Slide Presentation

TITLE    (click title to view slides)
2022 Field Corn Weed Control Update

AUTHOR
Eric P. Prostko
Professor and Extension Weed Specialist
University of Georgia

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TABLE OF CONTENTS
  1. Weed Control in Field Corn 2022
  2. Field Corn Yield Loss (%) Caused by Uncontrolled Weeds in UGA Weed Science Research Trials (2007-2021).
  3. Field Corn Weed Control Questions for you?
  4. A general plan of attack?
  5. Anthem Max, Dual, Warrant, Zidua, Outlook????
  6. Herbicide Timing Effects on Spray Coverage - 2020
  7. Herbicide Timing Effects on Spray Coverage in Field Corn - 2020
  8. Field Corn Weed Control - 2021 (Roundup PowerMax3, Atrazine, Prowl H2O)
  9. Field Corn Weed Control - 2021 (Liberty, Atrazine, Prowl H2O)
  10. Field Corn Weed Control - 2021 (Roundup PowerMax3, Laudis, Atrazine, Prowl H2O)
  11. Field Corn Weed Control - 2021 (Halex GT, Atrazine, Prowl H2O, Induce)
  12. Annual Grass Control in Field Corn - 2021
  13. Field Corn Weed Control - 2021 (Acuron, Atrazine, Induce)
  14. Field Corn Weed Control - 2021 (Acuron 3.44SC)
  15. Comparison of Acuron, Acuron Flexi, Acuron GT, and Halex GT
  16. Field Corn Weed Control - 2021 (Impact, Roundup P-Max3, Atrazine 4L)
  17. Field Corn Weed Control - 2021 (Shieldex, Atrazine, Agridex, AMSOL)
  18. Field Corn Weed Control - 2021 (Roundup P-Max3, Revulin Q, Atrazine)
  19. What about dicamba?
  20. Field Corn Weed Control - 2019 Roundup + Status + Prowl H20 (~$31/A)
  21. Field Corn Injury - Status (dicamba)
  22. Roundup W-Max @ 32 oz/A + dicamba @ 0.25 lb ae/A + Prowl H20 @ 32 oz/A (Applied 9 DAP, V1/2" tall field corn)
  23. Roundup W-Max @ 32 oz/A + dicamba @ 0.25 lb ae/A + Prowl H20 @ 32 oz/A (Applied 21 DAP, V4/7" tall field corn)
  24. Field Corn Yield (DKC-6208) As Influenced By Herbicide Treatment
  25. New(er) Products Being Tested
  26. Morningglory Control in Field Corn?????
  27. Field Corn Lay-By (16 GPA, 30 PSI, 3.7 MPH, Floodjet TK-VS2)
  28. Post-Harvest Weed Control Gramoxone 2L @ 3 pts/A + Tricor 4L @ 8 oz/A + NIS @ 0.25% v/v
  29. Post-Harvest Weed Control Gramoxone 2L @ 3 pts/A + Tricor 4L @ 8 oz/A + NIS @ 0.25% v/v
  30. Post-Harvest Weed Control Gramoxone 2L @ 3 pts/A + Tricor 4L @ 8 oz/A + NIS @ 0.25% v/v
  31. Tropical Spiderwort/Benghal Dayflower
  32. Tropical Spiderwort Control in Field Corn Control with Lay-Bys (8 DAT)
  33. Tropical Spiderwort/Benghal Dayflower (TSW/BD) After Corn Harvest
  34. Post-Harvest Control of TSW/BD with 2 Applications (14 d apart) of Gramoxone (paraquat)
  35. Field Corn Weed Control - Summary
  36. Questions/Comments?



SLIDE CONTENTS
  1. Eric P. Prostko, Ph.D. Professor/Extension Weed Specialist Dept. Crop & Soil Sciences eprostko@uga.edu Weed Control in Field Corn 2022
  2. Field Corn Yield Loss (%) Caused by Uncontrolled Weeds in UGA Weed Science Research Trials (2007-2021). Treated vs. Non-treated 200 Bu/A X 0.33 X $4.00 = $264/A What about harvest? What about next year?
