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

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TABLE OF CONTENTS
  1. 2025 Soybean Weed Control Update
  2. Soybean Weed Control Simplified
  3. Metribuzin Products
  4. Conventional Soybeans
  5. Soybean Weed Control - 2024 - Conventional Systems (15" row spacing)
  6. Soybean Weed Control - 2024 - Conventional Systems (15" row spacing)
  7. But would be OK with ...
  8. Soybean Weed Control - 2023
  9. Enlist Soybeans - 2023
  10. Liberty® ULTRA 1.76SL
  11. Introducing Zelo™ Herbicide - Delivered by Prolease™ Technology
  12. Soybean Weed Control - 2024 - Liberty Systems (15" row spacing)
  13. Pre-Plant Burndowns
  14. Double-Cropped Soybean Behind Field Corn
  15. HPPD/Soybean Test - 2023 - Planted 92 DAT
  16. Soybean Yield Response to HPPD Herbicides Applied 92 DBP* - 2023
  17. Soybean/HPPD - 2024 - Planted July 8 (90 DAT)
  18. Soybean Yield Response to HPPD Herbicides Applied 90 DBP* - 2024
  19. Soybean/HPPD Tests (2023-2024) - Cumulative Rainfall From Application to Planting
  20. Late Applications of PPO Herbicides
  21. Green Stem Syndrome
  22. Soybean Harvest Aids
  23. Weed Control in Grain Sorghum - 2025
  24. Grain Sorghum Weed Control
  25. A New (er) Product to Consider? - Huskie 2.06EC
  26. Grain Sorghum Weed Control - 2021
  27. Huskie Injury on Sorghum
  28. Texas Panicum in Grain Sorghum
  29. New Grain Sorghum Weed Control Technologies (Non-GMO)
  30. Grain Sorghum Weed Control - 2022 - I-Growth
  31. Igrowth Grain Sorghum Hybrids
  32. DoubleTeam Sorghum - 2022
  33. DoubleTeam™ System - First Act Off-Types
  34. DoubleTeam Sorghum Hybrids
  35. Inzen Grain Sorghum - 2022
  36. Sunflower Weed Control
  37. What is labeled? (not much)
  38. Harvest Aids for Sunflowers
  39. Valor PRE on Sunflowers?? NO, NO, NO!
  40. Sunflower Weed Control - 2024
  41. Sunflower Weed Control - 2024
  42. Know Who to Contact (Your Extension Weed Science Team)
  43. Aquatic Resources Outreach Team
  44. Forestry/Pine Trees Warnell School of Forestry
  45. Questions/Comments?



SLIDE CONTENTS
  1. 2025 Soybean Weed Control Update Eric P. Prostko Professor and Extension Weed Specialist Dept. Crop & Soil Sciences
  2. Soybean Weed Control Simplified Start clean Narrow rows (< 30”) PRE Metribuzin + Group 15 or Prowl tolerant variety Irrigation or rainfall POST + Residual (weeds <3” tall) Post = Reflex or Prefix or Warrant Ultra or Liberty or Zalo or Enlist One (2,4-D choline) or Enlist Duo (glyphosate + 2,4-D choline) Residual = Anthem Flexx/Max or Dual or Warrant or Outlook or Zidua Check tank-mix sites first
  3. Metribuzin Products
  4. Conventional Soybeans PPO resistant weeds = SOL (really!) Metribuzin – PRE Prowl or Group 15’s Reflex, Cobra, Ultra Blazer, Prefix, Warrant Ultra Classic or FirstRate (sicklepod + MG) STS® (1993) - single gene (non-GMO) Bolt™ (2015) - 2 genes (non-GMO)
  5. Soybean Weed Control – 2024 Conventional Systems (15” row spacing) SB-04-24 August 19 104 DAP NTC Tricor 4F @ 8 oz/A Zidua 4.17SC @ 2.5 oz/A PRE Reflex 2SL @ 24 oz/A Classic 25DG @ 0.5 oz/A Induce @ 0.25% v/v POST (31 DAP)
