Slide Presentation

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2011 Glyphosate-Resistant Palmer Amaranth Management in Cotton

AUTHOR
Stanley Culpepper
Professor and Extension Weed Specialist
University of Georgia

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TABLE OF CONTENTS
  1. 2011 Glyphosate-Resistant Palmer Amaranth Management in Cotton
  2. GR Pigweed in the Mid-south and Southeast
  3. Managing GR Palmer in Cotton (Southeast and MidSouth)
  4. Preplant/PRE herbicides for Palmer amaranth in Roundup Ready Cotton in SE
  5. Controlling 5 inch Glyphosate-Resistant Palmer amaranth at Burndown.
  6. Palmer control at planting, burndown applied 17 d earlier.
  7. 2 GR Weeds in the Same Field
  8. Burndown Programs for GR Horseweed/Palmer
  9. Preplant/PRE herbicides for Palmer amaranth in Roundup Ready Cotton in SE
  10. Palmer amaranth control by PRE herbicides; 40 days
  11. GR Weed Management in Cotton
  12. Controlling GR Palmer amaranth in RR cotton. 2011. SE and MS.
  13. Concept of Overlapping Residuals
  14. Concept of Overlapping Residuals
  15. Concept of Overlapping Residuals
  16. Early topical applications with residual needed before Palmer emerges in RR cotton!!
  17. Hooded Spray or Layby Rig
  18. Monsanto’s Roundup Ready Cotton Performance Roundup Ready Flex Cotton (Up to $20)
  19. Dryland Conservation Tillage
  20. Palmer response to Ignite
  21. Weed Management in Glufosinate-Tolerant Cotton
  22. 32 oz/A Gly 4 fb 29 oz/A Ignite on 12" Palmer
  23. Palmer amaranth must be small (3 to 4 inches) if consistently controlled by Ignite
  24. Controlling GR Palmer amaranth in LL conventional DRYLAND cotton.
  25. Phytogen Widestrike Cotton
  26. Phytogen Widestrike Cotton (treated with Ignite)
  27. Weed management in LL vs WRF cotton
  28. 375 WideStrike Cotton Tolerance to Multiple Applications of Ignite
  29. 375 WideStrike Cotton Tolerance to Multiple Applications of Ignite
  30. 375 WideStrike Cotton Tolerance to Multiple Applications of Ignite
  31. Photo 5 days after 2 leaf application
  32. Photo 5 days after bloom + 2 week application
  33. Can not survive with herbicides alone any longer
  34. Photo
  35. What percent Palmer amaranth control?
  36. Developing Integrated Programs
  37. Hand Weeding
  38. Hand Weeding
  39. TREFLAN/PROWL
  40. Impact of GR Palmer amaranth in Georgia counties with severe infestations.
  41. Tillage in Cotton During 2010
  42. Most Palmer amaranth emerges from top inch
  43. Number of Palmer Amaranth Plants During Early Season.
  44. GR Palmer amaranth control by tillage and cover crop residue. 2006-2010
  45. Palmer requires a significant amount of sunlight to emerge!!
  46. Photo
  47. Photo
  48. In the rye, control loss was in the strip
  49. Tons of Issues/Challenges
  50. Comments or Questions?



