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Managing Glyphosate Resistant Palmer Amaranth With Residual Herbicides

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Kichler, Culpepper, York, MacRae, Whitaker

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TABLE OF CONTENTS
  1. Managing Glyphosate Resistant Palmer Amaranth With Residual Herbicides
  2. Glyphosate Resistant Palmer Amaranth
  3. The Objective of this Study was to Determine The Most Effective Residual Herbicides for Use in Cotton
  4. Locations
  5. Methods
  6. Methods
  7. Herbicide Treatments and 1X Rates
  8. Percent Palmer Control Averaged Over Herbicide Treatments, 21 DAT
  9. Percent Palmer Control Averaged Over Herbicide Treatments, 35 DAT
  10. Herbicide Options
  11. Percent Palmer Control by PRE Residual Herbicides. 21 DAT
  12. Percent Palmer Control by PRE Residual Herbicides. 35 DAT
  13. Non-treated
  14. Reflex vs Staple
  15. Herbicide Options
  16. Percent Palmer Amaranth Control by POST Residual Herbicides. 21 DAT
  17. Percent Palmer Amaranth Control by POST Residual Herbicides. 35 DAT
  18. Stalwart vs Dual Mag
  19. Herbicide Options
  20. Percent Palmer Amaranth Control by Layby Residual Herbicides. 21 DAT
  21. Percent Palmer Amaranth Control by Layby Residual Herbicides. 35 DAT
  22. Valor vs Direx
  23. What If It Does Not Rain For 17 Days After Application of My Residual Herbicides?
  24. Percent Palmer Control, 27 d After Activation. Rainfall Activated Herbicides 17 DAT
  25. Percent Palmer Control, 27 d After Activation. Rainfall Activated Herbicides 17 DAT
  26. Percent Palmer Control, 27 d After Activation. Rainfall Activated Herbicides 17 DAT
  27. Percent Palmer Control, 27 d After Activation. Rainfall Activated Herbicides 17 DAT
  28. Control of 2nd flush; Palmer emerged 25 DAT - No herbicide
  29. Control of 2nd flush; Palmer emerged 25 DAT - Prowl H2O 2 pt/A PRE
  30. Control of 2nd flush; Palmer emerged 25 DAT - Reflex 1 pt/A PRE
  31. Control of 2nd flush; Palmer emerged 25 DAT - Valor 1.5 oz/A PRE
  32. Conclusions
  33. Conclusions
  34. Special Thanks To Georgia Cotton Commission, North Carolina Cotton Growers Assoc., Cotton Incorporated



SLIDE CONTENTS
  1. J.M. Kichler1, A.S. Culpepper1, A.C. York2, A.W. MacRae3, J. Whitaker2 1University of Georgia, 2 North Carolina State University 3 University of Florida Managing Glyphosate Resistant Palmer Amaranth With Residual Herbicides
  3. The Objective of this Study was to Determine The Most Effective Residual Herbicides for Use in Cotton 1. At planting 2. Postemergence 3. Layby
  4. Locations Two NC locations and the GA location in 2006 received rainfall within 5 days of application. Data for three locations with timely rainfall combined. GA location in 2007 received rainfall 17 d after application. GA location in 2007 reported separately.
  5. Methods Plot Size – 6 feet by 22-25 feet Conventional Tillage All herbicides applied to soil without debris All residual herbicides were applied PRE
  6. Methods Factorial Treatment Arrangement 13 residual herbicides 1 and 1.5 X rates for Southeastern soils
  7. Herbicide Treatments and 1X Rates Caparol (2 pt) Cotoran (2 pt) Direx (2 pt) Dual Magnum (1 pt) Envoke (0.1 oz) Layby Pro (2 pt) Linex (2 pt) Prowl H2O (2 pt) Reflex (1 pt) Stalwart (1 pt) Staple LX (1.7 oz) Suprend (1.0 lb) Valor SX (1.5 oz) All treatments were applied at 1X and 1.5X rates
  8. Percent Palmer Control Averaged Over Herbicide Treatments, 21 DAT.
  9. Percent Palmer Control Averaged Over Herbicide Treatments, 35 DAT.
  10. Herbicide Options Caparol Cotoran Direx Prowl H20 Reflex Staple At-Planting
  11. *Data pooled over two rates and three locations. Percent Palmer Control by PRE Residual Herbicides. 21 DAT.* 62 c 72 b 74 b 57 c 88 a 92 a
  12. *Data pooled over two rates and three locations. Percent Palmer Control by PRE Residual Herbicides. 35 DAT.* 40 cd 50 bc 53 b 32 d 77 a 77 a
  13. Non-treated GA
  14. 115 Reflex Staple GA
  15. Herbicide Options Dual Magnum Envoke Stalwart Staple Postemergence
  16. *Data pooled over two rates and three locations. Percent Palmer Amaranth Control by POST Residual Herbicides. 21 DAT.* 83 ab 69 c 80 bc 92 a
  17. *Data pooled over two rates and three locations. Percent Palmer Amaranth Control by POST Residual Herbicides. 35 DAT.* 65 b 51 c 50 c 78 a
  18. Stalwart Dual Mag. GA
  19. Herbicide Options Direx Linex Layby Pro Suprend Valor Layby
  20. Percent Palmer Amaranth Control by Layby Residual Herbicides. 21 DAT.* *Data pooled over two rates and three locations. 74 b 74 b 75 b 91 a 91 a
  21. Percent Palmer Amaranth Control by Layby Residual Herbicides. 35 DAT.* *Data pooled over two rates and three locations. 53 b 55 b 51 b 76 a 76 a
  22. Valor Direx GA
  23. “What If It Does Not Rain For 17 Days After Application of My Residual Herbicides?” Initial flush was controlled with Ignite at 17 d after application of residual herbicides. The data reported is control of Palmer Amaranth after the first activating rainfall.
  24. Percent Palmer Control, 27 d After Activation. Rainfall Activated Herbicides 17 DAT.
  25. *Data pooled over two rates. 30 d 60 b 55 b 44 c 78 a 78 a Percent Palmer Control, 27 d After Activation. Rainfall Activated Herbicides 17 DAT.
  26. *Data pooled over two rates. 57 b 35 c 57 b 78 a Percent Palmer Control, 27 d After Activation. Rainfall Activated Herbicides 17 DAT.
  27. *Data pooled over two rates. 55 c 70 b 48 c 82 a Percent Palmer Control, 27 d After Activation. Rainfall Activated Herbicides 17 DAT.
  28. Control of 2nd flush; Palmer emerged 25 DAT No herbicide
  29. Control of 2nd flush; Palmer emerged 25 DAT Prowl H20 2 pt/A PRE
  30. Control of 2nd flush; Palmer emerged 25 DAT Reflex 1 pt/A PRE
  31. Control of 2nd flush; Palmer emerged 25 DAT Valor 1.5 oz/A PRE
  32. Conclusions At-Planting Options -- Reflex or Staple Topical Options -- Staple or Dual Magnum Layby Directed Options -- Suprend or Valor
  33. Conclusions Caution with Staple and Suprend due to growing cases of ALS inhibitor resistance. One ALS (Staple, Envoke, Suprend) herbicide application per year. One PPO (Reflex and Valor) herbicide application per year.
  34. Special Thanks To Georgia Cotton Commission North Carolina Cotton Growers Assoc. Cotton Incorporated