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2017 Soybean Weed Control Update
AUTHOR
Eric P. Prostko
Professor and Extension Weed Specialist
University of Georgia
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TABLE OF CONTENTS
2017 Soybean Weed Control Update
Soybean Weed Control- How does this happen?
Narrow Rows and Weed Control - Soybeans
US Soybean Row Spacing -2016 (80% of US acres/53.1 Bu/A)
My Program Still Works!
Boundary/Reflex
Liberty Programs - 2016
Bolt Soybeans
Bolt Soybeans - 2016
Canopy or Canopy Blend??
Surveil 48WDG
2,4-D/Dicamba Technologies
Do we have to have this new technology?
Do we have to have the auxin technologies?
Do we have to have the auxin technologies?
Enlist Soybeans (2016)
DT-Soybeans (2016)
Variety Performance?????
2016 University Xtend Soybean Variety Performance
Enlist Duo vs. Xtendimax
Spray Droplet Size Classification
Medium vs. Ultra Coarse Droplets
11002DG, AIXR 11002, TTI 02
Enlist Duo Rec's - 2017 (when labeled)
Enlist Duo States - Current (15)
Approved Enlist Tank-Mix Partners (11/30/2016)
Xtend Soybean Rec's - 2017
Approved Xtendimax Tank-Mix Partners
2,4-D and Dicamba Crops (Don’t Get Messed Up!)
Off-Label Dicamba Use in 2016
Is it worth this?
2,4-D and Dicamba Soybeans- Final Thoughts
2015-2016 Auxin Trainings "Using Pesticides Wisely"
Auxin Resistance- Already Out There!
QUESTIONS?
SLIDE CONTENTS
2017 Soybean Weed Control Update Eric P. Prostko Professor and Extension Weed Specialist Dept. Crop & Soil Sciences
Soybean Weed Control How does this happen? Started Clean Activated soil applied residual herbicide Timely POST Knockdown + residual NTC Dual Magnum - PRE Roundup + Reflex – POST (76 DAP)
Narrow Rows and Weed Control - Soybeans “A review of row spacing experiments in which an initial weed management practice had been accomplished revealed that in 64% of the cases (72 of 113 site-years), less late-season weed density and/or biomass, or greater late-season weed control, was achieved in narrow-row (< 30”) compared to wide-row soybean production systems.” Bradley, K. W. 2006. A review of the effects of row spacing on weed management in corn and soybean. Online. Crop Management doi:10.1094/CM-2006-0227-02-RV.
US Soybean Row Spacing – 2016 (80% of US acres/53.1 Bu/A) Source: USDA/NASS. Crop Production (November 2016)
My Program Still Works! SB-11-16 July 26 62 DAP NTC Dual Magnum 7.62EC @ 21 oz/A (PRE) Roundup P-MAX 5.5SL @ 32 oz/A (30 DAP) Reflex 2SL @ 24 oz/A (30 DAP)
Boundary/Reflex SB-02-16 August 23 102 DAP Boundary 6.5SC @ 24 oz/A (PRE) Roundup PowerMax 5.5SL @ 22 oz/A (28 DAP) Reflex 2SL @ 24 oz/A (28 DAP)
Liberty Programs - 2016 SB-12-16 August 23 92 DAP Dual Magnum 7.62EC @ 21 oz/A (PRE) Liberty 2.34SL @ 29 oz/A (28 DAP) Reflex 2SL @ 16 oz/A (28 DAP) Valor 51WG @ 3 oz/A (PRE) Liberty 2.34SL @ 29 oz/A (28 DAP) Dual Magnum 7.62EC @ 16 oz/A (28 DAP)