  3. Field Corn Weed Control Questions for you? What technologies are you planting? RR, LL, Conventional, Enlist (2,4-D)? Do you need Counter? Is atrazine still working for you on pigweed? Lets assume it does not What will be planted after the field corn?
  4. A general plan of attack? MUST START CLEAN! Use 1 qt/A of Atrazine 4L PRE (or Dual II Magnum, or Warrant, or Outlook) Zidua/Anthem Max (POST) Follow up with a timely POST program (V3-V5 stage) that includes an additional 1.5 qt/A of Atrazine 4L Roundup + Atrazine probably not good enough anymore! Roundup Cost$/Supply Lots of options depending upon how you answered previous questions? Liberty, Laudis, Impact/Armezon, Halex GT, Callisto, Revulin Q, Shieldex, Acuron, Acuron GT, dicamba, 2,4-D
  5. Anthem Max, Dual, Warrant, Zidua, Outlook????
  6. Herbicide Timing Effects on Spray Coverage - 2020 CN-06-20 Miller Co. 30 DAP April 16 JD 4630 90’ boom length 20” nozzle spacing 10 GPA 32 PSI 11 MPH 8003EVS Roundup + Atrazine + Quest + Grounded
  7. Herbicide Timing Effects on Spray Coverage in Field Corn - 2020 2” 6” CN-06-20 JD 4630, 90’ Boom 20” Nozzle Spacing 10 GPA, 32 PSI 11 MPH 8003EVS Nozzles V4: 9-10” tall 20 DAP V6: 14-16” tall 30 DAP
  8. Field Corn Weed Control - 2021 CN-02-21 May 3 17 DAT NTC Roundup PowerMax3 @ 25 oz/A Atrazine @ 64 oz/A Prowl H20 @ 32 oz/A Applied 18 DAP
  9. Field Corn Weed Control - 2021 CN-02-21 May 3 17 DAT NTC Liberty @ 32 oz/A Atrazine @ 64 oz/A Prowl H20 @ 32 oz/A Applied 18 DAP
  10. Field Corn Weed Control - 2021 CN-02-21 May 3 17 DAT NTC Roundup PowerMax3 @ 25 oz/A Laudis @ 3 oz/A Atrazine @ 64 oz/A Prowl H20 @ 32 oz/A Applied 18 DAP
  11. Field Corn Weed Control - 2021 CN-02-21 May 3 17 DAT NTC Halex GT @ 58 oz/A Atrazine @ 64 oz/A Prowl H20 @ 32 oz/A Induce @ 0.25% v/v Applied 18 DAP
  12. Annual Grass Control in Field Corn - 2021 CN-02-21 May 10 42 DAP Applied 18 DAP LSD 0.10 = 12
  13. Field Corn Weed Control - 2021 CN-11-21 May 14 53 DAP Acuron GT @ 60 oz/A Atrazine @ 32 oz/A Induce @ 0.25% v/v Applied 23 DAP
  14. Field Corn Weed Control - 2021 CN-08-21 May 13 51 DAP NTC Acuron 3.44SC @ 80 oz/A (Applied PRE)
  15. Comparison of Acuron, Acuron Flexi, Acuron GT, and Halex GT  
  16. Field Corn Weed Control - 2021 CN-06-21 May 13 45 DAP NTC Impact 2.8L @ 0.75 oz/A Roundup P-Max3 5.88SL @ 21 oz/A Atrazine 4L @ 32 oz/A Applied 18 DAP
  17. Field Corn Weed Control - 2021 CN-09-21 April 29 16 DAT NTC Shieldex @ 1 oz/A Atrazine @ 32 oz/A Agridex @ 1% v/v AMSOL @ 2% v/v Applied 21 DAP
  18. Field Corn Weed Control - 2021 CN-08-21 May 14 53 DAP NTC Roundup P-Max3 @ 21 oz/A Revulin Q @ 3.5 oz/A Atrazine @ 32 oz/A Applied 23 DAP
  19. What about dicamba? Clarity = dicamba Status = dicamba + diflufenzopyr + isoxadifen (safener) Diflexx = dicamba + cyprosulfamide (safener) Newer, lower volatility, dicamba formulations are not labeled Engenia Xtendimax
