Weed Management Strategies for Wayne Keeling Weed Science and Cropping Systems Lubbock, Texas
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1 Weed Management Strategies for 2015 Wayne Keeling Weed Science and Cropping Systems Lubbock, Texas
2 Overview Weed resistance more than Palmer amaranth/glyphosate Palmer amaranth past and present Strategies for managing resistant Palmer amaranth Residual herbicides PPI, PRE and POST options POST options Liberty, Staple New technology Roundup Ready Xtend Crop System Enlist Weed Control System
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4 Herbicide Resistance in the U.S. 76 species with resistant biotypes 23 modes of action (MOA) with confirmed resistance WSSA recognizes 25 MOAs 145 resistant species-moa combinations Source: International Survey Herbicide Resistant Weeds
5 Source: International Survey Herbicide Resistant Weeds Source: International Survey Herbicide Resistant Weeds
6 Source: International Survey Herbicide Resistant Weeds
7 Herbicide Resistant Weeds Texas # Year Species Site of Action Activities Lolium perenne Perennial Ryegrass Echinochloa crus-galli var. crus-galli Barnyardgrass Amaranthus palmeri Palmer amaranth Kochia scoparia Kochia Sorghum halepense Johnsongrass Amaranthus tuberculatus (=A. rudis) Tall Waterhemp ALS inhibitors (B/2) PSII inhibitor (Ureas and amides) (C2/7) PSII inhibitor ALS inhibitors (B/2) ALS inhibitor EPSP synthase inhibitors (G/9) sulfometuron-methyl propanil atrazine metsulfuron-methyl imazethapyr, nicosulfuron glyphosate Amaranthus palmeri Palmer amaranth EPSP synthase inhibitors (G/9) glyphosate
8 Palmer amaranth Infests all cultivated cropland Emerges from May September Prolific seed producer Can be controlled by wide range of PRE and POST herbicides in addition to glyphosate
9 Herbicide Application Application Method Acres Treated (%) PPI 91 PRE 20 POST 1 Spot Treatment 40 Layby 1 Cultivation (3.1x) 98 Source: Smith, et al., 1996
10 Pre-Emergence Weed Control Lubbock, Texas Source:
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12 Roundup Ready Flex or GlyTol Cotton Weed Challenges Russian thistle Morningglory Horseweed
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15 Greenhouse Results Glyphosate- Resistant Palmer amaranth Sample 1 Sample 3 Samples 3 Samples Greenhouse study Samples collected from field brought to greenhouse Varying rates of glyphosate were applied 8:12 samples exhibited some level of glyphosate resistance 6 Samples
16 Southwest Lubbock County
17 Lubbock County October 2014
18 Residual Herbicides Pre-plant Incorporated (PPI) Dinitroanilines (DNA): Trifluralin (generics), Prowl Incorporation: tillage, irrigation Control small-seeded broadleaf weeds, annual grasses Rate related to soil type
19 Dinitroanilines Yellows Low water solubility no leaching Volatility: Trifluralin most volatile; Prowl less volatile Photodecomposition 2-pass mechanical incorporation disk, spring-tooth harrow, field cultivator, rolling cultivator Incorporation by irrigation or rainfall Prowl Trifluralin/Prowl combinations
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22 Valor Cotton EPP oz/a 21d interval prior to planting 1 irrigation Tank-mix with 2,4-D or glyphosate Residual Control Kochia, Russian-thistle, Palmer amaranth
23 Residual Herbicides PreEmergence (PRE) Caparol, Direx, Cotoran, Dual Magnum, Staple LX Palmer amaranth/broadleaf annuals broader spectrum than DNAs Dual Magnum grasses, yellow nutsedge Staple LX potential residue/rotation problems to sorghum or corn
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25 Residual Herbicides PostEmergence Topical (POST) Dual Magnum, Staple LX, Warrant, Prowl H20, Envoke Tank mix with Roundup Residual Palmer amaranth control Staple LX, Envoke improved POST and residual morningglory control
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27 Residual Herbicides PostEmergence Direct/Layby Caparol, Direx, Cotoran, Layby Pro Alone or with glyphosate Residual Palmer amaranth and morningglory control POST morningglory control Zidua, Anthem Flex (notlabeled on sandy soils)
28 Untreated Trifluralin PPI + Caparol PRE fb Dual POST
29 Liberty - POST Excellent activity on morningglory Effective burndown of perennials under active growing conditions Palmer amaranth control dependent on: Weed size Soil moisture Weather Growing conditions Glyphosate + Liberty tank mix Antagonism can occur
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32 Bollgard II XtendFlex Cotton 1 st three-way herbicide tolerance stack in cotton with tolerances to dicamba, glyphosate, and glufosinate. Built on proven success of Genuity Bollgard II with Roundup Ready Flex technology In 2013, 10 out of the top 10 Cotton varieties planted in the US feature Genuity Roundup Ready Flex technology (USDA, 2013) Added choice in weed control options with triple mode-ofaction herbicide tolerance available for pre-, at-, and postplanting Anticipated Introduction in Deltapine Brand and select licensees This information is for educational purposes only and is not an offer to sell Roundup Xtend or Xtendimax herbicides. Roundup Xtend and Xtendimax are not yet registered or approved for sale or use anywhere in the United States.
