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- 2018 Soybean Weed Control Update Eric P. Prostko Professor and Extension Weed Specialist Dept. Crop & Soil Sciences
- Soybeans in Georgia Planted Acres (X 1000) 1980-2017 Source: NASS
- 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)
- Started Clean + Activated Residual + Timely POST = HOMERUN! SB-01-17 June 16 38 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.
- 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 Whitaker, 2015 (Midville, GA) 22” TO 15” = 19% yield increase 22” TO 7.5” = 30% yield increase
- Marestail in Soybean (i.e. Horseweed) Tillage Burndown Liberty (glufosinate) + metribuzin? Glyphosate + Dicamba or 2,4-D? Sharpen + MSO 0-30 DBP Paraquat + metribuzin Residual Valor, metribuzin In-Crop Liberty (LL) Dicamba (Xtend) 2,4-D choline (Enlist) FirstRate or Classic (Any)
- Just thinking??? Fierce or Valor or Envive or Valor XLT or Trivence or Surveil (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
- Powerful Soybean PRE’S (but PPO’s) Flumioxazin products Valor, Rowel, Panther, Outflank, Valor XLT (Valor + Classic), Surveil (Valor + FirstRate), Envive (Valor + Classic + Harmony), Trivence (Valor + Classic + Metribuzin), Fierce (Valor + Zidua), Rowel FX (Rowel + Classic) Sulfentrazone (S) products Sonic (S + FirstRate), Authority MTZ (S + Metribuzin), Authority Assist (S + Pursuit), Authority Elite (S + Dual Magnum), Authority First (S + FirstRate), Authority Maxx or Authority XL (S + Classic), Spartan Charge (S + Aim) Fomesafen products Reflex, Prefix (Reflex + Dual Magnum), Warrant Ultra (Reflex + Warrant)
- Don’t Forget These!
- 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
- Soybean Weed Control - 2017 NTC Tricor 4L @ 8 oz/A (PRE) Roundup P-Max 5.5SL @ 32 oz/A (26 DAP) Reflex 2SL @ 20 oz/A (26 DAP) SB-06-17 June 16 38 DAP
- Soybean Weed Control - 2017 NTC Tricor 4L @ 8 oz/A (PRE) Roundup P-Max 5.5SL @ 32 oz/A (26 DAP) Reflex 2SL @ 20 oz/A (26 DAP) SB-06-17 July 17 69 DAP
- Liberty-Link® Soybeans Liberty 2.34SL @ 22-36 oz/A or generics 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 **Best Results 15 GPA, medium droplet size, small weeds, 9 am - 6 pm
- Soybean Weed Control – 2017 Xtend vs. Liberty Systems SB-08-17 August 16 77 DAP NTC Rowel FX @ 3 oz/A (PRE) Roundup P-Max @ 32 oz/A (23 DAP) Xtendimax @ 22 oz/A (23 DAP) Intact @ 0.5% v/v (23 DAP) Dual Magnum @ 16 oz/A (PRE) Liberty @ 29 oz/A (23 DAP) Reflex @ 20 oz/A (23 DAP)
- Liberty-Link Varieties Getting better and better 2017 UGA OVT’s G13LL-7 and G13LL-44 bred by UGA Team Group VII’s Licensed to AgSouth/Meherrin
- 2,4-D/Dicamba Technologies 2,4-D dicamba
- Enlist Soybeans (2,4-D tolerant) No China approval yet 2018 Dow/ADM Locations Mankato, Minnesota Frankfort, Indiana Mexico, Missouri Deerfield, Missouri Glyphosate + 2,4-D choline 2,4-D choline
- 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)
- Engenia Program - 2017 SB-01-17 July 17 69 DAP NTC Valor SX 51WG @ 3 oz/A (PRE) Roundup P-Max 5.5 SL @ 32 oz/A (27 DAP) Engenia 5SL @ 12.8 oz/A (27 DAP) Cinch 7.4EC @ 16 oz/A (27 DAP)
- XtendiMax Program - 2017 SB-07-17 July 17 69 DAP NTC Valor SX 51WG @ 3 oz/A (PRE) Roundup P-Max 5.5 SL @ 28/A (27 DAP) Xtendimax + VG 2.9SL @ 22 oz/A (27 DAP)
- XtendiMax Program - 2017 SB-07-17 July 17 69 DAP NTC Tricor 4L @ 8 oz/A (PRE) Roundup P-Max 5.5 SL @ 28/A (27 DAP) Xtendimax + VG 2.9SL @ 22 oz/A (27 DAP)
- XtendiMax Program – 2017 (NO RESIDUALS) SB-07-17 July 17 69 DAP NTC Roundup P-Max 5.5 SL @ 28/A (27 DAP) Xtendimax + VG 2.9SL @ 22 oz/A (27 DAP)
- 2,4-D and Dicamba Crops (Don’t Get Messed Up!)
