Slide Presentation

TITLE    (click title to view slides)
2020 Soybean and Grain Sorghum Update

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

DOWNLOAD PRESENTATION    (right click and select 'Save Target As...')
• PowerPoint - 17 MB
• PDF - 16.2 MB

TABLE OF CONTENTS
  1. 2020 Soybean Weed Control Update
  2. Soybean Weed Control (Currently)
  3. Soybean Weed Control - 2019
  4. Soybean Weed Control - 2018
  5. Old + Cheap + Still Good (i.e. metribuzin)
  6. Metribuzin Injury
  7. Soybean Weed Control - 2019
  8. Liberty-Link® Soybeans
  9. Liberty-Link Soybean Varieties
  10. Statewide Average Yield of UGA Developed LL Soybeans*
  11. 2,4-D/Dicamba Technologies
  12. Enlist Soybeans
  13. Xtend Soybeans
  14. Roundup P-Max @ 28.4 oz/A + Tavium (VG) 56.5 oz + Intact @ 0.5% v/v + Class Act Ridion @ 1% v/v
  15. Future Soybean Weed Control Technologies
  16. Harvest Aids Soybeans
  17. Important Soybean Stages for Harvest Aids
  18. Harvest Aids
  19. GRAIN SORGHUM WEED CONTROL UPDATE - 2020
  20. Grain Sorghum Weed Control
  21. Grain Sorghum Weed Control - 2018
  22. Grain Sorghum - 2017
  23. A New Product to Consider?
  24. Grain Sorghum - 2017
  25. Huskie Injury on Sorghum
  26. Other Sorghum Options
  27. Inzen Z Grain Sorghum
  28. Inzen Sorghum - 2017
  29. Ratoon Grain Sorghum Demo - 2018 July 27 - 1 DAT
  30. Ratoon Grain Sorghum Demo - 2018 August 14 - 19 DAT
  31. Ratoon Grain Sorghum Demo - 2018 August 22 - 27 DAT
  32. Ratoon Grain Sorghum Demo - 2018 September 4 - 40 DAT
  33. Grain Sorghum After Reflex? (10 month rotation restriction)
  34. Reflex Concentrations in Soil After PRE Applications Under Assorted Mulches
  35. Reflex 2SL @ 12 oz/A Carryover Injury on Grain Sorghum - 2019 (Applied to Bare-Ground)
  36. Reflex 2SL @ 12 oz/A Carryover Injury on Grain Sorghum - 2019 (Applied to Bare-Ground)
  37. Grain Sorghum Fresh Weight - 14 DAP - Following Herbicides Applied to Bare-Ground - 90 DBP
  38. Grain Sorghum Yield Following Herbicides Applied to Bare-Ground - 90 DBP
  39. Questions/Comments?



