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2016 Soybean Weed Control Update
AUTHOR
Eric P. Prostko
Professor and Extension Weed Specialist
University of Georgia
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TABLE OF CONTENTS
2016 Soybean Weed Control Update
Narrow Rows and Weed Control - Soybeans
U.S Soybean Row Spacing - 2015
Row Spacing Effects on Soybean Yield In Georgia
Just thinking???
This Should Scare You!!!!!!
STS/SR Soybeans (sulfonylurea tolerant, sulfonylurea ready)
Don’t forget about metribuzin on soybean?
Metribuzin Based Soybean Weed Control Program - 2014
For Growers in Peanut/Cotton Rotations Who Want to Protect Valor and Reflex
When/Where?
Soybean Weed Control August 13, 2015 (99 DAP)
No PPO Pre Weed Control in Soybean
Fomesafen Formulations for Soybeans
Warrant Injury on Soybean??
Liberty-Link® Soybeans
Glufosinate Formulations
Weed Control in LL Soybeans
This Must Be Stopped!!! Liberty on Large Pigweed!!!!!
On the Next Horizon
HPPD Soybeans - 2015
Warrant Ultra 3.45CS
Surveil 48WDG
Do early applications of Cobra improve soybean yield?
Roundup WM @ 32 oz/A + Reflex @ 24 oz/A + Pursuit @ 4 oz/A
2,4-D/Dicamba Technologies
Enlist Duo Recent Problems
What happened in 2015 and what will happen in 2016?
Less drift potential and less volatility does not mean 0 drift or volatility!!!
How good is dicamba on Palmer?
Dicamba/2,4-D Symptomology
Enlist™ Herbicide Tolerant Soybean
Enlist Soybeans - 2012
Dicamba-Tolerant (DT) Soybeans
Roundup Xtend - 2014
Engenia Program - DT Soybeans 2014
2,4-D and Dicamba Tolerant Soybeans
2,4-D and Dicamba Soybeans Stewardship
Nozzles
Enlist Duo Nozzle Tips/Pressure
XtendiMax, RoundupXtend, Engenia Nozzles
11002DG, AIXR 11002, TTI 02
Boom Height
Buffers
Sprayer Cleanout- Is it possible in this rig?
Enlist Duo Sprayer Cleanout
XtendiMax, RoundupXtend, Engenia Sprayer Cleanout
2,4-D and Dicamba Crops (Don’t Get Messed Up!)
QUESTIONS?
SLIDE CONTENTS
2016 Soybean Weed Control Update Eric P. Prostko Professor and Extension Weed Specialist Dept. Crop & Soil Sciences
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- 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.
U.S Soybean Row Spacing - 2015 Source: NASS – Crop Production (November 2015)
Row Spacing Effects on Soybean Yield In Georgia Carter and Boerma, 1979 (Athens, GA) 38” to 19” = 11% yield increase Parker et al., 1981 (Tifton, GA) 36” to 18” = 4% increase Boerma and Ashley, 1982 (Plains, GA) 36” to 20” = 17% yield increase Ethredge et al., 1989 (Plains, GA) 30” to 20” = 8% yield increase 30” to 10” = 11% yield increase 20” to 10” = 3% yield increase Woodruff, 2007-2008 (Camilla, GA) 36” to 24” = 8% yield increase Washington County, GA (2008)
Just thinking??? Fierce or Valor or Envive or Valor XLT (PRE) followed by Reflex (POST) = great pigweed control but not great ……. Resistance Management PPO followed by PPO Not great in cotton and peanut rotations relying on Valor and Reflex Might be OK in corn/soybean rotation when no PPO is used in corn
This Should Scare You!!!!!!
STS/SR Soybeans (sulfonylurea tolerant, sulfonylurea ready) May want to consider these if using Envive or Canopy Help minimize PRE injury from Classic in adverse conditions (i.e. cool, wet) Bolt Technology™ DuPont
Don’t forget about metribuzin on soybean? Not a PPO (Valor or Reflex) Good on pigweed and sicklepod Can be applied PPI Dryland fields? Issues (Be careful!!) soil texture, OM, pH Varieties Rotations Company support Lack of incentive at dealer level TriCor 75DF Metribuzin 75DF
Metribuzin Based Soybean Weed Control Program - 2014 NTC Boundary – PRE Flexstar GT - POST SB-14-14 July 24 66 DAP
For Growers in Peanut/Cotton Rotations Who Want to Protect Valor and Reflex RR Soybeans Warrant or Dual Magnum or Zidua or Anthem fb Glyphosate + Reflex (Flexstar GT) or Glyphosate + Prefix/Statement or Warrant Ultra Tricor or Boundary or Canopy or Authority MTZ (metribuzin herbicides) fb Glyphosate + Reflex (Flexstar GT) or Glyphosate + Prefix/Statement or Warrant Ultra LL Soybeans Warrant or Dual Magnum or Zidua or Anthem fb Liberty + Reflex or Prefix/Statement or Warrant Ultra Reflex or Valor or Prefix fb Liberty + Warrant or Dual Magnum or Zidua or Anthem No metribuzin on LL varieties Herbicide Resistance?
When/Where?
Soybean Weed Control August 13, 2015 (99 DAP) NTC NTC NTC SB-01-15 Started clean Dual Magnum (PRE) 0.5” irrigation (1 DAT) Roundup WM + Reflex or Prefix + Classic or FirstRate (23 DAP)
No PPO Pre Weed Control in Soybean SB-13-15 August 25 111 DAP NTC Dual Magnum 7.62EC @ 16 oz/A – PRE Roundup WM 5.5SL @ 32 oz/A – 24 DAP Reflex 2SL @ 24 oz/A – 24 DAP
Fomesafen Formulations for Soybeans (2.87 lb ai/gal)
Warrant Injury on Soybean??