- Off-Target Dicamba Problems
- 986 40 114 4 250 0 128 28 0 15 7 0 3 2 310 93 107 125 19 245 2 132 78 ©Dr. Kevin Bradley, University of Missouri Official Dicamba-related Injury Investigations as Reported by State Departments of Agriculture (*as of October 15, 2017) *Total: 2,708 18 2
- 900k 250k 250k <1k 265k 55k 15k 1k 3k <1k 325k 50k 150k 100k 2.5k 400k ©Dr. Kevin Bradley, University of Missouri Estimates of Dicamba-injured Soybean Acreage in the U.S. as Reported by State Extension Weed Scientists (*as of October 15, 2017) 250 k 600k 33k 10k *Total: ~3.6 million <1k <1k <1k <1k <1k
- Dicamba Label Changes for 2018 - General Engenia®, Fexapan™, and Xtendimax® will now be considered Restricted Use Pesticides. Fexapan™ and Xtendimax® minimum GPA changed to 15 gallons. Can only be applied from sunrise until sunset and wind speeds from 3 to 10 MPH. Growers who use Engenia®, Fexapan™, and Xtendimax® will be required to keep the following records for a period of 2 years, records must be generated within 14 days of application, and a record must be kept for every application: UGA-Form????
- Dicamba Label Changes for 2018 – Required Records Certified Applicator Name Applicator Certification Number Product Name EPA registration Number Total Amount Applied Application Date Location of application Crop or site of application Size of area treated Training Requirement: Proof of auxin training Application timing: PRE or number of days after planting Receipts of Product Purchase Products Labels Buffer Requirements: record buffer distance calculations Sensitive Crop Awareness: Applicator must survey and document neighboring fields for sensitive areas or crops Spray Systems Cleanout: Must be documented that applicator complied with label. Tank-Mix-Products: complete list of all approved products that were tank-mixed Application Start and Finish Times Nozzle Selection Air Temperature: At boom height for start and finish Wind Speed/Direction: At boom height for start and finish
- Variety Performance?????
- Auxin Resistance Already Out There! Older chemistries 2,4-D (1945) dicamba (1967) 36 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, WA) prickly lettuce (WA)
- Important Auxin Web-Sites Enlist http://www.enlist.com/en/herbicides Xtendimax http://www.xtendimaxapplicationrequirements.com/Pages/default.aspx Fexapan http://www.dupont.com/products-and-services/crop-protection/soybean-protection/articles/fexapan-application.html Engenia http://agproducts.basf.us/campaigns/engenia/tankmixselector/
- Dicamba Applications Summary - I
- Dicamba Applications Summary - II
- Harvest Aids Soybeans *Glyphosate and Aim are also labeled (more for weed control than crop dessiccation).
- Important Soybean Stages for Harvest Aids R5 R6 or later R5-R6 = 11- 20 days (15 avg.) R6-R7 = 9- 30 days (18 avg.)
- If you want to create more resistance, STOP…. using tillage using residuals using multiple modes of action using labeled rates being timely rotating crops hand-weeding remembering what happened to glyphosate