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2019 Soybean Weed Control Update
AUTHOR
Eric P. Prostko
Professor and Extension Weed Specialist
University of Georgia
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TABLE OF CONTENTS
2019 Soybean Weed Control Update
Soybean/Cotton in Georgia Planted Acres (X 1000) 1980-2018
Soybean Weed Control
2018 Georgia Soybean Varieties
Started Clean + Activated Residual + Timely POST = HOMERUN!
Old + Cheap + Still Good (i.e. metribuzin)
Metribuzin Injury
Soybean Weed Control - 2018 (Conventional System)
Soybean Weed Control - 2018 RR System
Liberty-Link® Soybeans
Spray Tip Classification by Droplet Size - Liberty
Liberty-Link Soybean Varieties
Statewide Average Yield of UGA Developed LL Soybeans*
Soybean Weed Control - 2018 Liberty System
2,4-D/Dicamba Technologies
Enlist Soybeans (2016)
Soybean Weed Control - 2018 Xtend System
XTEND (dicamba) System (PRE + POST) vs LIBERTY System (PRE + POST)
Off-Target Dicamba Problems
Dicamba Perspective - 2018
Important Dicamba Label Updates for 2019 - Soybean
Endangered Species Information
Water pH and major cation concentrations of South Georgia Wells from July 1, 2014 to May 2, 2017
QUESTIONS?
SLIDE CONTENTS
2019 Soybean Weed Control Update Eric P. Prostko Professor and Extension Weed Specialist Dept. Crop & Soil Sciences
Soybean/Cotton in Georgia Planted Acres (X 1000) 1980-2018 Source: NASS BWEP
Soybean Weed Control Start clean, use residuals, timely POST Narrow rows (<30”) Systems Conventional RR (glyphosate) LL (glufosinate) Xtend (dicamba) Enlist (2,4-D choline)
2018 Georgia Soybean Varieties
Started Clean + Activated Residual + Timely POST = HOMERUN! SB-01-17 June 16 38 DAP
Old + Cheap + Still Good (i.e. metribuzin) 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 Injury
Soybean Weed Control – 2018 (Conventional System) SB-07-18 July 26 73 DAP NTC
Soybean Weed Control – 2018 RR System SB-06-18 July 26 73 DAP NTC Metribuzin 75DG @ 5.3 oz/A (PRE) Roundup Powermax 5.5SL @ 32 oz/A (31 DAP) Reflex 2SL @ 24 oz/A (31 DAP)
Liberty-Link® Soybeans Liberty 2.34SL @ 32-43 oz/A or generics VE-R1 2 applications (5 days apart) (87 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 15 GPA, medium-coarse droplet size, small weeds, 9 am - 6 pm
Spray Tip Classification by Droplet Size - Liberty 1Estimated from sample reference graph in ASBAE/ANSI/ASAE Standard S572.1 2VMD = Volume median diameter
Liberty-Link Soybean Varieties Getting better and better! G13LL-7 and G13LL-44 developed by UGA Soybean Breeding Team Group VII’s AGS 747LL (G13LL-7) AGSouth Southern Harvest 7418LL (G13LL-44) Meherrin Others
Statewide Average Yield of UGA Developed LL Soybeans* *Source: UGA OVT (6 locations/year, irrigated)
Soybean Weed Control – 2018 Liberty System SB-05-18 July 30 54 DAP NTC Surveil 48WG @ 2.8 oz/A (PRE) Liberty 2.34SL @ 29 oz/A (23DAP) Everprex 7.62EC @ 16 oz/A (23 DAP)
2,4-D/Dicamba Technologies 2,4-D choline dicamba
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)
Soybean Weed Control – 2018 Xtend System SB-07-18 July 26 73 DAP NTC Tricor 4L @ 8 oz/A - PRE Roundup PowerMax 5.5SL @ 32 oz/A – 30 DAP Xtendimax + VG 2.9SL @ 22 oz/A – 30 DAP Warrant 3ME @ 48 oz/A – 30 DAP Intact @ 0.5% v/v – 30 DAP
Soybean Weed Control - 2018 SB-01-18 July 20 SB-01-18 August 3
Off-Target Dicamba Problems
Dicamba Perspective – 2018 Only 4 “official” complaints to GA Dept. of Ag and no dicamba residues were detected (1-blueberry, 1-soybean, 2-non-DT cotton). I am personally aware of 24 “incidents” that were handled between 2 parties involved (1-tobacco, 8-soybean, 9-peanut, 4-cotton, 1-crepe myrtle, 1-apple). More than last year for me. Got to keep working on this!
Important Dicamba Label Updates for 2019 - Soybean Xtendimax, Fexapan, Engenia formulations Only certified applicators can purchase and apply Records generated within 72 hours of application and kept for 2 years Minimum of 15 GPA POST applications no later than R1 or 45 DAP Only 2 POST applications can be made (7 days apart) Sensitive crops must be surveyed and documented Sensitive crop/residential areas downwind – DO NOT APPLY Applications between 1 hour after sunrise to 2 hours before sunset 110’ downwind buffer + 57’ omni-direction buffer around other sides of field in counties where endangered dicot species exist Additional clean-out instructions/warnings Spray mixture pH > 5.0
Endangered Species Information Protecting Endangered Species from Pesticides https://www.epa.gov/endangered-species Bulletins Live! Two https://www.epa.gov/endangered-species/bulletins-live-two-view-bulletins U.S. Fish & Wildlife Service https://www.fws.gov/endangered/
QUESTIONS?