Slide Presentation

TITLE    (click title to view slides)
2026 Grain Sorghum and Soybean Weed Control Update

AUTHOR
Eric P. Prostko
Extension Weed Specialist
University of Georgia

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TABLE OF CONTENTS
  1. Weed Control in Grain Sorghum - 2026
  2. Grain Sorghum Weed Control
  3. Huskie Formulation Test - 2025
  4. Huskie Injury on Sorghum
  5. New Grain Sorghum Weed Control Technologies (Non-GMO)
  6. Grain Sorghum Weed Control - 2022 I-Growth
  7. Igrowth Grain Sorghum Hybrids
  8. DoubleTeam Sorghum - 2022
  9. DoubleTeam™ System - First Act, Off-Types
  10. DoubleTeam Sorghum Hybrids
  11. Inzen Grain Sorghum - 2022
  12. Strongarm and Sorghum?
  13. Grain Sorghum Response to Strongarm 84WG Applied 1 DAP
  14. 2026 Soybean Weed Control Update
  15. Dicamba Update (2024)
  16. Dicamba Update (2025) EPA Proposed Label Changes (07/23/25)
  17. Dicamba Update (2025) EPA Proposed Label Changes (07/23/25)
  18. Proposed Dicamba/VRA/240’ buffer?
  19. ESA Drift/Runoff Mitigation
  20. More Court Troubles?
  21. Soybean Weed Control Simplified
  22. Soybean Row Spacing
  23. Soybean Row Spacing Research in Georgia
  24. Conventional Soybeans
  25. 2025 Top Soybean Cultivars Planted in Georgia
  26. Soybean Weed Control - 2025
  27. 2025 Soybean Preplant Burndowns
  28. Rapidicil 0.46EC (epyrifenacil) Valent/Group 14 (PPO)
  29. Dicamba Preplant Injury (Non-Tolerant Soybean Variety)
  30. Introducing Zalo™ Herbicide - Delivered by Prolease™ Technology
  31. Zalo Tank-Mixes - 2025 Zalo
  32. Volunteer Peanut in Soybeans
  33. Soybean Green Stem - 2025
  34. UGA/OVT Green Stem Ratings - 2025
  35. Soybean Harvest Aids
  36. Harvest Weed Seed Information (https://growiwm.org/how-harvest-weed-seed-control/)
  37. Soybean Yield and Planting Date
  38. Soybean Yield and Micronutrients
  39. Soybean Yield and Biological Seed Treatments
  40. Questions/Comments?



SLIDE CONTENTS
  1. Weed Control in Grain Sorghum – 2026 Eric P. Prostko, Extension Weed Specialist Seth McAllister, Terrell Co. (October 2022)
  2. Grain Sorghum Weed Control Start clean! CONCEP treated seed Dual Magnum or Outlook or Warrant (PRE) Huskie 2.06EC @ 16 oz/A + Atrazine 4L @ 24 oz/A + NIS (EPOST) Paraquat (Hooded sprayer) Mechanical Cultivation
  3. Huskie Formulation Test – 2025 (AMAPA: 1-7” tall; 3.7” average, 50% plants > average) GS-01-25 August 26 7 DAT NTC
  4. Huskie Injury on Sorghum
  5. 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
  6. 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)
  7. Igrowth Grain Sorghum Hybrids
  8. DoubleTeam Sorghum - 2022 GS-01-22 August 1 69 DAT (POST) NTC
  9. DoubleTeam™ System – First Act Off-Types GS-02-21 June 23 9 DAT
  10. DoubleTeam Sorghum Hybrids Numeric 1 = excellent 5 = average 9 = poor SCA 1 = high tolerance 5 = moderate tolerance 9 = susceptible
  11. 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)
  12. Strongarm and Sorghum? Strongarm 84WG Applied 1 DAP 0.90 oz/A (2X rate) “bottle-brush” roots
  13. Grain Sorghum Response to Strongarm 84WG Applied 1 DAP SG-02-25 October 22 65 DAP 1X = 0.45 oz/A 4 (1/2 lives) ~152 days 5 months
  14. 2026 Soybean Weed Control Update Eric P. Prostko Professor and Extension Weed Specialist Dept. Crop & Soil Sciences
  15. Dicamba Update (2024) 02/06/24: District of Arizona Court vacated 3 dicamba labels (Engenia, Tavium, Xtendimax) for entire country Procedural errors [hearing (notice and comments) mandates for all stakeholders] 02/14/24: US EPA Existing Stocks Order Existing stocks: stocks of previously registered pesticide products that are currently in the US and were packaged, labeled, and released for shipment prior to 02/06/24. Soybean: sale & distribution until 05/31/24; use until 06/30/24. Cotton: sale & distribution until 06/30/24; use until 07/30/24.