  6. Soybean Weed Control – 2024 Conventional Systems (15” row spacing) SB-04-24 August 19 104 DAP NTC Tricor 4F @ 8 oz/A Dual Magnum 7.62EC @ 16 oz/A PRE Reflex 2SL @ 24 oz/A Classic 25DG @ 0.5 oz/A Induce @ 0.25% v/v POST (31 DAP)
  7. But would be OK with …… PRE Valor or Envive (Valor + Classic + Harmony) or Surveil (Valor + FirstRate) or Fierce (Valor + Zidua) or Fierce MTZ (Valor + Tricor + Zidua) or Trivence (Valor + Tricor + Classic) POST Roundup + Xtendimax/ Engenia + residual (Xtend System) or Liberty + residual (Liberty-Link or XtendFlex System) or Liberty + Enlist One + residual (Enlist System)
  8. Soybean Weed Control - 2023 SB-05-23 June 6 48 DAT NTC
  9. Enlist Soybeans - 2023 NTC SB-04-23 June 6 29 DAT
  10. Liberty® ULTRA 1.76SL BASF glufosinate-P-ammonium More active isomer Dual vs. Dual Magnum Metolachlor vs. S-metolachlor lower use rate (19-29 oz/A) Mandatory downwind spray buffer ground = 10’/aerial = 50’ 3 points for ESA runoff/erosion Tift Co. = 2 points sandy soils = 2 points
  11. Soybean Weed Control – 2024 Liberty Systems (15” row spacing) SB-04-24 August 19 104 DAP NTC
  12. Pre-Plant Burndowns BN-03-24 April 10 20 DAT NTC Helmquat 3SL @ 32 oz/A Rancor 4F @ 16 oz/A AMSOL @ 2% v/v MSO @ 1% v/v
  13. Double-Cropped Soybean Behind Field Corn What herbicides are safe? Roundup, Liberty, Group 15’s, Atrazine (?) What about the HPPD herbicides? Callisto = 10 months Impact = 9 months Laudis = 8 months Shieldex = 9 months What about south Georgia? Irrigation, sandier soils, low OM less carryover potential (?)
  14. HPPD/Soybean Test - 2023 Planted 92 DAT SB-03-23 October 31
  15. Soybean Yield Response to HPPD Herbicides Applied 92 DBP* - 2023 SB-03-23 Asgrow AG66XF2 PD: July 3 7.5” rows LSD 0.10 = 9.8 -30% -68% Bu/A
  16. Soybean/HPPD – 2024 Planted July 8 (90 DAT) SB-03-24 September 10 64 DAP NTC Laudis 3.5SC 3 oz/A Impact 2.8SC 1.25 oz/A Shieldex 3.33SC 1.35 oz/A
  17. Soybean Yield Response to HPPD Herbicides Applied 90 DBP* - 2024 SB-03-24 Asgrow AG66XF2 PD: July 8 7.5” rows P = 0.7666 CV = 18.5 Bu/A
  18. Soybean/HPPD Tests (2023-2024) Cumulative Rainfall From Application to Planting
  19. Late Applications of PPO Herbicides The diphenyl ether herbicides (Cobra, Reflex, Ultra Blazer) applied at reproductive growth stages (R1, R3, R5) have no negative impact on developing soybean flowers and pods. Even with foliar injury as high as 55%, soybean plants are able to compensate for this injury and produce yields comparable to nontreated soybean plants. Applications made by growers as “rescue” applications late in the season do not lead to soybean yield loss. Source: Beam et al. 2018. Weed Technology 32:444-447
  20. Green Stem Syndrome SUCKS! cultivar stink bug/kudzu bug feeding late herbicide application fungicide application (“strobi”) infection by one of several soybean viruses late planting and/or emergence mixed seed lots (seed lots of blended cultivars) Paraquat not consistent Asgrow 66XF2 Planted June 7 10 Days after Paraquat (Harvest Aid) 11/04/24
  21. Soybean Harvest Aids Roundup (glyphosate) 7 d PHI Gramoxone (paraquat) 15 d PHI Aim (carfentrazone) 3 d PHI Sharpen (saflufenacil) 3 d PHI Defol (sodium chlorate) 10 d PHI R7 = beginning maturity, 1 pod on mainstem has reached mature pod color Source: LSU, Dr. Jim Griffin et al.
