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2012 Weed Management Update - Field Corn and Grain Sorgum
AUTHOR
Eric P. Prostko
Extension Weed Specialist
University of Georgia
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TABLE OF CONTENTS
2012 Weed Management Update - Field Corn and Grain Sorgum
Field Corn
Atrazine 4L @ 2 qts/A + COC @ 1% v/v
Atrazine 4L @ 2 qts/A + COC @ 1% v/v
Future of Atrazine?
Post-Harvest Palmer Amaranth Populations Must be Managed!
Post-Harvest (Corn) Pigweed Problems
Post-Harvest Control of Palmer Amaranth
Post-Harvest Control of Palmer Amaranth
Capreno
Capreno vs. Laudis (51 DAT)
Sometime In The Near Future
Zidua 85WG
Weed Control in Field Corn with Zidua - 2011
Anthem 2.15L
Weed Control in Field Corn with Anthem - 2011
Corvus 2.63SC
Weed Control in Field Corn with Corvus 2.6SC @ 3 oz/A - 2010
Enlist(tm) Herbicide Tolerant Corn
Grain Sorghum
Grain Sorghum Weed Control
GR-Pigweed Control in Sorghum Macon County (2010)
Reflex/Sorghum (10 month rotation restriction for a good reason!)
Future Concerns/Issues
Questions/Discussion?
SLIDE CONTENTS
Eric P. Prostko, Ph.D. Extension Weed Specialist Dept. Crop & Soil Sciences 2012 Weed Management Update Field Corn and Grain Sorghum
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!
Atrazine 4L @ 2 qts/A + COC @ 1% v/v Applied to 4-9 Palmer Amaranth (6 average) Photo 13 DAT
Atrazine 4L @ 2 qts/A + COC @ 1% v/v Applied to 4-9 Palmer Amaranth (6 average) Photo 28 DAT
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 ??
Post-Harvest Palmer Amaranth Populations Must be Managed!
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
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
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
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
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
Sometime In The Near Future Isoxaflutole (Balance) + Thiencarbazone + Crop safener BASF FMC Bayer DowAgrosciences
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???
Weed Control in Field Corn with Zidua - 2011 CN-11-11 May 11 47 DAT NTC Zidua 85WG @ 2 oz/A (PRE)
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 (?)
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)
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
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
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
Grain Sorghum
GRAIN SORGHUM WEED CONTROL Concep treated seed Dual Magnum or Intrro/Micro-Tech or Warrant (PRE) Atrazine (POST) Paraquat (Hooded sprayer)
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
Reflex/Sorghum (10 month rotation restriction for a good reason!)
Future Concerns/Issues ABUSE of Ignite/Liberty Increased use of Dual Magnum and Warrant Increased use of PPO herbicides Valor and Reflex
Questions/Discussion? www.gaweed.com