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

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TABLE OF CONTENTS
  1. 2,4-D and Dicamba Resistant Soybeans in the Southeast
  2. Public Service Announcement
  3. Do we have to have this new technology?
  4. Soybean Weed Control August 13, 2015 (99 DAP)
  5. 2,4-D/Dicamba Technologies
  6. What was/is causing the delay?
  7. Enlist Herbicide Tolerant Soybean
  8. Enlist Soybeans - 2012
  9. Dicamba-Tolerant (DT) Soybeans
  10. Roundup Xtend - 2014
  11. Engenia Program - DT Soybeans 2014 (EPOST Applied 13 DAP)
  12. How good are dicamba and 2,4-D on Palmer Amaranth?
  13. Dicamba/2,4-D Symptomology
  14. Formulation Improvements
  15. Cotton Injury (%) From 2,4-D Volatiles for 48 hours Under Plastic Tunnels (21-28 DAT)
  16. Why Engenia Herbicide? A stepwise improvement in reduced volatility
  17. Less drift potential and less volatility does not mean 0 drift or volatility!!!
  18. 2,4-D and Dicamba Crops (Don’t Get Messed Up!)
  19. Droplet Size
  20. Micron
  21. Volume Median Diameter (VMD)
  22. Table 1. Spray Droplet Size Classification
  23. VMD50 for Common Nozzle Types
  24. Boom Height- Auto-Boom
  25. Sprayer Cleanout- Is it possible in this rig?
  26. Enlist Duo- Label Sprayer Cleanout
  27. What happened in 2015 and what will happen in 2016?
  28. Variety Performance?????
  29. 2,4-D and Dicamba Tolerant Crops
  30. Read The Labels!!!!!!!
  31. 2016 Auxin Trainings "Using Pesticides Wisely"
  32. QUESTIONS?



SLIDE CONTENTS
  1. 2,4-D and Dicamba Resistant Soybeans in the Southeast Eric P. Prostko Professor and Extension Weed Specialist Dept. Crop & Soil Sciences 2016 Soybean Expo
  2. Public Service Announcement UGA weed scientists are not actively promoting the use of 2,4-D or dicamba resistant crop technologies over any other technology or herbicide. If GA growers decide to use these technologies, UGA weed scientists and extension agents will provide the best possible educational programs and technical support to ensure safe and effective use.
  3. Do we have to have this new technology? PPO’s still working? Reflex, Valor When will Liberty crash and burn? Dryland production Residual activation
  4. Soybean Weed Control August 13, 2015 (99 DAP) NTC NTC NTC SB-01-15 Started clean Dual Magnum (PRE) 0.5” irrigation (1 DAT) Roundup WM + Reflex or Prefix + Classic or FirstRate (23 DAP)
  5. 2,4-D/Dicamba Technologies 2,4-D dicamba
  6. What was/is causing the delay? Endangered Species Act GA has 63 species China Leading importer of soybean and cotton
  7. 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
  8. 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
  9. Dicamba-Tolerant (DT) Soybeans Monsanto/BASF Roundup Ready XTEND Crop System Roundup Ready 2 XTEND- soybeans Glyphosate + dicamba resistance Herbicides XtendiMax (with Vapor Grip) Reduced volatility dicamba 12.8 oz/A (0.5 lb ae/A dicamba) Roundup Xtend (with Vapor Grip) Reduced volatility dicamba + glyphosate 48 oz/A (1 lb ae glyphosate + 0.5 lb ae dicamba) Engenia™ (BASF) dicamba–BAPMA 12.8 oz/A (0.5 lb ae/A) PRE or POST (R1) RESIDUAL STILL NEEDED!!!!!!!!!!!!!!!!!!!!!!!
  10. Roundup Xtend - 2014 SB-10-14 July 21 D after POST NTC Valor – PRE Roundup Xtend - POST
  11. 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
  12. How good are dicamba and 2,4-D on Palmer Amaranth? SB-10-15 July 7 35 DAT AMAPA – 1-8” tall NTC Roundup PM @ 22 oz/A Clarity @ 16 oz/A Roundup PM @ 22 oz/A Cobra @ 16 oz/A COC @ 1% v/v 15 GPA TTI02 tips
  13. Dicamba/2,4-D Symptomology
  14. Formulation Improvements Volatility has always been a big issue/concern with auxin herbicides. Newer formulations of 2,4-D and dicamba are significantly less volatile than older formulations. OLDER FORMULATIONS WILL NOT BE LABELED FOR USE IN AUXIN SYSTEMS!!!!! Less volatility (i.e. vapor drift) does not mean less physical drift!!!!
  15. Cotton Injury (%) From 2,4-D Volatiles for 48 hours Under Plastic Tunnels (21-28 DAT) Source: Sosnoskie et al. 2015. Weed Technology 29:177-184 (UGA) *83% reduction *93% reduction
  16. Less drift potential and less volatility does not mean 0 drift or volatility!!!
  17. 2,4-D and Dicamba Crops (Don’t Get Messed Up!) 1Dicamba is already registered for use in field corn (up to a certain point). Not sure at this point if new formulations will be specifically labeled.
  18. Droplet Size
  19. Micron micron (µm) is a unit of measure equivalent to 1/25,000 of an inch.
  20. 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
  21. Table 1. Spray Droplet Size Classification1. 1Estimated from sample reference graph in ASBAE/ANSI/ASAE Standard S572.1 2VMD = Volume median diameter
  22. 11002DG VMD50 = 322 (C) AIXR 11002 VMD50 = 402 (VC) TTI 02 VMD50 = 524 (XC) VMD50 for Common Nozzle Types ?
  23. Boom Height Auto-Boom
  24. Sprayer Cleanout Is it possible in this rig?
  25. Enlist™ Duo Label Sprayer Cleanout
  26. What happened in 2015 and what will happen in 2016?
  27. Variety Performance?????
  28. 2,4-D and Dicamba Tolerant Crops Start clean! Still need a residual! Maybe 2??? Still need to be timely (3-4” tall weeds)! GA growers must significantly improve in the areas of drift and sprayer contamination management
  29. Read The Labels!!!!!!!
  30. 2016 Auxin Trainings “Using Pesticides Wisely” Required by GA Dept. of Ag Feb 22:  Turner/Bacon Feb 23:  Dooly/Dodge Feb 23: Brooks/Mitchell Feb 29: Early/Terrell Feb 29: Toombs-Tattnall/Screven Mar 1: Washington/Emanuel Mar 1: Gordon/Madison   One-on-One follow ups with UGA County Extension Agent (voluntary)    
  31. QUESTIONS? eprostko@uga.edu www.gaweed.com