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34 Enhanced Chemistry Candidate Options for Roundup Ready Xtend Crop System Upon registration, Monsanto s dicamba formulations will be labeled for use, before, at, and after planting with Roundup Ready Xtend Crops Built with VaporGrip Technology By utilizing low volatility formulations, in combination with application requirements, growers can significantly reduce the potential for offtarget movement Enhanced dicamba and glyphosate herbicide premix Enhanced dicamba herbicide that farmers can use as tank mix partner Upon Registration This information is for educational purposes only and is not an offer to sell Roundup 2 Xtend, Bollgard II XtendFLEX, Roundup Xtend or Xtendimax herbicides. These products are not yet registered or approved for sale or use anywhere in the United States.
35 Potential Routes of Off-Site Movement Spray Drift Volatility Physical Particle Movement Vapor Movement Spray Tank Clean-out Direct application of herbicide to sensitive crops
36 Announcing VaporGrip Technology New VaporGrip Technology Coupled with application requirements will provide customers confidence in on-target application of dicamba. Banvel Clarity XtendiMax with VaporGrip Technology Candidate Significant Reduction in Volatility Potential When Using Low Volatility Formulations and New VaporGrip Technology This information is for educational purposes only and is not an offer to sell Roundup Xtend, XtendiMax, Bollgard II XtendFlex or Roundup Ready 2 Xtend. These products are not yet registered or approved for sale or use anywhere in the United States.
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38 Engenia Bollgard II XtendFlex Cotton To evaluate Engenia herbicide as part of an overall weed management system in cotton for the Texas High Plains.
39 Advancement in Dicamba Formulation Technology Experimental Results Not Registered or Available for Sale Engenia herbicide Chemistry: Dicamba BAPMA BAPMA: N,N-Bis- [aminopropyl]methylamine Tridentate amine provides strong performance Mechanism of Action: Auxin Agonist (mimic) Generally low potential for resistance >50 years of use Resistance documented in North America: Kochia Sinapis (wild mustard) Galeopsis (common hempnettle) BAPMA
40 Field Trials Trials conducted in 2013 and 2014: Seagraves Lubbock Halfway
41 Treatments Herbicide Rate (fl oz/a) Application Timing Prowl H2O 32 PRE Engenia 12.8 PRE, EPOST, MPOST Roundup PM 28 EPOST, MPOST Outlook 12 EPOST, MPOST All treatments applied at 20 GPA using TTI at 50psi
42 % Russian-thistle Control - Seagraves 100 LSD = Prowl PRE fb Roundup POST Prowl PRE fb Roundup + Engenia POST Prowl + Engenia PRE fb Roundup POST Prowl + Engenia PRE fb Roundup + Engenia POST Roundup POST Roundup + Engenia POST Prowl
43 Untreated Treated
44 % Palmer amaranth Control - Halfway 100 LSD = Prowl PRE Prowl PRE fb Roundup POST Prowl PRE fb Roundup + Engenia POST Prowl PRE fb Roundup + Engenia + Outlook POST Prowl + Engenia PRE Prowl + Engenia PRE fb Roundup POST Prowl + Engenia PRE fb Roundup + Engenia POST Prowl + Engenia PRE fb Roundup + Engenia + Outlook POST Roundup POST Roundup + Engenia POST Roundup + Outlook + Engenia POST Prowl
45 Untreated Treated
46 % Field Bindweed Control - Halfway 100 LSD = Prowl PRE Prowl PRE fb Roundup POST Prowl PRE fb Roundup + Engenia POST Prowl PRE fb Roundup + Engenia + Outlook POST Prowl + Engenia PRE Prowl + Engenia PRE fb Roundup POST Prowl + Engenia PRE fb Roundup + Engenia POST Roundup POST Roundup + Engenia POST Roundup + Outlook + Engenia POST Prowl + Engenia PRE fb Roundup + Engenia + Outlook POST
47 Untreated Treated
48 Crop Response Engenia (12.8 fl oz/a) + Roundup (28 fl oz/a) Untreated
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51 New(er) Herbicides Evaluated in 2013/2014 Zidua Pyroxasolfone (BASF) Post-directed in cotton and PRE in corn and wheat Anthem Flex Pyroxasolfone + Aim (FMC) Post-directed in cotton Fierce Pyroxasolfone + Valor (Valent) Post-directed in cotton Targa Quizalofop-P-Ethyl 0.88 lb a.i./gal (Gowan) Grass and volunteer corn
52 Volunteer Corn Control 2013 Herbicide oz/a Plant Height Targa Targa Applied 30-May, 10-June and 18-June at 10 GPA with 1% COC
53 Volunteer Corn Control 2014 Herbicide oz/a Plant Height Targa Targa Targa Applied 19-May, 2-June and 10-June at 10 GPA with 1% COC
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2014 Weed Control Manual for Tennessee Field Crops Forage Crops Pastures Farm Ponds Harvest Aids
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