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

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TABLE OF CONTENTS
  1. 2015 Soybean Weed Control Update
  2. Prefix - PRE / Roundup + Classic - POST
  3. Narrow Rows and Weed Control - Soybeans
  4. Just thinking???
  5. STS/SR Soybeans (sulfonylurea tolerant, sulfonylurea ready)
  6. Don't forget about metribuzin on soybean?
  7. Metribuzin Based Soybean Weed Control Program - 2014
  8. For Growers in Peanut/Cotton Rotations Who Want to Protect Valor and Reflex
  9. Soybean Weed Control - 2014
  10. Soybean Weed Control - 2014
  11. Warrant Injury on Soybean??
  12. Liberty-Link Soybeans
  13. Weed Control in LL Soybeans
  14. Liberty-Link Soybean Variety Rankings - 2014 UGA Irrigated Variety Trials
  15. This Must Be Stopped!!! Liberty on Large Pigweed!!!!!
  16. Do early applications of Cobra increase soybean yields?
  17. What about Morningglory?
  18. Reflex @ 16 oz/A + Classic @ 0.5 oz/A + Clethodim @ 20 oz/A + 80/20 @ 0.25% v/v - 3 DAT.
  19. Future Technologies
  20. Enlist Herbicide Tolerant Soybean
  21. Enlist Soybeans - 2012
  22. Enlist Duo Label Requirements (10-09-14)
  23. Enlist Duo Nozzle Tips/Pressure
  24. Enlist Duo Sprayer Cleanout
  25. Dicamba-Tolerant (DT) Soybeans
  26. Roundup Xtend - 2014
  27. Engenia Program - DT Soybeans 2014
  28. 2,4-D and Dicamba Tolerant Soybeans
  29. 2,4-D and Dicamba Soybeans Stewardship
  30. On the Next Horizon
  31. MGI Soybeans - 2014
  32. The Tank-Mixes Blues!
  33. QUESTIONS?



SLIDE CONTENTS
  1. 2015 Soybean Weed Control Update Eric P. Prostko Professor and Extension Weed Specialist Dept. Crop & Soil Sciences
  2. Decatur County July 29, 2014 Prefix – PRE Roundup + Classic – POST (strip-till wheat stubble)
  3. Narrow Rows and Weed Control - Soybeans “A review of row spacing experiments in which an initial weed management practice had been accomplished revealed that in 64% of the cases (72 of 113 site-years), less late-season weed density and/or biomass, or greater late-season weed control, was achieved in narrow- compared to wide-row soybean production systems.” Bradley, K. W. 2006. A review of the effects of row spacing on weed management in corn and soybean. Online. Crop Management doi:10.1094/CM-2006-0227-02-RV.
  4. Just thinking??? Fierce or Valor or Envive or Valor XLT (PRE) followed by Reflex (POST) = great pigweed control but not great ……. Resistance Management PPO followed by PPO Not great in cotton and peanut rotations relying on Valor and Reflex Might be OK in corn/soybean rotation when no PPO is used in corn
  5. STS/SR Soybeans (sulfonylurea tolerant, sulfonylurea ready) May want to consider these if using Envive or Canopy Help minimize PRE injury from Classic in adverse conditions (i.e. cool, wet)
  6. Don’t forget about metribuzin on soybean? 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 Company support Lack of incentive at dealer level TriCor 75DF Metribuzin 75DF
  7. Metribuzin Based Soybean Weed Control Program - 2014 NTC Boundary – PRE Flexstar GT - POST SB-14-14 July 24 66 DAP
  8. For Growers in Peanut/Cotton Rotations Who Want to Protect Valor and Reflex RR Soybeans Warrant or Dual Magnum or Zidua or Anthem fb Glyphosate + Reflex (Flexstar GT) or Glyphosate + Prefix/Statement Tricor or Boundary or Canopy or Authority MTZ (metribuzin herbicides) fb Glyphosate + Reflex (Flexstar GT) or Glyphosate + Prefix/Statement LL Soybeans Warrant or Dual Magnum or Zidua or Anthem fb Liberty + Reflex or Prefix/Statement Reflex or Valor or Prefix fb Liberty + Warrant or Dual Magnum or Zidua or Anthem No metribuzin on LL varieties Herbicide Resistance?
  9. Dual (PRE) Gly + Reflex (POST) 46 Bu/A Warrant (PRE) Gly + Reflex (POST) 46 Bu/A NTC Soybean Weed Control - 2014 SB-12-14, July 7 13 Days after POST
  10. Soybean Weed Control - 2014 NTC Dual Magnum @ 16 oz/A (PRE) Roundup W-Max @ 22 oz/A (POST) Reflex @ 24 oz/A (POST) SB-14-14 July 22 64 DAP
  11. Warrant Injury on Soybean??
  12. Liberty-Link® Soybeans Liberty 2.34SL @ 22-36 oz/A VE-R1 2 applications (65 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 Variety performance? Getting better **Best Results 15 GPA, medium droplet size, small weeds, 9 am - 6 pm
  13. Weed Control in LL Soybeans SB-23-13 July 17 64 DAP NTC Dual Magnum @ 16 oz/A (PRE) Liberty @ 29 oz/A (MPOST) Reflex @ 16 oz/A (MPOST)
