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2013 Field Corn/Grain Sorghum Weed Management Update
AUTHOR
Eric P. Prostko
Professor and Extension Weed Specialist
University of Georgia
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TABLE OF CONTENTS
2013 Field Corn/Grain Sorghum Weed Management Update
Field Corn - For most in Ga, Atrazine + ...
Benefits of Atrazine (1 qt/A) Applied PRE - 18 DAT
The Power of a PRE Herbicide
Field Corn Weed Control - 2012
Field Corn Weed Control - 2012
Field Corn Weed Control - 2012
Corn Yield As Influenced By POST Herbicide Treatment - 2012
Capreno
POST Capreno Injury - 5 DAT. Did it matter?
Corn Yield As Influenced By POST Applied Halex GT and Capreno - 2012
Zidua 85WG
Weed Control in Field Corn with Zidua Programs - 2012
Residual Weed Control with Zidua - 5 WAT
Anthem 2.15SE and Anthem ATZ 4.5SE
Weed Control in Field Corn with Anthem/Anthem ATZ - 2012
Enlist™ Herbicide Tolerant Corn
Post-Harvest Palmer Amaranth Populations Must be Managed!
Post-Harvest (Corn) Pigweed Problems
Pigweed
TSW Control in Field Corn
Tropical Spiderwort Control in Field Corn - 2005
Post-Harvest Control of Tropical Spiderwort
Morningglory Control in Corn
Grain Sorghum
GRAIN SORGHUM WEED CONTROL
GR-Pigweed Control in Sorghum Macon County (2010) - 47 DAP
Reflex/Sorghum (10 month rotation restriction for a good reason!)
Inzen™ Z Grain Sorghum
Inzen™ Z Grain Sorghum - 2012
Popular Herbicides That We Must Protect From Resistance
Questions/Discussion?
SLIDE CONTENTS
Eric P. Prostko, Ph.D. Professor and Extension Weed Specialist Dept. Crop & Soil Sciences 2013 Field Corn/Grain Sorghum Weed Management Update
Field Corn For most in GA ……. Atrazine + Glyphosate (RR corn) 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!
Benefits of Atrazine (1 qt/A) Applied PRE – 18 DAT 0 Pigweed/ft2 8 Pigweed/ft2 (348,480/A)
The Power of a PRE Herbicide CN-13-12 April 24 28 DAT NTC Dual II Magnum 7.64EC 1 pt/A (PRE) Atrazine 4L 1 qt/A (PRE)
Field Corn Weed Control - 2012 CN-11-12 May 11 39 DAP NTC Atrazine @ 32 oz/A (PRE) fb Roundup WM @ 22 oz/A (29 DAP) Atrazine @ 48 oz/A (29 DAP) Atrazine @ 32 oz/A (PRE) fb Liberty @ 29 oz/A (29 DAP) Atrazine @ 48 oz/A (29 DAP) AMS XTRA @ 2.5% v/v (29 DAP)
Field Corn Weed Control - 2012 CN-11-12 May 11 39 DAP NTC Atrazine @ 32 oz/A (PRE) fb Steadfast Q @ 1.5 oz/A (29 DAP) Atrazine @ 48 oz/A (29 DAP) COC @ 1% v/v (29 DAP) Atrazine @ 32 oz/A (PRE) fb Halex GT @ 3.6 pt/A (29 DAP) Atrazine @ 48 oz/A (29 DAP) COC @ 1.0% v/v (29 DAP)
Field Corn Weed Control - 2012 CN-11-12 May 11 39 DAP NTC Capreno @ 3 oz/A (22 DAP) Atrazine @ 48 oz/A (22 DAP) COC @ 1% v/v (22 DAP) AMX XTRA @ 2.5% v/v (22 DAP)
Corn Yield As Influenced By POST Herbicide Treatment - 2012 Treatment Bu/A LSD 0.10 = 24 CV = 10 CN-12-12 Ponder Farm
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
POST Capreno Injury - 5 DAT Did it matter? CN-08-12 April 11