  16. Dicamba Update (2025) EPA Proposed Label Changes (07/23/25) A single use maximum application rate of 0.5 lb. acid equivalent (ae) dicamba/A. No more than two applications allowed with a maximum annual application of 1 lb. ae dicamba/A from all combined dicamba-containing products. Prohibition of aerial applications. Maintaining a 240-ft downwind buffer. The spray solution must include an approved drift reduction agent (DRA) and pH buffering volatility reduction (VRA) agent added to the tank in higher percentages as temperatures increase.
  17. Dicamba Update (2025) EPA Proposed Label Changes (07/23/25) Temperature-dependent application restrictions to manage volatility. Users have flexibility to implement temperature-dependent restrictions by reducing the percent of field treated, including by using precision agriculture techniques, or prohibiting certain tank mixes at higher temperatures. No applications at temperatures above 950F for day of application + 1 day. Three points of mitigation required based on the runoff/erosion mitigation menu. Users must access and follow any applicable endangered species bulletin from “Bulletins Live! Two” web-based system. Six points of runoff/erosion mitigation will be required in some pesticide use limitation areas where pesticide exposures are likely to impact the continued existence of a listed species, which may include a reduction in survival or recovery of the species.  Applicators are required to wear baseline attire (i.e., long-sleeve shirt, long pants and shoes plus socks) along with personal protective equipment including chemical-resistant gloves when handling these products. A NIOSH-approved dust/mist filtering respirator with any R, P, or HE filter is also required for all handlers of the BAPMA-salt-formulated product (Engenia®). There is a restricted entry interval of 24 hours. Use is restricted to a limited number of approved states by certified applicators only. Applicators are required to complete additional dicamba-specific annual training and maintain records of all applications.
  18. Proposed Dicamba/VRA/240’ buffer?
  19. ESA Drift/Runoff Mitigation https://www.epa.gov/pesticides/pesticide-app-label-mitigations
  20. More Court Troubles? Center for Food Safety vs. EPA Originally filed 06/06/23 Motion for summary judgement filed 08/21/25 Federal Court of District of Columbia Plaintiffs argue that EPA’s 2022 registration of Enlist One® and Enlist Duo® violate FIFRA because EPA failed to fully analyze the environmental and human health costs posed by use of Enlist products. Plaintiffs argue that EPA overstated the benefits of using Enlist One® and Enlist Duo® Plaintiffs argue that the drift buffer and runoff mitigations fail to mitigate the adverse effects of Enlist One® and Enlist Duo®
  21. 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
  22. Soybean Row Spacing
  23. Soybean Row Spacing Research in Georgia
  24. 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)
  25. 2025 Top Soybean Cultivars Planted in Georgia [~$55-60/bag (140K); ~$30 for conventional] Asgrow: AG71XF2; AG69XF0; AG66XF2; AG57XF1 Dynagro: DG72XT80 Integra: XF7223; XF6772S; XF7062 Pioneer: P56A71E; P68A41BE; P70A62E Revere: 6927XF;62-F24;53-F84; 5429E3 Conventional: Hutcheson; AGS Woodruff; Virtue 4921; Musen; Pioneer P47A10; AGS V5422
