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2016 Field Corn Weed Management Update
AUTHOR
Eric P. Prostko
Professor and Extension Weed Specialist
University of Georgia
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TABLE OF CONTENTS
2016 Field Corn Weed Management Update
Nematodes and Early Season Herbicide Injury
Nematode Control
Atrazine + Any of these works just fine!
(Atrazine 4L @ 32 oz/A - PRE fb & Roundup WM @ 22 oz/A + Atrazine @ 48 oz/A - Applied 21 DAP
Anthem, Dual, Warrant, Zidua????
PRE Applied Zidua, Dual II Magnum, and Warrant in Field Corn - 2015
Chloroacetamide Injury on Field Corn (Dual, Warrant, Zidua)
Pay Closer Attention to Hybrid/Herbicide Mgt. Guidelines
Something to think about?
Herbicide and High Yield Corn
Herbicide Effects on Field Corn Yield in a High Input Environment
Roundup W-Max + Atrazine + AMS Xtra Timing Effects on Field Corn Yield in a High Input Environment - YEAR 2
Corn Stage of Growth
Valor Drift on Field Corn
Valor Injury - Applied V6
Valor @ 3 oz/A Applied at V5-V6
Field Corn (Pioneer 1794) Yield Response to Valor 51WG (oz/A) - 2015
Morningglory Control in Field Corn
Morningglory Control in Corn
Do we need to rethink laybys????
Do we need to rethink laybys????
New (er) Stuff
Acuron
Acuron - 2015
Revulin Q
Revulin Q - 2015
Enlist™ Herbicide Tolerant Corn
Enlist Duo Recent Problems
Question/Comments
SLIDE CONTENTS
Eric P. Prostko Professor/Extension Weed Specialist Dept. Crop & Soil Sciences 2016 Field Corn Weed Management Update
Nematodes and Early Season Herbicide Injury
Nematode Control Telone II Seed Treatments Avicta Duo Corn Poncho/Votivo Counter - INFR
Atrazine + Any of these works just fine!
(L) - Non-Treated Control; (R) – Atrazine 4L @ 32 oz/A – PRE fb Roundup WM @ 22 oz/A + Atrazine @ 48 oz/A – Applied 21 DAP: Photo @ 33 DAP CN-05-15 May 4 (N83D-3000GT)
Anthem, Dual, Warrant, Zidua????
PRE Applied Zidua, Dual II Magnum, and Warrant in Field Corn - 2015 CN-13-15 May 4 33 DAP NTC Zidua 85WG 1.5 oz/A Dual II Magnum 7.62EC 21 oz/A Warrant 3ME 48 oz/A
Chloroacetamide Injury on Field Corn (Dual, Warrant, Zidua) Rate Planting Depth Hybrid Temperature Moisture
Pay Closer Attention to Hybrid/Herbicide Mgt. Guidelines
Something to think about? Some GA growers are pushing yield limits (250+ Bu/A) 75%-80% irrigated At lower yield/input levels, are herbicide stresses masked by other stresses? At higher yield/input levels (i.e. most stresses are controlled), what about herbicides?
Herbicide and High Yield Corn After 2 years of testing various herbicides applied at recommended time (V2-V5) had no effect on corn yield glyphosate + atrazine applied from V2 to V7 had no effect on corn yield
Herbicide Effects on Field Corn Yield in a High Input Environment (RU = Roundup W-Max, ATZ = Atrazine, PW = Prowl, LIB = Liberty, STDQ = Steadfast Q, CAP = Capreno, LAD = Laudis, HGT = Halex GT, SAN = Sandea) – YEAR 2 CN-01-15 Applied 17 DAP V3 (292 GDD) Pioneer 1197 LSD 0.10 = 28 CV = 7.2
Roundup W-Max (32 oz/A) + Atrazine (48 oz/A) + AMS Xtra (2.5% v/v) Timing Effects on Field Corn Yield in a High Input Environment – YEAR 2 CN-02-15 Pioneer 1197 LSD 0.10 = 14 CV = 3.33
Corn Stage of Growth CN-02-15 April 21 32 DAP V7
Valor Drift on Field Corn
Valor Injury – Applied V6 – 3 DAT 3 oz/A 1.5 oz/A 0.75 oz/A 0.375 oz/A 0.188 oz/A CN-02-14 May 1
Valor @ 3 oz/A Applied at V5-V6 Picture taken 6 DAT - 2015
Field Corn (Pioneer 1794) Yield Response to Valor 51WG (oz/A) - 2015 CN-10-15 LSD 0.10 = 16 CV = 4
Morningglory Control in Field Corn
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, Evik (PDIR) Enlist Corn??? Liberty-Link® Corn Systems split applications of glyphosate (RR corn) * 1st application + atrazine Harvest Aids Aim Early-harvest
Do we need to rethink laybys???? CN-06-15 July 29 133 DAP NTC Atrazine 4L @ 32 oz/A (PRE) Roundup WM @ 32 oz/A + Atrazine @ 48 oz/A (21 DAP) Atrazine 4L @ 32 oz/A (PRE) Roundup WM @ 32 oz/A + Atrazine @ 48 oz/A (21 DAP) Evik @ 2 lb/A + NIS (37 DAP)
Do we need to rethink laybys???? CN-06-15 July 29 133 DAP NTC Dual II Magnum @ 16 oz/A (PRE) Roundup WM @ 32 oz/A + Atrazine @ 64 oz/A (21 DAP) Dual II Magnum @ 16 oz/A (PRE) Roundup WM @ 32 oz/A + Atrazine @ 64 oz/A (21 DAP) Evik @ 2 lb/A + NIS (37 DAP)
New (er) Stuff
Acuron Syngenta Dual Magnum + Atrazine + Callisto + bycyclopyrone MOA = 5 + 15 + 27 PRE or EPOST 12” tall Soybean, cotton and peanuts = 10 months 80 oz/A Can tank-mix with glyphosate Price???????
Acuron - 2015 NTC Acuron 3.44CS 80 oz/A (PRE) CN-12-15 May 11 47 DAT
Revulin Q DuPont Accent + Callisto + isoxadifen (safener) MOA = 2 + 27 EPOST (20” tall or V6) 3.4-4.0 oz/A Tank mix with atrazine UGA only has 1 year of data????? Cotton or soybean = 10 months; peanut = 18 months No Counter INFR
Revulin Q - 2015 NTC Revulin Q 51.2WG @ 3.4 oz/A COC @ 1% v/v AMS Xtra @ 2.5% v/v (Applied 22 DAP) CN-11-15 May 15 52 DAP
Enlist™ Herbicide Tolerant Corn tolerance to 2,4-D and Assure + GLY 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 PRE application + 2 POST applications (30” or V8 stage) Enlist™ Duo DMA-Glyphosate (1.71 lb ae/gal) + 2,4-D choline (1.63 lb ae/gal) 2015 Product Launch IA, IL, IN, OH, SD, WI (first) AR, KS, LA, MN, MO, MS, NE, ND, OK, TN (next) Mycogen/Monsanto/Dekalb license???? 2,4-D choline
Enlist Duo Recent Problems
Question/Comments eprostko@uga.edu www.gaweed.com