Slide Presentation

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AUTHOR
Eric P. Prostko
Extension Weed Specialist
University of Georgia

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TABLE OF CONTENTS
  1. 2012 Weed Management Update - Field Corn and Grain Sorgum
  2. Field Corn
  3. Atrazine 4L @ 2 qts/A + COC @ 1% v/v
  4. Atrazine 4L @ 2 qts/A + COC @ 1% v/v
  5. Future of Atrazine?
  6. Post-Harvest Palmer Amaranth Populations Must be Managed!
  7. Post-Harvest (Corn) Pigweed Problems
  8. Post-Harvest Control of Palmer Amaranth
  9. Post-Harvest Control of Palmer Amaranth
  10. Capreno
  11. Capreno vs. Laudis (51 DAT)
  12. Sometime In The Near Future
  13. Zidua 85WG
  14. Weed Control in Field Corn with Zidua - 2011
  15. Anthem 2.15L
  16. Weed Control in Field Corn with Anthem - 2011
  17. Corvus 2.63SC
  18. Weed Control in Field Corn with Corvus 2.6SC @ 3 oz/A - 2010
  19. Enlist(tm) Herbicide Tolerant Corn
  20. Grain Sorghum
  21. Grain Sorghum Weed Control
  22. GR-Pigweed Control in Sorghum Macon County (2010)
  23. Reflex/Sorghum (10 month rotation restriction for a good reason!)
  24. Future Concerns/Issues
  25. Questions/Discussion?