SLIDE CONTENTS
  1. 2011 Glyphosate-Resistant Palmer Amaranth Management in Cotton Culpepper, Steckel, York
  2. Amaranthus rudis Amaranthus palmeri Tennessee Missouri Illinois Mississippi Georgia S Carolina N Carolina Alabama Louisiana Arkansas GR Pigweed in the Mid-south and Southeast Steckel 2010
  3. Managing GR Palmer in Cotton (Southeast and MidSouth) Weed Control Systems Starting clean At-plant residuals Postemergence options Layby directed and hooded options Roundup- and Ignite-based program Building integrated programs Tillage, cover crops, etc
  4. Preplant/PRE herbicides for Palmer amaranth in Roundup Ready Cotton in SE Preplant PRE Valor Direx
  5. Controlling 5 inch Glyphosate-Resistant Palmer amaranth at Burndown. Macon Co., GA 2008.* 0 c 87 b 94 a 58 b Roundup Firestorm 2 pt 70 b Firestorm + 2,4-D (1.5 pt) Firestorm + Clarity (8 oz) Firestorm + Diuron (1.8 pt) *COC included with all Firestorm treatments
  6. Palmer control at planting, burndown applied 17 d earlier. Macon Co., GA 2009. 90 b Valor preplant Direx preplant 99 a
  7. 2 GR Weeds in the Same Field Steckel 2010
  9. Preplant/PRE herbicides for Palmer amaranth in Roundup Ready Cotton in SE Preplant PRE Valor Prowl + diuron + Staple Direx Reflex + Staple Reflex + Cotoran Reflex + diuron Reflex + Prowl Prowl + Cotoran Prowl + diuron *Paraquat included with PRE except conventional till!
  10. Palmer amaranth control by PRE herbicides; 40 days* Cotoran Prowl Valor** Direx Caparol Reflex % control * Average of 5 locations; 2 in GA, 3 in NC. No other herbicides included. ** Applied same time as the PRE herbicides. Staple (ALS susceptible)
  11. GR Weed Management in Cotton Cotoran/Caparol or Reflex on coarse soils 30 to 21 DBP Pre Emergence Dicamba + glyphosate or Gramoxone Inteon +/- Valor Near Planting Burndown Reflex apply 14 DBP and ½” of rain
  12. Controlling GR Palmer amaranth in RR cotton. 2011. SE and MS.
  13. Concept of Overlapping Residuals Critical herbicide concentration
  14. Concept of Overlapping Residuals Critical herbicide concentration
  15. Concept of Overlapping Residuals Critical herbicide concentration
  16. Early topical applications with residual needed before Palmer emerges in RR cotton!! Prowl + Reflex PRE, Roundup + Dual Magnum POST 1, Roundup + Warrant POST 2, Direx + MSMA layby POST 1 = 25 days after PRE POST 1 = 17 days after PRE
  17. Hooded Spray or Layby Rig Diuron + MSMA + COC Suprend + MSMA + COC Layby Pro + MSMA + COC Gramoxone + diuron + COC (+ Valor) (still have to direct to row)
  18. Monsanto’s Roundup Ready Cotton Performance Roundup Ready Flex Cotton (Up to $20) *Will pay on 2 applications
  19. Dryland Conservation Tillage Prowl + Reflex PRE Roundup + Dual POST Diuron + MSMA PD Prowl + Reflex PRE Ignite + Dual POST Diuron + MSMA PD
  20. Palmer response to Ignite WATER VOLUME AND NOZZLE TYPE IS CRITICAL MUST KILL IT WITH THE FIRST APPLICATION
  22. 32 oz/A Gly 4 fb 29 oz/A Ignite on 12” Palmer
  24. Controlling GR Palmer amaranth in LL conventional DRYLAND cotton.
  25. Phytogen Widestrike Cotton Confers tolerance to Ignite Tolerance not complete; injury will occur and yield loss can occur if you don’t know what you are doing. According to EPA, Ignite can be applied to widestrike cotton. However, grower is liable as neither Bayer, Dow, nor any University recommends or warrant the use of Ignite on Widestrike cotton
  26. Phytogen Widestrike Cotton (treated with Ignite) 2004: 1 plot (researchers playing) 2005: 0.25 acres (research) 2006: 16 acres (research) 2007: <20,000 acres 2008: ~40,000 acres 2009: ~225,000 acres 2010: >750,000 acres
  27. Weed management in LL vs WRF cotton
  28. 375 WideStrike Cotton Tolerance to Multiple Applications of Ignite Pounds Lint Cotton Culpepper, York and Steckel 2010 a a a b
  29. 375 WideStrike Cotton Tolerance to Multiple Applications of Ignite Pounds Lint Cotton a a b No Ignite Ignite 2 lf and 7 lf Ignite 2 lf, 7 lf, bloom
  30. 375 WideStrike Cotton Tolerance to Multiple Applications of Ignite Pounds Lint Cotton a a b No Ignite Ignite 2 lf and 7 lf Ignite 2 lf, 7 lf, bloom
  31. 2 lf Photo 5 d after 2 lf application
  32. Photo 5 d after bloom + 2 wk application
  33. Can not survive with herbicides alone any longer
  35. Staple + Reflex + Direx PRE Roundup WMax + Parrlay POST Direx + MSMA Layby What percent Palmer amaranth control?
  36. Developing Integrated Programs
  37. York 2010 Hand Weeding 2010: GA: Herbicide input: $90 million 2010: TN: Herbicide input: $35 million
  38. York 2010 Hand Weeding GA: 92% of growers handweeding 53% of the 2010 crop = $16 million TN: growers handweeding 20% of crop = $3 million
  39. TREFLAN/PROWL PPI PRE
  40. 5 % acres *Average of Macon, Taylor, Sumpter, Schley, and Dooly counties Herbicide Incorp. 0 Impact of GR Palmer amaranth in Georgia counties with severe infestations.*
  41. Tillage in Cotton During 2010
  42. Most Palmer amaranth emerges from top inch
  43. No Deep Tillage Deep Turn No Herbicide Treatment Number of Palmer Amaranth Plants During Early Season. Macon Co., Georgia 2008.*
  44. GR Palmer amaranth control by tillage and cover crop residue. 2006-2010..* 0 b 50 a Weeds *No herbicide Deep inversion %
  45. Palmer requires a significant amount of sunlight to emerge!!
  47. >90% control in middles
  48. In the rye, control loss was in the strip
  49. Activating our residual herbicides! Palmer free at planting! Ignite resistance management! PPO resistance management! ALS (and other) chemistry resistant mgmt!
  50. Comments or Questions? 2002: $20/A 2010: $63/A