  20. Field Corn Weed Control – 2019 Roundup + Status + Prowl H20 (~$31/A) CN-08-19 May 10 18 DAT NTC Roundup W-Max @ 32 oz/A Status @ 5.0 oz/A Prowl H2O @ 32 oz/A Applied 21 DAP (V4/7” tall)
  21. Field Corn Injury – Status (dicamba) CN-04-16 Agrigold 6659 7 DAT (April 25, 2016) Roundup P-Max @ 32 oz/A + Status @ 5 oz/A Applied 27 DAP V4-V5; 7” tall No yield effect
  22. Roundup W-Max @ 32 oz/A + dicamba @ 0.25 lb ae/A + Prowl H20 @ 32 oz/A (Applied 9 DAP, V1/2” tall field corn) CN-08-19 April 16 6 DAT
  23. Roundup W-Max @ 32 oz/A + dicamba @ 0.25 lb ae/A + Prowl H20 @ 32 oz/A (Applied 21 DAP, V4/7” tall field corn) CN-08-19 April 24 2 DAT
  24. Field Corn Yield (DKC-6208) As Influenced By Herbicide Treatment CN-08-19, Averaged over 3 timings (V1, V4, and V6), WEEDY Bu/A LSD (0.10) = 13.2 CV = 7.3
  25. New(er) Products Being Tested AMVAC Sinate (glufosinate + topramezone) Impact Core (topramezone + acetochlor) Corteva Resicore (mesotrione + acetochlor + clopyralid) Syngenta Acuron GT (bicyclopyrone + s-metolachlor + mesotrione + glyphosate) Acuron XR (bicyclopyrone + s-metolachlor + mesotrione + atrazine) Helm Katagon (tolpyralate + nicosulfuron) Helmet Maxx (metolachlor + atrazine + mesotrione) Helena Empyros (tolpyralate + s-metolachlor) Empyos Triad (tolpyralate + s-metolachlor + atrazine) (not in SE) Empyros Triad Flex (tolpyralate + s-metolachlor + atrazine) (not in SE) Valent Maverick (mesotrione + pyroxasulfone + clopyralid) Summit Agro Restraint (tolpyralate + acetochlor + dichlormid)
  26. Morningglory Control in Field Corn?????
  27. Field Corn Lay-By (16 GPA, 30 PSI, 3.7 MPH, Floodjet TK-VS2)
  28. Post-Harvest Weed Control Gramoxone 2L @ 3 pts/A + Tricor 4L @ 8 oz/A + NIS @ 0.25% v/v 09/24/21 Day of application
  29. Post-Harvest Weed Control Gramoxone 2L @ 3 pts/A + Tricor 4L @ 8 oz/A + NIS @ 0.25% v/v 10/22/21 28 DAT
  30. Post-Harvest Weed Control Gramoxone 2L @ 3 pts/A + Tricor 4L @ 8 oz/A + NIS @ 0.25% v/v 11/03/21 40 DAT
  31. Tropical Spiderwort/Benghal Dayflower Bury seed! Residuals-Group 15’s Dual Magnum, Outlook, Warrant, Zidua, Anthem Max POST – 2,4-D Directed Aim, Paraquat, Evik Post-Harvest 2,4-D, Aim, Paraquat
  32. Tropical Spiderwort Control in Field Corn Control with Lay-Bys (8 DAT) Untreated Aim 2EC @ 1.5 ozs/A Agrioil @ 1% v/v Gramoxone 3SC @ 1 pt/A 80/20 @ 0.25% v/v Evik 80WP @ 2 lb/A 80/20 @ 0.5% v/v CN-11-04 COMBE:1-6”; 2-7 LF
  33. Tropical Spiderwort/Benghal Dayflower (TSW/BD) After Corn Harvest (need tillage and/or 2 apps of Gramoxone or 2,4-D or Aim)
  34. Post-Harvest Control of TSW/BD with 2 Applications (14 d apart) of Gramoxone (paraquat) CN-01-06 COMBE: 8-10”, flowering 1 week after POST2
  35. Field Corn Weed Control - Summary Start Clean Use a PRE Timely POST (V3-V5) need something else with Roundup + ATZ Lay-By for MG Post-Harvest pigweed dayflower
  36. Questions/Comments? eprostko@uga.edu www.gaweed.com