  22. Weed Control in Grain Sorghum – 2025 Eric P. Prostko, Extension Weed Specialist Seth McAllister, Terrell Co. (October 2022)
  23. Grain Sorghum Weed Control Start clean! Concep treated seed Dual Magnum or Outlook or Warrant (PRE) Atrazine 4L @ 1.5 QT/A (EPOST) Add Huskie if you have ATZ resistance Paraquat (Hooded sprayer) Mechanical Cultivation
  24. A New (er) 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) Huskie FX = Huskie + Starane
  25. Grain Sorghum Weed Control - 2021 GS-04-21 July 16 58 DAP NTC Warrant @ 48 oz/A Atrazine @ 16 oz/A Huskie @ 16 oz/A Induce @ 0.25% v/v AMS @ 5% v/v Applied 19 DAP
  26. Huskie Injury on Sorghum
  27. Texas Panicum in Grain Sorghum Terrell Co. 08/05/22
  28. New Grain Sorghum Weed Control Technologies (Non-GMO) Igrowth® Alta/UPL ImiFlex (imazamox) PRE/POST DoubleTeam™ S&W/Sorghum Partners/ADAMA FirstAct (quizalofop) POST Inzen™ Pioneer/Corteva Zest (nicosulfuron) POST
  29. Grain Sorghum Weed Control – 2022 I-Growth NTC GS-01-22 August 1 69 DAT (POST)/77 DAT (EPOST) Mocassin II Plus 7.64EC @ 21 oz/A (PRE) fb Imiflex 1AS @ 6 oz/A Agridex @ 1% v/v POST (V7, 9-10” tall, 22 DAP) Imiflex 1AS @ 4 oz/A Agridex @ 1% v/v EPOST (V3, 4” tall, 14 DAP)
  30. Igrowth Grain Sorghum Hybrids
  31. DoubleTeam Sorghum - 2022 GS-01-22 August 1 69 DAT (POST) NTC
  32. DoubleTeam™ System – First Act Off-Types GS-02-21 June 23 9 DAT
  33. DoubleTeam Sorghum Hybrids Numeric 1 = excellent 5 = average 9 = poor SCA 1 = high tolerance 5 = moderate tolerance 9 = susceptible
  34. Inzen Grain Sorghum - 2022 GS-01-22 August 1 69 DAT (POST) NTC Everprex 7.62EC @ 16 oz/A (PRE) fb Zest 75DG @ 0.67 oz/A + Aatrex 4L @ 48 oz/A + Agridex @ 1% v/v (POST)
  35. Sunflower Weed Control Eric P. Prostko Extension Weed Specialist Dept. Crop & Soil Sciences UGA - Tifton
  36. What is labeled? (not much) PPI Sonalan or Treflan PPI or PRE Prowl, Dual Magnum, Zidua (only PRE), Spartan ($220/gal;3-4 oz/A; $5.16-6.88/A) POST Arrow, Assure II, Select, Poast, SelectMax (grasses only) Beyond (imazamox) only on Clearfield hybrids Beyond same family as Cadre, Pursuit, and Scepter Beyond costs about $350/gal (4 ozs/A = $10.94) $205/bag (200,000 seed ~ 10 acres) = $20.50/A Clearfield sunflower hybrids are not GMO’s Hooded Sprayer Aim 2EC @ 1-2 oz/A + COC @ 1% v/v Pigweeds must be 4” or less
  37. Harvest Aids for Sunflowers Paraquat 2SL (19-32 oz/A 3SL (13-21 oz/A) Sodium Chlorate Defol 5 4.8 qt/A Sharpen (saflufenacil) 1-2 oz/A MSO + AMS
  38. Valor PRE on Sunflowers?? NO, NO, NO! SN-01-24 June 5 28 DAP NTC Valor EZ 4SC @ 3 oz/A
  39. Sunflower Weed Control - 2024 SN-01-24 July 1 54 DAP NTC Spartan 4F @ 3.75 oz/A Zidua 4.17SC @ 2.5 oz/A PRE Cadre 2AS 4 oz/A Zidua 4.17SC @ 2.5 oz/A Induce @ 0.25% v/v POST (28 DAP) Spartan 4F @ 3.75 oz/A Zidua 4.17SC @ 2.5 oz/A PRE Beyond 1AS @ 4 oz/A Zidua 4.17SC @ 2.5 oz/A Induce 0.25% v/v POST (28 DAP)
  40. Sunflower Weed Control - 2024 SN-01-24 July 1 54 DAP NTC Spartan 4F @ 3.75 oz/A Dual Magnum 7.62EC @ 16 oz/A PRE Cadre 2AS 4 oz/A Dual Magnum 7.62EC @ 16 oz/A POST (28 DAP) Spartan 4F @ 3.75 oz/A Dual Magnum 7.62EC @ 16 oz/A PRE Beyond 1AS @ 4 oz/A Dual Magnum 7.62EC @ 16 oz/A POST (28 DAP) Surtain (pyrox + saf) Drift
  41. Know Who to Contact (Your Extension Weed Science Team) Eric Prostko Peanuts, soybeans, field corn, sunflowers, grain sorghum, sesame, canola, field pea, sugarcane Mark Czarnota Ornamentals, small fruits, nursery, landscape, greenhouse, Christmas Trees Stanley Culpepper Cotton, small grains, vegetable crops (including sweet corn) New Hire Turf Interviews completed Wayne Mitchem Tree fruits (NCSU) Lisa Baxter Pastures/Forages Bob Stougaard Pastures/Forages
  42. Forestry/Pine Trees Warnell School of Forestry David Dickens Statesboro David Clabo Tifton
  43. Questions/Comments?