Slide Presentation

TITLE    (click title to view slides)

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

DOWNLOAD PRESENTATION    (right click and select 'Save Target As...')

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 15s 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