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AUTHOR
Jeremy Kichler
University of Georgia

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TABLE OF CONTENTS
  1. Response of Glyphosate-Resistant Palmer Amaranth to Thirteen Residual Herbicides
  2. The Objective of this Study was to Determine The Most Effective Residual Herbicides for Use in Cotton
  3. Two Locations in 2006
  4. Methods
  5. Planting Dates and Rainfall
  6. Herbicide Treatments and 1X Rates
  7. Data Reporting
  8. Percent Palmer Control Averaged Over Herbicide Treatments, 18-26 DAT.
  9. Percent Palmer Control Averaged Over Herbicide Treatments, 31-36 DAT.
  10. Herbicide Options
  11. Percent Palmer Control by PRE Applied Residual Herbicides. 18-26 DAT.
  12. Palmer Amaranth Control by PRE Applied Residual Herbicides. 31-36 DAT.
  13. Planting Dates and Rainfall
  14. Non-treated
  15. Reflex vs Staple
  16. Prowl vs Caparol
  17. Reflex vs Staple
  18. Prowl vs Caparol
  19. Palmer Amaranth Control by POST Applied Residual Herbicides. 18-26 DAT.
  20. Palmer Amaranth Control by POST Applied Residual Herbicides. 31-36 DAT.
  21. Stalwart vs Dual Mag.
  22. Palmer Amaranth Control by Layby Applied Residual Herbicides. 18-26 DAT.
  23. Palmer Amaranth Control by Layby Applied Residual Herbicides. 31-36 DAT.
  24. Valor vs Direx
  25. Conclusions
  26. Conclusions



SLIDE CONTENTS
  1. Response of Glyphosate-Resistant Palmer Amaranth to Thirteen Residual Herbicides Jeremy Kichler
  2. The Objective of this Study was to Determine The Most Effective Residual Herbicides for Use in Cotton 1. At planting 2. Postemergence 3. Layby
  3. Two Locations in 2006 Macon County, Georgia Robeson County, North Carolina
  4. Methods Plot Size 6 feet by 22-25 feet Conventional Tillage All herbicides applied to soil without debris
  5. Planting Dates and Rainfall Planting/Application Dates May 1, 2006 Macon County, GA May 24, 2006 Robeson County, NC Factorial treatment 13 herbicides 2 herbicide rates 4 replications
  6. 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
  7. Data Reporting Data from both GA and NC reported by location at two evaluation dates Rate main effect significant Herbicide treatment main effect significant
  8. Percent Palmer Control Averaged Over Herbicide Treatments, 18-26 DAT.
  9. Percent Palmer Control Averaged Over Herbicide Treatments, 31-36 DAT.
  10. Herbicide Options Caparol Cotoran Direx Prowl Reflex Staple Direx Layby Pro Linex Suprend Valor SX Dual Mag. Envoke Stalwart Staple At-Planting POST Layby
  11. LSD: GA = 6; NC = 6 *Data pooled over two rates. Percent Palmer Control by PRE Applied Residual Herbicides. 18-26 DAT.*
  12. *Data pooled over rates. Palmer Amaranth Control by PRE Applied Residual Herbicides. 31-36 DAT.* LSD: GA = 10; NC = 13
  13. Planting Dates and Rainfall Rainfall: GA NC week 1 4.5 in 0.4 in week 2-3 0 in 2.99 in week 4-5 0 in 2.08 in
  14. Non-treated GA
  15. 115 Reflex Staple GA
  16. Prowl Caparol GA
  17. 115 Reflex Staple NC
  18. Prowl Caparol NC
  19. *Data pooled over rates. Palmer Amaranth Control by POST Applied Residual Herbicides. 18-26 DAT.* LSD: GA = 6; NC = 6
  20. *Data pooled over rates. Palmer Amaranth Control by POST Applied Residual Herbicides. 31-36 DAT.* LSD: GA = 10; NC = 13
  21. Stalwart Dual Mag. GA
  22. Palmer Amaranth Control by Layby Applied Residual Herbicides. 18-26 DAT.* *Data pooled over rates. LSD: GA = 6; NC = 6
  23. Palmer Amaranth Control by Layby Applied Residual Herbicides. 31-36 DAT.* *Data pooled over rates. LSD: GA = 10; NC = 13
  24. Valor Direx GA
  25. Conclusions At-Planting Options -- Reflex or Staple Topical Options -- Staple or Dual Magnum Layby Directed Options -- Suprend or Valor
  26. Conclusions Caution with Staple and Suprend due to growing occurrences of ALS inhibitor resistance. In fields without ALS resistance we recommend only 1 application of an ALS herbicide per season.