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2011 Beltwide: Tillage impacts Reflex control of Palmer amaranth.

AUTHOR
Kichler, Culpepper, Sosnoskie, and York
University of Georgia and NC State University

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TABLE OF CONTENTS
  1. 2011 Beltwide: Tillage impacts Reflex control of Palmer amaranth.
  2. Photo
  3. Irrigated or Dryland
  4. Photo
  5. Photo
  6. Photo
  7. Photo
  8. Objective
  9. Experiment 1: Irrigated
  10. Herbicide Treatments and Rates
  11. Application Methods
  12. Strip tillage rig
  13. Rainfall/Irrigation
  14. Percent control of Palmer amaranth by Reflex as impacted by tillage. 14 DAP.
  15. Nontreated -- 11 DAT
  16. Prowl 1 pt + Reflex 1 pt: PRE -- 11 DAT
  17. Prowl 1 pt + Reflex 1 pt: PPI with rototiller -- 11 DAT
  18. Prowl 1 pt + Reflex 1 pt: PPI with disk -- 11 DAT
  19. Percent control of Palmer amaranth by Reflex as impacted by tillage. 38 DAP.
  20. Ho Herbicide
  21. Prowl (1 pt) + Reflex (1 pt)
  22. Prowl (1 pt) + Reflex (1 pt)
  23. Cotton injury from Reflex can be severe if rainfall occurs during emergence.
  24. Percent cotton injury by Reflex as impacted by tillage. 10 DAP.
  25. Prowl + Reflex
  26. Experiment 2: Soil moist but no limited activating moisture.
  27. Experiment 2: Soil moist but no limited activating moisture.
  28. Percent control of Palmer amaranth by Reflex as impacted by tillage. 14 and 28 DAP.
  29. Reflex
  30. Experiment 3: Very dry soil, first rain 7 DAT.
  31. Experiment 2: Soil moist but no limited activating moisture.
  32. Percent control of Palmer amaranth by Reflex as impacted by tillage. 17 and 29 DAP.
  33. Conclusions



SLIDE CONTENTS
  1. 2011 Beltwide: Tillage impacts Reflex control of Palmer amaranth. Kichler, Culpepper, Sosnoskie, and York University of Georgia and N. C. State University
  3. Irrigated or Dryland
  6. Macon Co. = X % in 2010
  8. OBJECTIVE Determine the impact of a rototiller, a field cultivator, and a disk harrow on the activity of Reflex. Three scenarios: Activating rainfall (irrigated production) Moist soil but no activating rain Bone dry
  9. Experiment 1: Irrigated Tift County: Palmer response study Tift County: Weed free tolerance study Plot Size – 6 by 70 feet Three Replications, RCBD PHY 375 WRF Weed free study using Ignite
  10. Herbicide Treatments and Rates Reflex 1 pt + Prowl 1 pt None Reflex is only currently labeled as a PRE application in Georgia cotton.
  11. Application Methods PRE after planting PPI rototiller before planting PPI field cultivator before planting PPI disk harrow before planting Spray immediately before strip till
  12. Strip tillage rig
  13. Rainfall/Irrigation Planted May 14 Irrigated May 13 (0.5 inch) Irrigated May 19 (0.5 inch)
  14. Percent control of Palmer amaranth by Reflex as impacted by tillage. 14 DAP.* 99 a 89 bc 95 ab 71 d PRE Prowl 1 pt/A + Reflex 1 pt/A strip-till field cultivator rototiller 85 c disk
  15. Nontreated – 11 DAT
  16. Prowl 1 pt + Reflex 1 pt: PRE – 11 DAT
  17. Prowl 1 pt + Reflex 1 pt: PPI with rototiller – 11 DAT
  18. Prowl 1 pt + Reflex 1 pt: PPI with disk – 11 DAT
  19. Percent control of Palmer amaranth by Reflex as impacted by tillage. 38 DAP.* 99 a 80 c 91 b 3 d PRE Prowl 1 pt/A + Reflex 1 pt/A strip-till field cultivator rototiller 75 c disk
  20. Ho Herbicide
  21. PRE PPI-Rototiller Prowl (1 pt) + Reflex (1 pt) 30 days after treatment
  22. PPI-Disk Prowl (1 pt) + Reflex (1 pt) 30 days after treatment PRE
  23. Cotton injury from Reflex can be severe if rainfall occurs during emergence.
  24. Percent cotton injury by Reflex as impacted by tillage. 10 DAP.* 20 a 6 bc 9 b 4 bc PRE Prowl 1 pt/A + Reflex 1 pt/A strip-till field cultivator rototiller 0 c disk
  25. Planted May 14 Irrigated May 13 Irrigated May 19 during emergence None Prowl + Reflex PRE Prowl + Reflex PPI - Rototill
  26. April 15 – 0.75 inches April 21 – 0.2 inches April 23 – 0.4 inches May 5 – 0.25 inches May 6 – 0.75 inches May 7 – 0.25 inches May 10 – 0.75 inches May 17 – 0.75 inches May 28 – 1.4 inches ? Planted April 23 ? Cotton Emergence April 29 Experiment 2: Soil moist but no limited activating moisture.
  27. Experiment 2: Soil moist but no limited activating moisture. Herbicide options = none or Reflex 1 pt/a Tillage: PRE or Rototill
  28. Percent control of Palmer amaranth by Reflex as impacted by tillage. 14 and 28 DAP.* 95 a 87 b 93 a PPI Reflex 1 pt/A PRE PRE 79 b PPI 14 DAP 28 DAP
  29. Reflex PPI PRE
  30. Experiment 3: Very dry soil, first rain 7 DAT.
  31. Experiment 2: Soil moist but no limited activating moisture. Herbicide options = none or Reflex 1 pt/a Tillage: PRE or Rototill
  32. Percent control of Palmer amaranth by Reflex as impacted by tillage. 17 and 29 DAP.* 98 98 92 PPI Reflex 1 pt/A PRE PRE 96 PPI 14 DAP 35 DAP
  33. Irrigated/Rainfall timely: PRE applications are the most effective option; however, crop injury could be reduced with a shallow incorporation that only reduced control 9%. Moist soil/no activating rainfall: PPI shallow incorporation more effective than PRE application. Bone dry soil: Control was similar with PRE or PPI applciation because Palmer did not emerge until it rained. Rototiller > Field Cultivator > Strip till > Disk Conclusions