Slide Presentation

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Weed Control in Field Corn and Forage Sorghum - UGA Corn Silage & Forage Field Day

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 and Forage Sorghum
  2. Field Corn Weed Control Questions for you?
  3. Pigweed Should Not Be a Problem!!!!
  4. A general plan of attack?
  5. Starting Clean
  6. To PRE or Not to PRE?
  7. Dual, Outlook, Warrant, Zidua????
  8. Field Corn Weed Control – 2019 Roundup + Atrazine + Prowl H20 (~$18/A)
  9. Field Corn Weed Control – 2019 Roundup + Laudis + Atrazine (~$18/A)
  10. Field Corn Weed Control – 2019 Halex GT + Atrazine + NIS (~$24/A)
  11. Field Corn Weed Control – 2019 Liberty + Atrazine (~$18/A)
  12. Field Corn Weed Control – 2019 Roundup + Impact Z (~$14/A)
  13. Field Corn Weed Control – 2019 Roundup + Engenia + Prowl H20 (~$18/A)
  14. Field Corn Weed Control – 2019 Roundup + Status + Prowl H20 (~$31/A)
  15. Field Corn Injury – Status (dicamba)
  16. Field Corn Weed Control – 2019 Atrazine (PRE) fb Roundup + Acuron (POST) ($31/A)
  17. Corn Herbicide Rotation Restrictions for Corn, Sorghum, Soybean, Ryegrasss
  18. Public Enemy #1 in Field Corn
  19. Lay-By Rig for Morningglory
  20. Roundup Powermax II @ 32 oz/A + Evik 80DF @ 2 lbs/A – 36 DAT (June 15, 2018)
  21. 2019 Lay-By Test - I UGA Ponder Farm
  22. Post-Harvest Palmer Amaranth Populations Must be Managed!
  23. Palmer Amaranth Burndown - 2019 (AMAPA 1-6” tall)
  24. Tropical Spiderwort/Benghal Dayflower (TSW/BD) After Corn Harvest
  25. Post-Harvest Control of TSW/BD with 2 Applications (14 d apart) of Gramoxone (paraquat)
  26. FORAGE SORGHUM WEED CONTROL UPDATE
  27. FORAGE SORGHUM WEED CONTROL
  28. Grain Sorghum Weed Control - 2018
  29. Weed Control in Grain Sorghum - 2015
  30. A New Product to Consider?
  31. Weed Control in Grain Sorghum - 2015
  32. Huskie Injury on Sorghum
  33. Other Sorghum Options
  34. Questions/Comments?