Bolt™ Soybeans Pioneer 4909BR and Pioneer 50T15BR Enhanced tolerance to sulfonylurea herbicides such as Leadoff and Basis Blend Leadoff = rimsulfuron (16.7%) + thifensulfuron (16.7%) Basis Blend = rimsulfuron (20%) + thifensulfuron (10%) Better tolerance than STS® beans Fit in Georgia? ALS-resistant Palmer amaranth is a problem already Protection from strong PRE’s that contain chlorimuron (i.e. Canopy, Envive, Trivence, Rowel FX)
Bolt™ Soybeans - 2016 SB-02-16 August 23 102 DAP Diligent (PRE) (Valor + Classic + Rimsulfuron) Roundup PowerMax 5.5SL @ 22 oz/A (28 DAP) Synchrony XP 28.4DG @ 1.1 oz/A (28 DAP)
Canopy or Canopy Blend?? Canopy 75DG metribuzin (64.3%) + chlorimuron (10.7%) 6-10 oz/A based upon soil type and OM Canopy Blend 58.3DG metribuzin (50%) + chlorimuron (8.3%) 7.75 – 12.4 oz/A based upon soil type and OM Use an SR/STS® or Bolt™ variety if you can
Surveil 48WDG Dow AgroSciences Valor (36%) + FirstRate (12%) 2.8 to 4.2 oz/A PRE within 3 days of planting Better residual control of annual mg than Valor alone? 2.8 oz/A 2 oz/A Valor 51WG 0.4 oz/A FirstRate 84WG NTC Surveil 48WG 2.8 oz/A (PRE) 75 DAT
2,4-D/Dicamba Technologies 2,4-D dicamba
Do we have to have this new technology? PPO’s still working? Reflex, Valor When will Liberty crash and burn? Dryland production Residual activation
Do we have to have the auxin technologies? SB-09-16 July 18 52 DAP NTC Gramoxone 2SL @ 48 oz/A (2 DBP) Tricor 75DG @ 5.3 oz/A (2 DBP) NIS @ 0.25% v/v (2 DBP) Roundup PowerMax 5.5SL @ 32 oz/A (25 DAP) Reflex 2SL @ 24 oz/A (25 DAP) Roundup PowerMax 5.5SL @ 32 oz/A (2 DBP) Clarity 4SL @ 16 oz/A (2 DBP) Valor 51WG @ 2.5 oz/A (2 DBP) Roundup PowerMax 5.5SL @ 32 oz/A (25 DAP) Clarity 4SL @ 16 oz/A (25 DAP) NIS @ 0.25% v/v (25 DAP) Roundup Ready Dicamba
Do we have to have the auxin technologies? SB-05-16 August 22 90 DAP NTC Rowel FX 40.3WG @ 3 oz/A (PRE) Roundup Xtendimax 3SL @ 64 oz/A (21 DAP) Dicamba RR Liberty Rowel FX 40.3WG @ 3 oz/A (PRE) Warrant 3SC @ 48 oz/A (PRE) Roundup PowerMax 5.5SL @ 32 oz/A (21 DAP) Warrant 3SC @ 48 oz/A (21 DAP) Prefix 5.29EC @ 32 oz/A)(PRE) Liberty 2.34SL @ 29 oz/A (21 DAP)
Enlist™ Soybeans (2016) SB-13-16 July 22 72 DAP NTC Surveil 48WG @ 2.83 oz/A (PRE) Enlist Duo 3.33SL @ 75 oz/A (34 DAP) Dual II Magnum 7.64EC @ 16 oz/A (34 DAP) AMS @ 2.5% v/v (34 DAP)
DT-Soybeans (2016) SB-05-16 July 27 64 DAP NTC Rowel FX 40.3WG @ 3 oz/A (PRE) Roundup Xtendimax 3SL @ 64 oz/A (21 DAP)
Variety Performance?????
2016 University Xtend Soybean Variety Performance Georgia ?? South Carolina ?? Arkansas Early Planted: 17/25 Xtend varieties yielded above all-location test average Full Season: 27/57 Xtend varieties yielded above all-location test average Mississippi 4/37 Xtend varieties yielded above all-location test average Wisconsin 200 RR2Y vs 47 RR2X varieties RR2Y +1.8 Bu/A advantage over RR2X
Enlist™ Duo vs. Xtendimax™ **NOT YET LABELED IN GEORGIA!