Liberty-Link® Soybeans Liberty 2.34SL @ 22-36 oz/A VE-R1 2 applications (65 oz/A/year total) Tank-mixes with POST grass herbicides may reduce grass control Assure (10-21%); Fusilade (8-12%); Poast (25-41%); Select (4-22%) Residuals still needed Variety performance? Getting better **Best Results 15 GPA, medium droplet size, small weeds, 9 am - 6 pm
Glufosinate Formulations
Weed Control in LL Soybeans SB-23-13 July 17 64 DAP NTC Dual Magnum @ 16 oz/A (PRE) Liberty @ 29 oz/A (MPOST) Reflex @ 16 oz/A (MPOST)
This Must Be Stopped!!! Liberty on Large Pigweed!!!!!
On the Next Horizon HPPD resistant soybeans Bayer/MS Technologies “Balance” beans Glyphosate + isoxaflutole 2015????? Syngenta + Bayer “MGI” beans Mesotrione (Callisto) Glufosinate (Liberty) Isoxaflutole (Balance) 2015-2020????
HPPD Soybeans - 2015 SB-09-15 July 21
Warrant Ultra 3.45CS Monsanto Premix of Warrant (2.82 lb ai/A) + Reflex (0.63 lb ai/A) MOA = 15 + 14 Compete with Prefix PRE to R2 48-50 oz/A Warrant @ 45-47 oz/A Reflex @ 15-16 oz/A NTC Warrant @ 48 oz/A (PRE) + Roundup P-Max @ 32 oz/A Warrant Ultra @ 50 oz/A (15 DAP) Photo – 111 DAP (SB-12-15)
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 Left = Untreated Right = Surveil 48WG @ 2.8 oz/A July 21, 2015 75 DAT SB-04-15
Do early applications of Cobra improve soybean yield?
Roundup WM @ 32 oz/A + Reflex @ 24 oz/A + Pursuit @ 4 oz/A 5 DAT 10 DAT
2,4-D/Dicamba Technologies 2,4-D dicamba
Enlist Duo Recent Problems
What happened in 2015 and what will happen in 2016?
Less drift potential and less volatility does not mean 0 drift or volatility!!!
How good is dicamba on Palmer? SB-10-15 July 7 35 DAT AMAPA – 1-8” tall NTC Roundup PM @ 22 oz/A Clarity @ 16 oz/A Roundup PM @ 22 oz/A Cobra @ 16 oz/A COC @ 1% v/v 15 GPA TTI02 tips
Dicamba/2,4-D Symptomology
Enlist™ Herbicide Tolerant Soybean tolerance to 2,4-D + glyphosate + glufosinate (Liberty) 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 Burndown/PRE application + 2 POST applications (R2 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) 2,4-D choline
Enlist Soybeans - 2012 NTC Valor SX 51WG - PRE (May 4) Enlist Duo - MPOST (June 1) N-PAK AMS - MPOST (June 1) SB-09-12 Planted May 3 Photo: June 29
Dicamba-Tolerant (DT) Soybeans Monsanto/BASF Roundup Ready 2 Xtend (Monsanto) XtendiMax Reduced volatility dicamba Roundup Xtend Reduced volatility dicamba + glyphosate Engenia™ (BASF) Reduced volatility formulation of dicamba Banvel = dicamba-DMA Clarity = dicamba-DGA Engenia = dicamba–BAPMA PRE or POST RESIDUAL STILL NEEDED!!!!!!!!!!!!!!!!!!!!!!! 2016?
Roundup Xtend - 2014 SB-10-14 July 21 D after POST NTC Valor – PRE Roundup Xtend - POST
Engenia Program – DT Soybeans 2014 (EPOST Applied 13 DAP) NTC Roundup P-Max + Induce EPOST Prowl H20 – PRE Zidua + Roundup P-Max + ENGENIA + Induce EPOST New-2014, July 14 27 d after EPOST
2,4-D and Dicamba Tolerant Soybeans Still need a residual! Still need to be timely (3-4” tall weeds)! Will also need Liberty! Not on Xtend beans though! Must significantly improve in the areas of drift and sprayer contamination management
2,4-D and Dicamba Soybeans Stewardship Droplet size (VMD) Nozzle selection Pressure GPA Tractor speed Boom Height Wind Speed/Direction Buffers Sprayer cleanout
Nozzles TTI AIXR TDXL (Greenleaf) TeeJet
Enlist™ Duo Nozzle Tips/Pressure
XtendiMax, RoundupXtend, Engenia Nozzles Engenia (EC to UC droplet size) Roundup Xtend (VC to UC)
11002DG VMD50 = 322 (C) AIXR 11002 VMD50 = 402 (VC) TTI 02 VMD50 = 524 (EC)
Boom Height
Buffers At the time of application, the wind cannot be blowing toward adjacent commercially grown tomatoes and other fruiting vegetables (EPA crop group 8), cucurbits (EPA crop group 9), grapes and cotton.
Sprayer Cleanout Is it possible in this rig?
Enlist™ Duo Sprayer Cleanout
XtendiMax, RoundupXtend, Engenia Sprayer Cleanout
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.
QUESTIONS? www.gaweed.com