SLIDE CONTENTS
  1. Eric P. Prostko, Ph.D. Professor/Extension Weed Specialist Dept. Crop & Soil Sciences Weed Control in Field Corn and Forage Sorghum June 20, 2019
  2. Field Corn Weed Contrl Questions for you? What technologies have you planted? RR, LL, Conventional, Enlist (2,4-D)? Have you used Counter INFR? Is atrazine still working for you? What will be planted after the field corn?
  3. Pigweed Should Not Be a Problem!!!! moisture activated residual? atrazine resistance timing/coverage weeds too big corn too big environmental hot and dry #1 enemy POST’s
  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) Follow up with a timely POST program that includes an additional 1.5 qt/A of Atrazine 4L Lots of options depending upon how you answered previous questions?
  5. Starting Clean If you are getting ready to plant and get to the field and have pigweed > 6” tall ………… Park the sprayer Go get your mower, disk, and/or bottom plow
  6. To PRE or Not to PRE?
  7. Dual, Outlook, Warrant, Zidua????
  8. Field Corn Weed Control – 2019 Roundup + Atrazine + Prowl H20 (~$18/A) CN-07-19 May 13 19 DAT NTC Roundup PowerMax @ 32 oz/A Atrazine @ 64 oz/A Prowl H20 @ 32 oz/A Applied 23 DAP (V5/8” tall)
  9. Field Corn Weed Control – 2019 Roundup + Laudis + Atrazine (~$18/A) CN-07-19 May 13 19 DAT NTC Roundup PowerMax @ 32 oz/A Laudis @ 3 oz/A Atrazine @ 64 oz/A Applied 23 DAP (V5/8” tall)
  10. Field Corn Weed Control – 2019 Halex GT + Atrazine + NIS (~$24/A) CN-07-19 May 13 19 DAT NTC Halex GT @ 58 oz/A Atrazine @ 64 oz/A NIS @ 0.25% v/v Applied 23 DAP (V5/8” tall)
  11. Field Corn Weed Control – 2019 Liberty + Atrazine (~$18/A) CN-04-19 May 13 19 DAT NTC Liberty @ 32 oz/A Atrazine @ 64 oz/A Applied 22 DAP (V4/8” tall)
  12. Field Corn Weed Control – 2019 Roundup + Impact Z (~$14/A) CN-04-19 May 13 19 DAT NTC Roundup PowerMax @ 32 oz/A Impact Z @ 8 oz/A Applied 22 DAP (V4/8” tall)
  13. Field Corn Weed Control – 2019 Roundup + Engenia + Prowl H20 (~$18/A) CN-08-19 May 10 18 DAT NTC Roundup W-Max @ 32 oz/A Engenia @ 6.4 oz/A Prowl H2O @ 32 oz/A Applied 21 DAP (V4/7” tall)
  14. 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)
  15. 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
  16. Field Corn Weed Control – 2019 Atrazine (PRE) fb Roundup + Acuron (POST) ($31/A) CN-09-19 May 10 10 days after POST NTC Atrazine @ 32 oz/A (PRE) fb Roundup W-Max @ 32 oz/A Acuron @ 48 oz/A Applied 28 DAP (V6/12” tall)
  17. Corn Herbicide Rotation Restrictions for Corn, Sorghum, Soybean, Ryegrasss
  18. Public Enemy #1 in Field Corn
  19. Lay-By Rig for Morningglory Ponder Farm May 9, 2019
  20. Roundup Powermax II @ 32 oz/A + Evik 80DF @ 2 lbs/A – 36 DAT (June 15, 2018) NTC TREATED 16 GPA 30 PSI 3.7 MPH V7-V8 24” tall FloodJet TK-VS2 7 row middles Treated NTC NTC
  21. 2019 Lay-By Test - I UGA Ponder Farm June 11 33 DAT Roundup Powermax II @ 32 oz/A Tricor 4L @ 5 oz/A NTC
  22. Post-Harvest Palmer Amaranth Populations Must be Managed!
  23. Palmer Amaranth Burndown - 2019 (AMAPA 1-6” tall) NC-01-19 May 30 10 DAT NTC Gramoxone 3SL @ 32 oz/A Tricor 4L @ 8 oz/A Induce @ 0.25% v/v
  24. Tropical Spiderwort/Benghal Dayflower (TSW/BD) After Corn Harvest (need tillage and/or 2 apps of Gramoxone or 2,4-D or Aim)
  25. Post-Harvest Control of TSW/BD with 2 Applications (14 d apart) of Gramoxone (paraquat) 1 week after POST2
  26. FORAGE SORGHUM WEED CONTROL UPDATE Eric P. Prostko, Ph.D. Professor/Extension Weed Specialist Dept. Crop & Soil Sciences
  27. FORAGE SORGHUM WEED CONTROL Start clean! Concep treated seed Dual Magnum or Warrant (PRE) Atrazine 4L @ 1.5 QT/A (EPOST) Add Huskie if you have ATZ resistance Paraquat (Hooded sprayer) Mechanical Cultivation
  28. Grain Sorghum Weed Control - 2018 GS-01-18 July 20 86 DAP Dual Magnum 7.62EC 24 oz/A (PRE) NTC
  29. Weed Control in Field Corn and Forage Sorghum - UGA Corn Silage & Forage Field Day SG-01-15 May 26 49 DAP NTC Warrant @ 48 oz/A – PRE Atrazine @ 48 oz/A – 23 DAP COC @ 1% v/v – 23 DAP
  30. A New Product to Consider? Huskie 2.06EC Bayer CropScience Buctril (1.75 lbs/gal) + pyrasulfotole (0.31 lbs/gal) MOA = 6 + 27 Postemergence (13-16 oz/A) 3-leaf to 12” tall sorghum Broadleaf weeds, good on pigweed Tank-mix with atrazine (16 oz/A)
  31. Weed Control in Field Corn and Forage Sorghum - UGA Corn Silage & Forage Field Day SG-01-15 May 26 49 DAP NTC Dual II Magnum @ 16 oz/A – PRE Huskie @ 13 oz/A – 23 DAP Atrazine @ 16 oz/A – 23 DAP AMS Xtra @ 2.5% v/v – 23 DAP NIS @ 0.25% v/v – 23 DAP
  32. Huskie Injury on Sorghum
  33. Other Sorghum Options Sandea/Permit – nutsedge Auxin Herbicides 2,4-D Dicamba Rate Weed size Injury Off-target movement Newer formulations are better (less volatile)
  34. Questions/Comments?