Table 1. Spray Droplet Size Classification1. 1Estimated from sample reference graph in ASBAE/ANSI/ASAE Standard S572.1 2VMD = Volume median diameter
Medium vs. Ultra Coarse Droplets Source: University of Nebraska – PAT Lab
11002DG VMD50 = 322 (C) AIXR 11002 VMD50 = 402 (VC) TTI 02 VMD50 = 524 (XC)
Enlist™ Duo Rec’s – 2017 (when labeled) Start clean! Tillage, herbicides, cover crops Plant in narrow rows. USE A PRE Valor, Fierce, Boundary, many others Enlist™ Duo 3.3SL @ 56-76 oz/A VE to/thru R2 (full-flowering) Palmer < 4” tall 2nd application of Enlist Duo? 12 days apart hand-weed escapes
Current (15) Arkansas Illinois Indiana Iowa Kansas Louisiana Minnesota Mississippi Missouri Nebraska North Dakota Oklahoma Ohio South Dakota Wisconsin Proposed Additions (19) Alabama Arizona Colorado Delaware Florida Georgia Kentucky Maryland Michigan North Carolina New Jersey New Mexico New York Pennsylvania South Carolina Tennessee Texas Virginia West Virginia. States
Approved Enlist™ Tank-Mix Partners (11/30/2016) www.enlist.com/en/tank-mix AMS 4XL, Array, Bronc, Buckhorn Total, Choice Weather Master, Class Act NG, Class Act Ridion, Coact-D, Coact-D Plus, Deliver DX2, Deriva, Deuce, Direct DRT, Downdraft, Eminence, Event, Fixate, Foam Breaker, Foam Fighter, FS Attero, FS Certin, FS Tenax, Gundown Max, Hypertonic, InterLock, Kontact, LI 700, Liberate, Max-In Zinc, M-Power, MSO Concentrate with Lecitech, NDemand Nitrozin, Nutrisync D, PinPoint Plus, PowerShot!, Prefer 90, R-11, Remain, Request, Savvy, Sedate Max, Smart Trio, Smoke, Syntact, Torus, Traverse D, Turbo, Woodside, Zenith
Xtend Soybean Rec’s - 2017 ONLY use Xtendimax!!! Start clean! Tillage, herbicides, cover crops Plant in narrow rows. USE A PRE Valor, Fierce, Boundary, many others Xtendimax 2.9SL @ 22 oz/A VE to/thru R1 (beginning bloom) Palmer < 4” tall Clean up grasses with glyphosate 2nd application of Xtendimax? 7 days apart hand-weed escapes
Approved Xtendimax™ Tank-Mix Partners www.xtendimaxapplicationrequirements.com ?????????
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.
Off-Label Dicamba Use in 2016 Missouri > 100 complaints Arkansas 24 complaints EPA Compliance Advisory August 2016 It’s on the EPA’s radar!
Is it worth this?
2,4-D and Dicamba Soybeans Final Thoughts NOT a miracle cure for all weed problems! Improvements in formulations and nozzles reduce volatility/drift potential but do NOT eliminate it! Still have to be a smart applicator! Using Pesticides Wisely Lessons learned since introduction of glyphosate resistant crops? Weed Science is not just herbicides!
2015-2016 Auxin Trainings “Using Pesticides Wisely”
Auxin Resistance Already Out There! Older chemistries 2,4-D (1945) dicamba (1967) 32 species worldwide 8 species in US tall waterhemp (NE, IL) yellow starthistle (WA) speading dayflower (HI) wild carrot (MI, OH) smooth crabgrass (CA) barnyardgrass (AR, LA) kochia (MT, ND, ID, CO, NE, KS) prickly lettuce (WA)
QUESTIONS? www.gaweed.com