Slide Presentation

TITLE    (click title to view slides)
2014 Soybean Weed Control Update

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

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TABLE OF CONTENTS
  1. 2014 Soybean Weed Control Update
  2. Soybean Weed Control Tips
  3. Narrow Rows and Weed Control - Soybeans
  4. Just thinking???
  5. For Growers in Peanut/Cotton Rotations Who Want to Protect Valor and Reflex
  6. Envive Rates/Crop Injury
  7. Soybean Injury Caused by Envive 41.3WG @ 3.5 oz/A 10 DAP
  8. LL-Soybean and Weed Response to Envive SB-02-12
  9. Liberty-Link® Soybeans
  10. Weed Control in LL Soybeans 2013
  11. Yellow Nutsedge Control in Soybeans
  12. Do early applications of Cobra increase soybean yields?
  13. 2014 Pest Control Handbook Additions
  14. Zidua 85WG
  15. Weed Control in Soybeans with Zidua - 2012
  16. Fierce 76WDG
  17. GR-Palmer Control in Soybeans with Fierce - 2012
  18. Future Technologies
  19. Enlist Herbicide Tolerant Soybean
  20. Enlist Soybeans - 2012
  21. Dicamba-Tolerant (DT) Soybeans
  22. Weed Control in Soybeans with Engenia - 2013
  23. 2,4-D and Dicamba Tolerant Soybeans
  24. Volume Median Diameter (VMD)
  25. 2,4-D/Dicamba Soybeans- Understanding spray droplet size will be very important!
  26. Sprayer charts
  27. On the Next Horizon
  28. QUESTIONS?



SLIDE CONTENTS
  1. 2014 Soybean Weed Control Update Eric P. Prostko Professor and Extension Weed Specialist Dept. Crop & Soil Sciences
  2. Start clean! 2 residual herbicides Timely POST applications (<3” weeds) narrow row spacing (if you can) Soybean Weed Control Tips
  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. For Growers in Peanut/Cotton Rotations Who Want to Protect Valor and Reflex RR Soybeans Warrant or Dual Magnum fb Glyphosate + Reflex (Flexstar GT) Tricor or Boundary or Canopy or Authority MTZ (metribuzin herbicides) fb Glyphosate + Reflex (Flexstar GT) LL Soybeans Warrant or Dual Magnum fb Liberty + Reflex Reflex or Valor fb Liberty + Warrant or Dual Magnum No metribuzin on LL varieties Herbicide Resistance?
  6. Envive Rates/Crop Injury Dupont 41.3% WG Classic – 9.2% Valor – 29.2% Harmony – 2.9% Rate range of 2.5-4.0 oz/A I prefer 2.5 oz/A Similar injury situation occurs with Valor XLT Most likely cause is Classic
  7. Soybean Injury Caused by Envive 41.3WG @ 3.5 oz/A 10 DAP NTC Envive SB-21-11
  8. LL-Soybean and Weed Response to Envive SB-02-12 (June 12) NTC Envive 41.3DG @ 3.5 oz/A (PRE) Liberty 2.34SL @ 22 oz/A (POST)
  9. 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
  10. Weed Control in LL Soybeans 2013 SB-23-13 July 17 NTC Dual Magnum @ 16 oz/A (PRE) Liberty @ 29 oz/A (MPOST) Reflex @ 16 oz/A (MPOST)
  11. Yellow Nutsedge Control in Soybeans How competitive? 2.2-13 plants/m2 = 9-34% yield loss Nelson and Smoot (2010) Weed Technol. 24:39-43 Herbicides Dual Magnum – PRE + Classic or Basagran – POST Classic = 3-4” tall Basagran = up to 8”, 2 applications
  12. 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.
  13. 2014 Pest Control Handbook Additions (pyroxasulfone) (Valor + Zidua)
  14. Zidua 85WG Pyroxasulfone Residual control of annual grasses and certain broadleaf weeds including pigweed (beggarweed?) Same MOA as Dual or Warrant but used at lower rates Use rate: 1-2 oz/A (~$6.50/oz)
  15. Weed Control in Soybeans with Zidua - 2012 SB-01-12 August 13 83 DAP NTC Zidua 85WG @ 2 oz/A – PRE Abundit 4SL @ 32 oz/A – POST AMS Xtra @ 2.5% v/v - POST
  16. Fierce 76WDG Valor (33.5%) + Pyroxasulfone (42.5%) preplant or preemergence 3 oz/A on coarse soils (Valor @ 2 oz/A + Pyrox @ 1.5 oz/A) March 2013
  17. GR-Palmer Control in Soybeans with Fierce – 2012 SB-10-12 August 9 78 DAP NTC Fierce 76WG @ 3 oz/A - PRE Roundup WM 5.5SL @ 22 oz/A – POST (June 20)
  18. Future Technologies 2,4-D resistance Dicamba resistance
  19. Enlist™ Herbicide Tolerant Soybean tolerance to 2,4-D + glyphosate + glufosinate (Liberty) 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 (1.71 lb ae/gal) + 2,4-D choline (1.63 lb ae/gal) 3.5 pt/A 2015 Product Launch (MG 3.8) Pioneer License 2,4-D choline
  20. Enlist Soybeans - 2012 NTC Valor SX 51WG @ 2 oz/A – PRE (May 4) Enlist Duo (GF-2726) @ 56 oz/A – MPOST (June 1) N-PAK AMS @ 2.5% v/v - MPOST (June 1) SB-09-12 Planted May 3 Photo: June 29
  21. 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!!!!!!!!!!!!!!!!!!!!!!! 2015-2016? Engenia™
  22. Weed Control in Soybeans with Engenia - 2013 Newsome July 30, 2013 39 Days after POST NTC Zidua @ 2 oz/A (PRE) Engenia @ 12.8 oz/A (POST) Roundup PowerMax @ 28 oz/A (POST) Induce @ 0.25% v/v (POST)
  23. 2,4-D and Dicamba Tolerant Soybeans Still need a residual! Still need to be timely (3-4” tall weeds)! Will also need Ignite! Not on Xtend beans though! Must significantly improve in the areas of drift and sprayer contamination management
  24. Volume Median Diameter (VMD) value where 50% of the total volume or mass of liquid sprayed is made up of droplets larger than this value, and 50% is made up of droplets smaller than this value. Dv0.5 Measured in microns
  25. 2,4-D/Dicamba Soybeans Understanding spray droplet size will be very important!
  27. 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????
  28. QUESTIONS? www.gaweed.com