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2011 Beltwide: Tillage impacts Reflex control of Palmer amaranth.

2011 Beltwide: Tillage impacts Reflex control of Palmer amaranth. Kichler, Culpepper, Sosnoskie, and York University of Georgia and N. C. State University. Irrigated or Dryland. Macon Co. = X % in 2010. OBJECTIVE.

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2011 Beltwide: Tillage impacts Reflex control of Palmer amaranth.

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  1. 2011 Beltwide: Tillage impacts Reflex control of Palmer amaranth. Kichler, Culpepper, Sosnoskie, and York University of Georgia and N. C. State University

  2. Irrigated or Dryland

  3. Macon Co. = X % in 2010

  4. 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

  5. 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

  6. Herbicide Treatments and Rates • Reflex 1 pt + Prowl 1 pt • None Reflex is only currently labeled as a PRE application in Georgia cotton.

  7. Application Methods PRE after planting PPI rototiller before planting PPI field cultivator before planting PPI disk harrow before planting Spray immediately before strip till

  8. Strip tillage rig

  9. Rainfall/Irrigation Planted May 14 Irrigated May 13 (0.5 inch) Irrigated May 19 (0.5 inch)

  10. Percent control of Palmer amaranth by Reflex as impacted by tillage. 14 DAP.* 99 a 95 ab 89 bc 85 c 71 d rototiller field cultivator disk strip-till PRE Prowl 1 pt/A + Reflex 1 pt/A

  11. Nontreated – 11 DAT

  12. Prowl 1 pt + Reflex 1 pt: PRE – 11 DAT

  13. Prowl 1 pt + Reflex 1 pt: PPI with rototiller – 11 DAT

  14. Prowl 1 pt + Reflex 1 pt: PPI with disk – 11 DAT

  15. Percent control of Palmer amaranth by Reflex as impacted by tillage. 38 DAP.* 99 a 91 b 80 c 75 c 3 d rototiller field cultivator disk strip-till PRE Prowl 1 pt/A + Reflex 1 pt/A

  16. Ho Herbicide

  17. PRE PPI-Rototiller Prowl (1 pt) + Reflex (1 pt) 30 days after treatment

  18. PRE PPI-Disk Prowl (1 pt) + Reflex (1 pt) 30 days after treatment

  19. Cotton injury from Reflex can be severe if rainfall occurs during emergence.

  20. Percent cotton injury by Reflex as impacted by tillage. 10 DAP.* 20 a 9 b 6 bc 4 bc 0 c rototiller field cultivator disk strip-till PRE Prowl 1 pt/A + Reflex 1 pt/A

  21. None Prowl + Reflex PRE Planted May 14 Irrigated May 13 Irrigated May 19 during emergence Prowl + Reflex PPI - Rototill

  22. Experiment 2: Soil moist but no limited activating moisture. ←Cotton Emergence April 29 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

  23. Experiment 2: Soil moist but no limited activating moisture. Herbicide options = none or Reflex 1 pt/a • Tillage: PRE or Rototill

  24. Percent control of Palmer amaranth by Reflex as impacted by tillage. 14 and 28 DAP.* 14 DAP 28 DAP 95 a 93 a 87 b 79 b PPI PRE PPI PRE Reflex 1 pt/A

  25. Reflex PRE PPI

  26. Experiment 3: Very dry soil, first rain 7 DAT.

  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. 17 and 29 DAP.* 14 DAP 35 DAP 98 96 98 92 PPI PRE PPI PRE Reflex 1 pt/A

  29. Conclusions • 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

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