Corn Yield As Influenced By POST Applied Halex GT and Capreno - 2012 LSD (0.10) = 27 CV = 15 LSD (0.10) = 30 CV = 16 LSD (0.10) = 30 CV = 14 LSD (0.10) = 24 CV = 10 Bu/A Trial
Zidua 85WG PPI, PRE, EPOST (V4) 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. May also be better on FL beggarweed ? Use rates: 1.0-2.75 oz/A $6.50/oz? Registered June 2012
Weed Control in Field Corn with Zidua Programs - 2012 CN-08-12 May 16 29 Days after POST NTC Zidua 85WG @ 2 oz/A (PRE) Status 56WG @ 5 oz/A (POST) Roundup WM 5.5SL @ 22 oz/A (POST) NIS @ 0.25% v/v (POST) AMS XTRA @ 2.5% v/v (POST)
Residual Weed Control with Zidua – 5 WAT NTC Zidua 85 WG @ 1.5 oz/A NC-05-11
Anthem 2.15SE Cadet (0.0632 lb/gal) + Zidua (pyroxasulfone) (2.0868 lb/gal) Residual control of annual grasses and certain broadleaf weeds including pigweed Use rate: 3.5-8.0 oz/A (?) Anthem ATZ 4.5SE Cadet (0.014 lb/gal) + Zidua (pyroxasulfone) (0.475 lb/gal) + Atrazine (4.011 lb/gal) 1.75-2.5 pt/A Registered on ??
Weed Control in Field Corn with Anthem/Anthem ATZ - 2012 CN-12-12 July 26 115 DAP NTC Anthem 2.15SE @ 8 oz/A (PRE) fb Roundup WM 5.5SL @ 22 oz/A (29 DAP) Anthem ATZ 4.5SE @ 2 pt/A + Roundup WM 5.5SL @ 22 oz/A (18 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 (Mid-West)
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
TSW Control in Field Corn Depends on planting date 2,4-D or Aim – POST Sequence + Atrazine or Expert in RR corn Aim/Gramoxone/Evik + Dual Magnum – layby Post-harvest may be more important than in-crop Tillage 2 applications of 2,4-D, Gramoxone, or Aim
Tropical Spiderwort Control in Field Corn - 2005 Untreated (166 bu/A) Aim 2EC @ 1.5 ozs/A Dual Magnum 7.62EC @ 1.33 pt/A Herbimax @ 1% v/v (168 bu/A) 34 DAT
Post-Harvest Control of Tropical Spiderwort Untreated 2,4-D @ 1.5 pt/A POST1 + POST 2 ($14.41/A) POST1: 8-10” tall COMBE POST2: 2 weeks later Photo 1 week after POST2
Morningglory Control in Corn as much atrazine as possible 1.0 lb/A – PRE fb 1.5 lb/A – POST small grain rotations 2,4-D, Clarity, Status, Aim, ET Liberty-Link® Corn Systems split applications of glyphosate (RR corn) * 1st application + atrazine Harvest Aids Aim Early harvest
Grain Sorghum
GRAIN SORGHUM WEED CONTROL Start clean! 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!)
Inzen™ Z Grain Sorghum Kansas State Univ. DuPont Resistance to POST applications of ALS herbicides Non-GMO ALS-resistant shattercane Dual/Cinch PRE a must in my opinion Concep treated seed Stewardship!!! Inzen™ Cultivar (left row) Conventional Cultivar (right row - dead) Ponder Farm 2012
Inzen™ Z Grain Sorghum – 2012 (Inzen – left row; Conventional – right row) SG-01-12 July 9 36 DAT NTC Accent 75DG @ 0.5 oz ai/A Rimsulfuron 25SG @ 0.25 oz ai/A Atrazine 4L @ 32 oz/A COC @ 1% v/v 28-0-0 @ 2 qt/A (3.33% v/v)
Popular Herbicides That We Must Protect From Resistance
Questions/Discussion? www.gaweed.com