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Response of Glyphosate-Resistant Palmer Amaranth to Thirteen Residual Herbicides

Response of Glyphosate-Resistant Palmer Amaranth to Thirteen Residual Herbicides. Jeremy Kichler. The Objective of this Study was to Determine The Most Effective Residual Herbicides for Use in Cotton. 1. At planting 2. Postemergence 3. Layby. Two Locations in 2006. Macon County, Georgia

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Response of Glyphosate-Resistant Palmer Amaranth to Thirteen Residual Herbicides

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  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 planting2. Postemergence3. 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. 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) Herbicide Treatments and 1X Rates 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. Caparol Cotoran Direx Prowl Reflex Staple Direx Layby Pro Linex Suprend Valor SX Herbicide Options At-Planting POST Layby • Dual Mag. • Envoke • Stalwart • Staple

  11. 98 97 91 88 85 87 83 79 81 82 70 61 Percent Palmer Control by PRE Applied Residual Herbicides. 18-26 DAT.* *Data pooled over two rates. LSD: GA = 6; NC = 6

  12. 99 90 80 73 71 67 67 59 64 59 43 23 Palmer Amaranth Control by PRE Applied Residual Herbicides. 31-36 DAT.* *Data pooled over rates. 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. 97 97 88 90 86 88 86 79 Palmer Amaranth Control by POST Applied Residual Herbicides. 18-26 DAT.* *Data pooled over rates. LSD: GA = 6; NC = 6

  20. 89 90 74 73 67 64 63 56 Palmer Amaranth Control by POST Applied Residual Herbicides. 31-36 DAT.* *Data pooled over rates. LSD: GA = 10; NC = 13

  21. Stalwart Dual Mag. GA

  22. 99 97 96 92 95 91 91 81 81 73 Palmer Amaranth Control by Layby Applied Residual Herbicides. 18-26 DAT.* *Data pooled over rates. LSD: GA = 6; NC = 6

  23. 99 92 84 83 85 80 69 64 63 59 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.

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