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2011 Beltwide: Managing glyphosate-resistant Palmer amaranth using 2,4-D systems in Dow AgroSciences Herbicide Trait Technology (DHT) Cotton In GA, NC, and TN.

AUTHOR
Culpepper, Steckel, York (UGA, UT, NCSU)
Braxton and Richburg (Dow AgroSciences)

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TABLE OF CONTENTS
  1. 2011 Beltwide: Managing glyphosate-resistant Palmer amaranth using 2,4-D systems in Dow AgroSciences Herbicide Trait Technology (DHT) Cotton In GA, NC, and TN.
  2. Photo
  3. Photo
  4. Hand Weeding
  5. Hand Weeding
  6. DHT Cotton In Development by Dow AgroSciences
  7. Objective
  8. Glyphosate-Resistant Pigweed Species
  9. Experimental Locations
  10. Experimental Treatments
  11. Experimental Treatments
  12. Planting Dates: May 1 to May 6
  13. Percent Palmer amaranth control just prior to layby. GA1, GA2, TN, NC 2010.
  14. Percent Palmer amaranth control just prior to layby in residual systems. GA1, GA2, TN, NC 2010.
  15. Palmer amaranth control just prior to layby. Macon Co., 2010.
  16. Palmer amaranth control just prior to layby. Macon Co., 2010.
  17. Palmer amaranth control just prior to layby. Macon Co., 2010.
  18. Percent Palmer amaranth control during late season. GA1, GA2, and NC 2010.
  19. Percent Palmer amaranth control just prior to layby in residual systems. GA1, GA2, NC 2010.
  20. Photo
  21. Seed Cotton Yield. GA1 and GA2, 2010.
  22. Seed Cotton Yield. GA1 and GA2, 2010.
  23. Summary
  24. Conclusion
  25. Concerns
  26. Photo
  27. Potted cotton plants placed in all directions
  28. Temperature (F) Sept 9-11
  29. Visual Injury 27 DAA from 2,4-D Volatility, October 6, 2010
  30. Volatility Injury to Cotton: Tunnel/Dome Data
  31. Visual Injury 27 DAA from 2,4-D Volatility under Tunnels (October 6, 2010)
  32. Comments?