SLIDE CONTENTS
  1. 2020 Soybean Weed Control Update Eric P. Prostko Professor and Extension Weed Specialist Dept. Crop & Soil Sciences
  2. Soybean Weed Control (Currently) Start clean, use residuals, timely POST Narrow rows (<30”) Systems Conventional RR (glyphosate) LL (glufosinate) GT27 (glufosinate + glyphosate + isoxaflutole) Xtend (dicamba) Enlist (2,4-D choline)
  3. Soybean Weed Control - 2019 Xtend XtendFlex Liberty Enlist SB-02-19 July 7 53 DAP
  4. Soybean Weed Control - 2018 SB-01-18 July 20 SB-01-18 August 3
  5. Old + Cheap + Still Good (i.e. metribuzin) Not a PPO (Valor or Reflex) Good on pigweed and sicklepod Can be applied PPI Dryland fields? Issues (Be careful!!) soil texture, OM, pH Varieties Rotations TriCor 75DF Metribuzin 75DF
  6. Metribuzin Injury
  7. Soybean Weed Control - 2019 SB-04-19 July 22 69 DAP NTC Tricor 4L @ 8 oz/A (PRE) Roundup Powermax 5.5SL @ 32 oz/A + Reflex 2SL @ 24 oz/A (22 DAP)
  8. Liberty-Link® Soybeans Liberty 2.34SL @ 32-43 oz/A or generics VE-R1 (beginning bloom) 2 applications (5 days apart) (87 oz/A/year total) Tank-mixes with POST grass herbicides may reduce grass control Assure (10-21%); Fusilade (8-12%); Poast (25-41%); Select (4-22%) Residuals still needed 15 GPA, medium-coarse droplet size, small weeds, 9 am - 6 pm
  9. Liberty-Link Soybean Varieties Getting better and better! G13LL-7 and G13LL-44 developed by UGA Soybean Breeding Team Group VII’s AGS 747LL (G13LL-7) AGSouth Southern Harvest 7418LL (G13LL-44) Meherrin Others
  10. Statewide Average Yield of UGA Developed LL Soybeans* *Source: UGA OVT (6 locations/year, irrigated)
  11. 2,4-D/Dicamba Technologies 2,4-D choline dicamba
  12. Enlist Soybeans China approval in Jan 2019 Enlist One 2,4-D choline Enlist Duo 2,4-D choline + glyphosate POST up to R2 (full bloom) 2 apps (12 days) Can be tank-mixed with glufosinate (Liberty) or others Check label/web-sites for restrictions (nozzles, wind speed, buffers, etc.) Varieties for GA????
  13. Xtend Soybeans Xtendimax 2.9SL, Engenia 5SL, FexaPan 2.9SL Dicamba POST up to R1 (beginning bloom) or 45 DAP 2 apps (7 days) Add a residual Tavium 3.38SC dicamba (1.12 ae) + s-metolachlor (2.26 lb) 56.5 oz/A POST up to V4 or 45 DAP tank-mixes Check Xtendimax label/web-sites for tank-mixes and restrictions (nozzles, wind speed, buffers, etc.) Engenia information Photo: Dr. Shaun Casteel, Purdue Univ.
  14. Roundup P-Max @ 28.4 oz/A + Tavium (VG) 56.5 oz + Intact @ 0.5% v/v + Class Act Ridion @ 1% v/v SB-07-18, June 15, 2 DAT, Plot #402
  15. Future Soybean Weed Control Technologies HT3 glufosinate + glyphosate + dicamba Xtendflex MGI mesotrione + glufosinate + isoxaflutole (HPPD)
  16. Harvest Aids Soybeans *Glyphosate and Aim are also labeled (more for weed control than crop dessiccation).
  17. Important Soybean Stages for Harvest Aids R5-BS R6-FS or later R5-R6 = 11-20 days (15 avg.) R6-R7 = 9-30 days (18 avg.)
  18. Harvest Aids Source: Mississippi State Univ.
  19. GRAIN SORGHUM WEED CONTROL UPDATE - 2020 Eric P. Prostko, Ph.D. Professor/Extension Weed Specialist Dept. Crop & Soil Sciences
  20. Grain 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
  21. Grain Sorghum Weed Control - 2018 GS-01-18 July 20 86 DAP Dual Magnum 7.62EC 24 oz/A (PRE) NTC
  22. Grain Sorghum - 2017 SG-02-17 June 8 59 DAP NTC Dual Magnum 7.62EC @ 16 oz/A (PRE) Atrazine 4L @ 48 oz/A (30 DAP) COC @ 1% v/v (30 DAP)
  23. 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)
  24. Grain Sorghum - 2017 SG-02-17 June 8 59 DAP NTC Dual Magnum 7.62EC @ 16 oz/A (PRE) Huskie 2.06EC @ 13 oz/A (30 DAP) Atrazine 4L @ 16 oz/A (30 DAP) AMS Xtra 3.4SL @ 2.5% v/v (30 DAP) NIS @ 0.25% v/v (30 DAP)
  25. Huskie Injury on Sorghum
  26. Other Sorghum Options Sandea/Permit – nutsedge Auxin Herbicides 2,4-D Dicamba Rate/Stage Weed size Injury Off-target movement Newer formulations are better (i.e. less volatile)
  27. Inzen™ Z Grain Sorghum Kansas State Univ. DuPont/Corteva Resistance to POST applications of ALS herbicides Zest (nicosulfuron) Non-GMO Gene from wild genotype of sorghum Varieties for GA? Not yet Stewardship! Inzen™ Cultivar (left row) Conventional Cultivar (right row - dead) Ponder Farm 2012
  28. Inzen Sorghum - 2017 SG-01-17 June 8 59 DAP NTC Cinch 7.64EC @ 16 oz/A (PRE) Zest 75WG @ 0.67 oz/A (30 DAP) Atrazine 4L @ 24 oz/A (30 DAP) COC @ 1% v/v (30 DAP) AMS Xtra 3.4SL @ 2% v/v (30 DAP)
  29. Ratoon Grain Sorghum Demo – 2018 July 27 – 1 DAT Gramoxone @ 3 pts/A + Dual Magnum @ 16 oz/A (Applied 2 days after mowing stalks to ~4’-8” tall)
  30. Ratoon Grain Sorghum Demo – 2018 August 14 - 19 DAT
  31. Ratoon Grain Sorghum Demo – 2018 August 22 - 27 DAT
  32. Ratoon Grain Sorghum Demo – 2018 September 4 - 40 DAT
  33. Grain Sorghum After Reflex? (10 month rotation restriction) **Average ˝-life in south GA soils was 80 to 128 days (~100 days) Potter et al. 2016. J. Agric. Food Chem. 64:5156-5163
  34. Reflex Concentrations in Soil After PRE Applications Under Assorted Mulches *Myakka sand (1% OM, 6.8 pH; 95% sand, 4% silt, 1% clay); Reflex concentration at application was 139-176 µg/kg Source: Reed et al. 2017. Weed Science (FL)
  35. Reflex 2SL @ 12 oz/A Carryover Injury on Grain Sorghum - 2019 (Applied to Bare-Ground) GS-01-19 July 23 14 DAP Rep 4 NTC Reflex 2SL @ 12 oz/A Applied 90 DBP
  36. Reflex 2SL @ 12 oz/A Carryover Injury on Grain Sorghum - 2019 (Applied to Bare-Ground) GS-01-19 August 1 23 DAP Rep 4 NTC Reflex 2SL @ 12 oz/A Applied 90 DBP
  37. Grain Sorghum Fresh Weight - 14 DAP - Following Herbicides Applied to Bare-Ground - 90 DBP grams/3 row feet Treatment LSD (0.10) = 12.8 CV = 28.71 GS-01-19 July 23
  38. Grain Sorghum Yield Following Herbicides Applied to Bare-Ground - 90 DBP Bu/A Treatment LSD (0.10) = 8.9 CV = 10.52 GS-01-19 October 28
  39. Questions/Comments? eprostko@uga.edu gaweed.com