  26. Soybean Weed Control - 2025 SB-05-25 June 30 55 DAP NTC Tricor 4F @ 8 oz/A Prowl H20 3.8SC @ 32 oz/A (PRE) Liberty Ultra 1.76SL @ 32 oz/A Dual Magnum 7.62EC @ 16 oz/A AMSOL @ 2.5% v/v (POST - 36 DAP) Tricor 4F @ 8 oz/A Zidua 4.17SC @ 2.5 oz/A (PRE) Liberty Ultra 1.76SL @ 32 oz/A Dual Magnum 7.62EC @ 16 oz/A AMSOL @ 2.5% v/v (POST - 36 DAP) 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 - 36 DAP)
  27. 2025 Soybean Preplant Burndowns SB-03-25 May 8 15 DAT NTC
  28. Rapidicil 0.46EC (epyrifenacil) Valent/Group 14 (PPO) SB-03-25 May 8 15 DAT NTC
  29. Dicamba Preplant Injury (Non-Tolerant Soybean Variety) SB-06-25 May 5 12 DAT No Dicamba Clarifier (dicamba) 4SL @ 8 oz/A Applied 3 days before planting
  31. Zalo Tank-Mixes – 2025 Zalo 2.52SL @ 32 oz/A + Induce @ 0.25% v/v SB-01-25 May 24 4 DAT NTC Zalo + Dual Magnum 7.62EC @ 16 oz/A + Outlook 6EC @ 16oz/A + Warrant 3ME @ 48 oz/A + Zidua 4.17SC @ 2.5 oz/A + Anthem Maxx 4.3SC @ 2.5 oz/A + Reflex 2SL @ 24 oz/A
  32. Volunteer Peanut in Soybeans Generally, peanut is tolerant of all soybean herbicides except for dicamba, glyphosate, glufosinate, and metribuzin. Control Options: Metribuzin – PRE 8 oz/A of 4L = ~45% stand reduction Liberty – POST May need 2 apps R. Ethredge May 2025
  33. Soybean Green Stem - 2025 UGA Ponder Farm October 2025 1) Seasonal environment stresses (water, temperature, hailstorms, animal damage, excessive soil nitrogen availability at R6-R7); 2) certain viruses (bean pod mottle virus, tobacco ringspot virus and alfalfa mosaic virus): 3) insects (stinkbugs, common brown leafhopper, bean leaf beetle): 4) soybean genetics (cultivars); and 5) fungicides (especially strobilurims) are considered to be causal agents and risk factors associated with green stem.
  34. UGA/OVT Green Stem Ratings - 2025
  35. 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.
  36. Harvest Weed Seed Information* (https://growiwm.org/how-harvest-weed-seed-control/) *soybean, sorghum, wheat
  37. Soybean Yield and Planting Date In 2023 (17 trials in 7 states),the effects of agricultural management practices (4–40 years), soil health metrics, inherent soil properties, location-specific factors, and soil fertility analytical results were investigated on soybean seed yield. Planting date was the most influential factor impacting soybean seed yield, with planting before May 26 consistently resulting in greater yields.
  38. Soybean Yield and Micronutrients 2019/2020 46 sites/16 states 1 application of micronutrients applied at R3 Brandt Smart B-Mo, Harvest More Urea Mate, Brandt Smart Quatro Plus, FertiRain, Sure-K, Maximum N-Pact K Based on the results of this study and the current body of published agronomic research, there is no scientific evidence to support the use of foliar fertilizer products on soybeans in the absence of visual symptoms of nutrient deficiency.
  39. Soybean Yield and Biological Seed Treatments 2022/2023 100 different sites in 22 states 9 ”biostimulants” tested Among the tested biostimulant seed treatments, none of the products consistently improved soybean yield compared to the nontreated control. Published February 2025
  40. Questions/Comments? 229-392-1034 (cell)