  14. Liberty-Link Soybean Variety Rankings 2014 UGA Irrigated Variety Trials 11/25/2014
  15. This Must Be Stopped!!! Liberty on Large Pigweed!!!!!
  16. Do early applications of Cobra increase soybean yields? Nebraska (2013) Decreases in yield were observed by destroying apical meristem by both clipping at V2 and applications of Cobra Arkansas V3 stage 21% increase in yield (2011) No difference in yield (2012) Iowa (2011) V2.5 stage No positive effect Multi-State (MN, WI, MI, IA, KS, IL, IN, AR, KY) 2012 V4 stage No positive effect from Cobra alone Increased yield with SOYA + Cobra (+8.9%) but not different from SOYA alone. Mississippi (2014) V2 stage No effect on nodes, heights, or yield
  17. What about Morningglory? Metribuzin – PRE Tricor, Canopy, Boundary Glyphosate + Reflex/Prefix + Classic or FirstRate 3 way tank-mix????? Glyphosate + Reflex/Prefix fb Roundup + Classic or Firstrate Liberty
  18. Reflex @ 16 oz/A + Classic @ 0.5 oz/A + Clethodim @ 20 oz/A + 80/20 @ 0.25% v/v – 3 DAT.
  19. Future Technologies 2,4-D resistance Dicamba resistance “Balance” beans MGI soybeans
  20. Enlist™ Herbicide Tolerant Soybean tolerance to 2,4-D + glyphosate + glufosinate (Liberty) Trait was deregulated in September 2014 and herbicide in October 2014 Colex-D™ technology 2,4-D choline lower volatility lower drift potential enhanced handling/mixing characteristics reduced odor 1 Burndown/PRE application + 2 POST applications (R2 stage) Enlist™ Duo DMA-Glyphosate (1.7 lb ae/gal) + 2,4-D choline (1.6 lb ae/gal) – (3.5-4.75 pt/A) 2015 Product Launch IA, IL, IN, OH, SD, WI (first) AR, KS, LA, MN, MO, MS, NE, ND, OK, TN, (next) 2,4-D choline
  21. Enlist Soybeans - 2012 NTC Valor SX 51WG - PRE (May 4) Enlist Duo - MPOST (June 1) N-PAK AMS - MPOST (June 1) SB-09-12 Planted May 3 Photo: June 29
  22. Enlist™ Duo Label Requirements (10-09-14) Can only use nozzles and pressure listed on label (chart) Winds speeds < 15 MPH 30’ downwind buffer from sensitive areas Wind cannot be blowing toward adjacent tomatoes, other fruiting vegetables (Crop Group 8), cucurbits (Crop Group 9), grapes, and cotton Specific sprayer clean-out directions
  23. Enlist™ Duo Nozzle Tips/Pressure
  24. Enlist™ Duo Sprayer Cleanout
  25. Dicamba-Tolerant (DT) Soybeans Monsanto/BASF Roundup Ready 2 Xtend (Monsanto) XtendiMax Reduced volatility dicamba Roundup Xtend Reduced volatility dicamba + glyphosate Engenia™ (BASF) Reduced volatility formulation of dicamba Banvel = dicamba-DMA Clarity = dicamba-DGA Engenia = dicamba–BAPMA PRE or POST RESIDUAL STILL NEEDED!!!!!!!!!!!!!!!!!!!!!!! Could be registered in 2015 but will not likely be sold until 2016 (China issues)?
  26. Roundup Xtend - 2014 SB-10-14 July 21 D after POST NTC Valor – PRE Roundup Xtend - POST
  27. Engenia Program – DT Soybeans 2014 (EPOST Applied 13 DAP) NTC Roundup P-Max + Induce EPOST Prowl H20 – PRE Zidua + Roundup P-Max + ENGENIA + Induce EPOST New-2014, July 14 27 d after EPOST
  28. 2,4-D and Dicamba Tolerant Soybeans Still need a residual! Still need to be timely (3-4” tall weeds)! Will also need Liberty! Not on Xtend beans though! Must significantly improve in the areas of drift and sprayer contamination management
  29. 2,4-D and Dicamba Soybeans Stewardship Droplet size (VMD) Nozzle selection Pressure GPA Tractor speed Boom Height Wind Speed/Direction Buffers Sprayer cleanout
  30. On the Next Horizon HPPD resistant soybeans Bayer/MS Technologies “Balance” beans Glyphosate + isoxaflutole 2015????? Syngenta + Bayer “MGI” beans Mesotrione (Callisto) Glufosinate (Liberty) Isoxaflutole (Balance) 2015-2020????
  31. MGI Soybeans - 2014 NTC Zemax – PRE Flexstar GT - POST Zemax = Dual Magnum + Callisto
  32. The Tank-Mixes Blues! Reflex + Zidua + B-Moly Glyphosate + Brandt Smart Trio (N + S + B + Mn + Zn) *Always pre-slurry dry formulations in water before adding to tank!!!
  33. QUESTIONS? www.gaweed.com