer 95Y70, Southern States RT5951NRR Group VI: Asgrow 6301RR, Delta Pineland DP6568, Pioneer 96M60, Southern States RT 6451NRR, Vigoro V61N9 Group VII: AGS 758RR, Asgrow H7242, Benning, Dekalb H7242, Northrup King NKS 76L9, Northrup King NKS 78G6, Pioneer 97M50, USG 7732nRR, Vigoro V74N9, Woodruff Group VIII: Northrup King NKS 80P2, Prichard RR
  18. GR-Palmer Amaranth Control in Soybeans with PRE’s (2008) - Macon Co. NTC Dual Magnum 7.64EC @ 1 pt/A SB-05-08 48 DAT
  19. GR-Palmer Amaranth Control in Soybeans with PRE’s (2008) - Macon Co. NTC Prefix 5.29EC @ 2 pt/A SB-05-08 48 DAT
  20. GR-Palmer Amaranth Control in Soybeans with PRE’s (2008) - Macon Co. NTC Envive 41.3WG @ 3 oz/A SB-05-08 48 DAT
  21. GR-Palmer Amaranth Control in Soybeans – 2009 (Macon Co.) NTC Valor @ 3 oz/A (PRE) Roundup W-Max @ 22 oz/A (POST) SB-09-09 46 DAP
  22. Postemergence PPO’s Ultra Blazer, Cobra, Storm, ET, Aim, Reflex, Prefix, Flexstar GT (RR), Cadet ALS Harmony SG, Pursuit Other Ignite (LL) Must be applied before 3”!!!!!
  23. This is what a 2” pigweed looks like!!!!
  24. Palmer Amaranth Control with Ultra Blazer and Cobra - 2008 NTC Ultra Blazer @ 1.5 pt/A LI-700 @ 0.25% v/v Treatments applied to 2-10” tall pigweed , 6.23” average height Photo 16 DAT Cobra @ 12.5 oz/A Peptoil @ 1% v/v
  25. PPO Injury
  26. Liberty-Link Soybeans Not necessarily a direct replacement for Roundup! Use a residual herbicide in this system!!!!!!! Not usually good on pigweed bigger than 3” Tank-mixes with POST grass herbicides may reduce grass control Assure (10-21%); Fusilade (8-12%); Poast (25-41%); Select 4-22%) Variety performance?
  27. Liberty-Link Soybeans - 2009 NTC Boundary 6.5EC @ 1.5 pt/A (PRE) Ignite 2.34SL @ 22 oz/A (19 DAP) 54 DAP Ponder Farm
  28. Liberty-Link Soybean Variety Performance – 2009 (Bu/A +/- test average) Test Rank
  29. Harmony GT XP or Harmony SG Harmony GT XP (75%) GT = grass-tank mix XP = extruded pellet 1/12 oz/A Harmony SG (50%) SG = soluble granules 1/8 oz/A 1st trifoliate until 60 days before harvest tank-mix with glyphosate ALS inhibitor up to 12” tall pigweed????? variable amounts of soybean injury Harmony - YES Harmony Extra – NO!!!
  30. GR-Palmer Amaranth Control with Flexstar GT – 65 DAP NTC Flexstar GT 3.31SL @ 3 pt/A AMS @ 2.5% v/v Appled 18 DAP
  31. On the Horizon KIH-485 DHT Soybean DowAgroScience Herbicide Tolerance Enhanced tolerance to 2,4-D Stacked with glyphosate 2013? GAT Soybean Glyphosate ALS Tolerance DuPont 2011? Dicamba Resistant Soybeans Monsanto/BASF Stacked with glyphosate 2013?
  32. GR-Palmer Amaranth Control in Soybeans with PRE’s (2008) - Macon Co. NTC KIH-485 85WG @ 4.2 oz/A SB-05-08 48 DAT
  33. DHT Soybeans
  34. We are overusing the PPO inhibiting herbicides!!!!!!!! Resistance has already been reported in other areas!!! Common waterhemp 2001 (Kansas) 2002 (Illinois) 2003 (Missouri) Common ragweed 2005 (Delaware) Wild poinsettia 2004 (Brazil)
  35. Could this happen in SE? In this 4 year rotation, we could use 16 PPO’s!!!!
  36. PPO-Resistant Waterhemp (Dr. Bryan Young, Southern Illinois Univ.)
  37. Prostko’s Picks for Pigweed Know your enemy! Drill a well! Start Clean! Use a residual! POST treatments when 3” tall or less Remove escapes before seed production Think About the Future Overuse of PPO’s
  38. For More Weed Science Info www.gaweed.com