SLIDE CONTENTS
  1. Eric P. Prostko, Ph.D. Extension Weed Specialist Dept. Crop & Soil Sciences 2012 Weed Management Update Field Corn and Grain Sorghum
  2. Field Corn For most in GA ……. Atrazine + Glyphosate (RR corn) Ignite/Liberty (LL corn) Steadfast Q Laudis or Capreno Halex GT (glyphosate + Callisto + Dual) If I was King, I would make you spray 1 qt/A Atrazine PRE fb 1.5 qt/A + 1 of the above!
  3. Atrazine 4L @ 2 qts/A + COC @ 1% v/v Applied to 4”-9” Palmer Amaranth (6” average) Photo 13 DAT
  4. Atrazine 4L @ 2 qts/A + COC @ 1% v/v Applied to 4”-9” Palmer Amaranth (6” average) Photo 28 DAT
  5. Future of Atrazine? In April 2010, EPA stated that no additional testing is warranted to address the issue of atrazine and amphibian gonadal development. On May 6, 2011, Save The Frogs petitioned the EPA to ban the use and production of atrazine. Public comments were accepted until November 14, 2011 ??
  6. Post-Harvest Palmer Amaranth Populations Must be Managed!
  7. Post-Harvest (Corn) Pigweed Problems Decreasing daylight hastens flower and seed production Flowering (3-4 weeks) Seed production (2-3 weeks) Some germination at 410F (8%) Control Options Mowing/Tillage (>6” weeds) Herbicides (<6” weeds) No small grain Gramoxone + Dual Magnum or Warrant (?) Small Grain planted soon Gramoxone + 2,4-D or dicamba When can we stop worrying about seed production? Keeley et al. 1987. Weed Science 35:199-204 Steckel et al., 2004. Weed Science 52:217-221
  8. Post-Harvest Control of Palmer Amaranth (6” average: 2”-17” range at application) CN-01B-11 September 15 30 DAT NTC Gramoxone Inteon 2SL @ 3 pt/A 2,4-D Amine 3.8SL @ 1 pt/A Primary @ 1% v/v Gramoxone Inteon 2SL @ 3 pt/A Clarity 4SL @ 8 oz/A Primary @ 1% v/v
  9. Post-Harvest Control of Palmer Amaranth (6” average: 2”-17” range at application) CN-01B-11 September 15 30 DAT NTC Gramoxone Inteon 2SL @ 3 pt/A Dual Magnum 7.62EC @ 16 oz/A Primary @ 1% v/v Gramoxone Inteon 2SL @ 3 pt/A Warrant 3ME @ 48 oz/A Primary @ 1% v/v
  10. Capreno Bayer CropScience Thiencarbazone-methyl (0.57 lb/gal) (MOA = 2) Tembotrione (2.88 lbs/gal) (MOA = 27) Laudis Isoxadifen (crop safener) 3.45 SC formulation POST corn OT Up until V1-V6; PDIR – V7 3 oz/A of Capreno 2.5 oz/A Laudis, normal rate is 3 oz/A COC + AMS or UAN OP/ALS Soil Interaction Rotation Restrictions Corn = 0 months; wheat = 4 months; cotton, soybean, sorghum = 10 months; peanut = 12 months; canola, tobacco = 18 months Tank-Mixes Atrazine, Ignite, Glyphosate
  11. Capreno vs. Laudis (51 DAT) NTC Capreno 3.45SC @ 3 oz/A MSO @ 1% v/v AMS Xtra @ 2.5% v/v Laudis 3.5SC @ 3 oz/A MSO @ 1% v/v AMS Xtra @ 2.5% v/v CN-14-10 Applied 19 DAP
  12. Sometime In The Near Future Isoxaflutole (Balance) + Thiencarbazone + Crop safener BASF FMC Bayer DowAgrosciences
  13. Zidua 85WG Pyroxasulfone (KIH-485) Residual control of annual grasses and certain broadleaf weeds including pigweed Same MOA as Dual or Warrant but used at lower rates Use rate: 1-2 oz/A March 2012???
  14. Weed Control in Field Corn with Zidua - 2011 CN-11-11 May 11 47 DAT NTC Zidua 85WG @ 2 oz/A (PRE)
  15. Anthem 2.15L Cadet (0.0632 lb/gal) + Pyroxasulfone (2.0868 lb/gal) Residual control of annual grasses and certain broadleaf weeds including pigweed Use rate: 3.5-7.0 oz/A (?)
  16. Weed Control in Field Corn with Anthem - 2011 CN-14-11 June 6 60 DAP NTC Anthem 2.15SL @ 5 oz/A (EPOST) Roundup W-Max 5.5SL @ 22 oz/A (EPOST) Roundup W-Max 5.5SL @ 22 oz/A (MPOST)
  17. Corvus 2.63SC 3.33 oz/A PRE or EPOST (V2) Tank-Mixtures Atrazine, Ignite, Glyphosate No adjuvants needed 0.75 lbs/gal - thiencarbazone (MOA = 2) 1.88 lbs/gal - isoxaflutole (MOA = 27) Balance Flexx 1.25 lbs/gal - cyprosulfamide (safener) ALS/OP Interaction Problem Rotations Field corn = 0 months; soybean = 9 months; cotton = 10 months; peanut = 12 months; canola, sorghum, tobacco = 17 months
  18. Weed Control in Field Corn with Corvus 2.6SC @ 3 oz/A - 2010 NTC PRE (0 DAP) EPOST (13 DAP) CN-02-10 May 11, 2010 47 DAP
  19. Enlist™ Herbicide Tolerant Corn tolerance to 2,4-D and Assure Colex-D™ technology 2,4-D choline lower volatility lower drift potential enhanced handling/mixing characteristics reduced odor 1 PRE application + 2 POST applications (V8 stage) Enlist™ Duo DMA-Glyphosate (1.71 lb ae/gal) + 2,4-D choline (1.63 lb ae/gal) 3.5 pt/A 2013 Product Launch
  20. Grain Sorghum
  21. GRAIN SORGHUM WEED CONTROL Concep treated seed Dual Magnum or Intrro/Micro-Tech or Warrant (PRE) Atrazine (POST) Paraquat (Hooded sprayer)
  22. GR-Pigweed Control in Sorghum Macon County (2010) – 47 DAP NTC Concep Treated Seed Dual Magnum 7.62EC @ 1 pt/A (PRE) Atrazine 4L @ 1.5 qt/A + COC @ 1% v/v (16 DAP) SG-01-10 JUNE 7
  23. Reflex/Sorghum (10 month rotation restriction for a good reason!)
  24. Future Concerns/Issues ABUSE of Ignite/Liberty Increased use of Dual Magnum and Warrant Increased use of PPO herbicides Valor and Reflex
  25. Questions/Discussion? www.gaweed.com