SLIDE CONTENTS
  1. 2011 Beltwide: Managing glyphosate-resistant Palmer amaranth using 2,4-D systems in Dow AgroSciences Herbicide Trait Technology (DHT) Cotton In GA, NC, and TN. Culpepper, Steckel, York (UGA, UT, NCSU) Braxton and Richburg (Dow AgroSciences)
  4. York 2010 Hand Weeding
  5. York 2010 Hand Weeding
  6. DHT Cotton In Development by Dow AgroSciences DHT 2,4-D tolerant cotton 2,4-D sensitive cotton
  7. Objective Determine the most effective 2,4-D weed management systems for glyphosate-resistant Palmer amaranth in DHT cotton.
  8. Amaranthus rudis Amaranthus palmeri Tennessee Missouri Illinois Mississippi Georgia S Carolina N Carolina Alabama Louisiana Arkansas Glyphosate-Resistant Pigweed Species Steckel 2010
  9. Tennessee Missouri Illinois Mississippi Georgia S Carolina N Carolina Alabama Louisiana Arkansas Experimental Locations GA Locations: completely resistant populations; NC and TN: mixed population.
  10. Experimental Treatments POST 1 (2-3“ Palmer) 2,4-D 2,4-D + Ignite® Ignite® Durango® 2,4-D + Durango® POST 2 (4-9” Palmer) 2,4-D 2,4-D + Ignite® Ignite® Durango® 2,4-D + Durango® Total POST programs Direx® + MSMA directed to all systems. 2,4-D = Weedar® 34 oz/A; Ignite® 29 oz/A; Direx® 2 pt/A; MSMA 2 lb ai/A. A non-treated control was included. TRT 1 2 3 4 5 Durango® - Dow AgroSciences, LLC Direx® - Dupont Crop Protection Ignite® - Bayer Crop Sciences LP
  11. Experimental Treatments POST 1 (2-3“ Palmer) 2,4-D 2,4-D + Ignite 2,4-D + Durango POST 2 (4-8” Palmer) 2,4-D 2,4-D + Ignite 2,4-D + Durango Prowl® and Reflex® (SE) or Cotoran® (TN) PRE Direx + MSMA directed to all systems. 2,4-D 34 oz/A; Ignite 29 oz/A; Direx and Cotoran 2 pt/A; MSMA 2 lb ai/A; Prowl H20 34 oz. TRT 1 2 3 Prowl® BASF Corporation Reflex® Syngenta Crop Protection, Inc. Cotoran® MANA - Makhteshim Agan of North America, Inc.
  12. Planting Dates: May 1 to May 6 First Activating Rainfall: GA1 = 2 d; GA 2 = 11 d; NC: 11 d; TN = 6 d Crop tolerance data not reported as technology still being developed.
  13. Percent Palmer amaranth control just prior to layby. GA1, GA2, TN, NC 2010. 74 c 85 b 43 d 86 b 93 a 93 a 99 a 2,4-D 2,4-D Dur. + D Dur. + D Durango Durango Ignite Ignite Prowl Prowl Prowl POT 1 POT 2 IG + D IG + D 97 a 2,4-D 2,4-D Dur. + D Dur. + D IG + D IG + D
  14. Percent Palmer amaranth control just prior to layby in residual systems. GA1, GA2, TN, NC 2010. 93 b 99 a Prowl Prowl Prowl POT 1 POT 2 2,4-D 2,4-D Dur. + D Dur. + D IG + D IG + D Reflex or Cotoran 92 b 93 b Reflex or Cotoran Reflex or Cotoran 93 b 99 a
  15. Durango fb Durango Palmer amaranth control just prior to layby. Macon Co., 2010.
  16. 2,4-D fb 2,4-D 2,4-D + Ignite fb 2,4-D + Ignite Palmer amaranth control just prior to layby. Macon Co., 2010.
  17. Prowl fb 2,4-D twice Prowl fb 2,4-D + Ignite twice Palmer amaranth control just prior to layby. Macon Co., 2010.
  18. Percent Palmer amaranth control during late season. GA1, GA2, and NC 2010. 75 d 84 c 28 e 90 bc 95 ab 95 ab 98 a 2,4-D 2,4-D Dur. + D Dur. + D Durango Durango Ignite Ignite Prowl Prowl Prowl POT 1 POT 2 IG + D IG + D 97 a Direx + MSMA directed to all systems. 2,4-D 2,4-D Dur. + D Dur. + D IG + D IG + D
  19. Percent Palmer amaranth control just prior to layby in residual systems. GA1, GA2, NC 2010. 95 99 Prowl Prowl Prowl POT 1 POT 2 Direx + MSMA directed to all systems. 2,4-D 2,4-D Dur. + D Dur. + D IG + D IG + D Reflex 96 95 Reflex Reflex 97 98
  21. Seed Cotton Yield. GA1 and GA2, 2010. 759 b 855 b 242 c 876 b 1170 a 1115 a 1205 a 2,4-D 2,4-D Dur. + D Dur. + D Durango Durango Ignite Ignite Prowl Prowl Prowl POT 1 POT 2 IG + D IG + D 1230 a Direx + MSMA directed to all systems. 2,4-D 2,4-D Dur. + D Dur. + D IG + D IG + D
  22. 1170 1205 Prowl Prowl Prowl POT 1 POT 2 Direx + MSMA directed to all systems. 2,4-D 2,4-D Dur. + D Dur. + D IG + D IG + D Reflex 1230 1115 Reflex Reflex 1210 1205 Seed Cotton Yield. GA1 and GA2, 2010.
  23. Summary In total POST sequential systems: Ignite + 2,4-D > Dur. + 2,4-D > 2,4-D > Ignite > Dur. In 2,4-D systems, residual applications of Prowl were as effective as Reflex or Cotoran. All programs provided at least 93% control. Control of 99% only noted with systems including sequential Ignite + 2,4-D applications. Cotton yields greater with residual systems and in the total POST system with Ignite + 2,4-D.
  24. Conclusion Numerous weed management systems in DHT Cotton will effectively manage glyphosate-resistant Palmer amaranth
  25. Concerns Making it to 2015 or when commercialized? Sustainability of Ignite? Off target movement of 2,4-D research to address this concern is in progress
  26. 2,4-D Ester 2,4-D Amine New Formulation N
  27. S SE SW E W N NE NW Potted cotton plants placed in all directions @ 5, 10, 20, 40, 80 and 160 ft 4 plants per station Volatility distance – (plants placed in field after drift pots were removed)
  28. Temperature (F) Sept 9-11 Application
  29. Visual Injury 27 DAA from 2,4-D Volatility, October 6, 2010 Error bar is 1 Std error of mean Averaged across directions Entire 48 hrs
  30. Volatility Injury to Cotton: Tunnel/Dome Data John Richburg 2010 Project Review November, 2010
  31. Visual Injury 27 DAA from 2,4-D Volatility under Tunnels (October 6, 2010) 20 20 20 19 13 0 0 4 6 Entire = 48 hrs T1 = 1st 24 hrs T2 = 2nd 24 hrs
  32. Comments?