Herbicide Classification Repeated use of herbicides with the same site of action can result in the development of herbicide-resistant weed populations.

Mode of This chart groups herbicides by their modes of action to assist you This chart lists premix herbicides alphabetically by their trade by in selecting herbicides 1) to maintain greater diversity in herbicide by Premix names so you can identify the premix’s component herbicides Action use and 2) to rotate among effective herbicides with different sites and their respective site of action groups. Refer to the Site (effect on plant growth) of action to delay the development of herbicide resistance. of Action chart on the left for more information.

Site of Action Number of Component Component Group resistant weed species Site of Action Site of Action in U.S. Group Group Site of Chemical ACTIVE Product ACTIVE Trade ACTIVE Trade Action Family INGREDIENT Examples (Trade Name®) PREMIX INGREDIENT Name® PREMIX INGREDIENT Name®

Lipid Synthesis Inhibitors Affinity BroadSpec thifensulfuron Harmony 2 pyrasulfotole ----- 27 clodinafop Discover NG (Affinity Tankmix) tribenuron Express 2 Huskie Complete bromoxynil Buctril 6 cyhalofop Clincher dicamba Clarity 4 thiencarbazone ----- 2 Aryloxyphenoxypro- fenoxaprop Ricestar, Tecoma, others thifensulfuron Harmony 2 rimsulfuron Resolve, Matrix 2 pionate (fops) Agility SG Instigate fluazifop Fusilade DX tribenuron Express 2 mesotrione Callisto 27 1 ACCase Inhibitors 15 (acetyl CoA carboxylase) quizalofop Assure II, Targa metsulfuron Ally 2 Keystone acetochlor Surpass 15 clethodim Select Max, others thifensulfuron Harmony 2 (Keystone LA) atrazine AAtrex 5 Cyclohexanedione (dims) sethoxydim Poast, Poast Plus Ally Extra tribenuron Express 2 mesotrione Callisto 27 Phenylpyrazolin pinoxaden Axial XL metsulfuron Ally 2 Lexar EZ s-metolachlor Dual II Magnum 15 pyroxasulfone Zidua 15 atrazine AAtrex 5 Amino Acid Synthesis Inhibitors Anthem fluthiacet Cadet 14 mesotrione Callisto 27 imazamox Raptor, Beyond pyroxasulfone Zidua 15 Lumax EZ s-metolachlor Dual II Magnum 15 imazapic Plateau Imidazolinone Anthem ATZ fluthiacet Cadet 14 atrazine AAtrex 5 imazaquin Scepter atrazine AAtrex 5 dicamba Clarity 4 imazethapyr Pursuit, Newpath Marksman sulfentrazone Spartan 14 atrazine AAtrex 5 bispyribac Regiment Authority Assist Pyrimidinylthiobenzoic imazethapyr Pursuit 2 fluthiacet Cadet 14 acid pyrithiobac Staple Marvel sulfentrazone Spartan 14 fomesafen Flexstar 14 flucarbazone Everest, Pre-Pare Authority Elite Sulfonylaminocarbonyl- s-metolachlor Dual Magnum 15 primisulfuron Beacon 2 propoxycarbazone Olympus NorthStar triazolinones sulfentrazone Spartan 14 dicamba Clarity 4 thiencarbazone component of Capreno, others Authority First cloransulam FirstRate 2 clomazone Command 13 bensulfuron Londax Obey sulfentrazone Spartan 14 quinclorac Facet 4 chlorimuron Classic Authority MTZ metribuzin Sencor 5 saflufenacil Sharpen 14 chlorsulfuron Glean Optill Authority XL sulfentrazone Spartan 14 imazethapyr Pursuit 2 foramsulfuron Option (Authority Maxx) chlorimuron Classic 2 saflufenacil Sharpen 14 halosulfuron Permit iodosulfuron Autumn 2 OpTill PRO imazethapyr Pursuit 2 iodosulfuron Autumn Autumn Super thiencarbazone ––––– 2 dimethenamid-P Outlook 15 mesosulfuron Osprey ALS Inhibitors pinoxaden Axial XL 1 florasulam ––––– 2 45 metsulfuron Ally Axial Star Orion 2 (acetolactate synthase) fluroxypyr Starane 4 MCPA MCPA 4 nicosulfuron Accent Q rimsulfuron Resolve 2 thifensulfuron Harmony 2 Sulfonylurea orthosulfamuron Strada Basis Blend Permit Plus thifensulfuron Harmony 2 halosulfuron Permit 2 primisulfuron Beacon desmedipham Betenex 5 carfentrazone Aim 14 prosulfuron Peak Betamix Priority phenmedipham ––––– 5 halosulfuron Permit 2 rimsulfuron Resolve, Matrix Bicep II Magnum s-metolachlor Dual II Magnum 15 s-metolachlor Dual Magnum 15 sulfosulfuron Maverick Prefix (Bicep Lite II Magnum) atrazine AAtrex 5 fomesafen Reflex 14 thifensulfuron Harmony s-metolachlor Dual Magnum 15 rimsulfuron Resolve 2 triasulfuron Amber Boundary Prequel metribuzin Sencor 5 isoxaflutole Balance Flexx 27 tribenuron Express Breakfree ATZ acetochlor Breakfree 15 desmedipham Betenex 5 trifloxysulfuron Envoke (Breakfree ATZ Lite) atrazine AAtrex 5 Progress phenmedipham ––––– 5 triflusulfuron UpBeet s-metolachlor Dual Magnum 15 ethofumesate Nortron 16 cloransulam FirstRate BroadAxe sulfentrazone Spartan 14 dicamba Clarity 4 florasulam component of Orion Pulsar carfentrazone Aim 14 fluroxypyr Starane 4 Triazolopyrimidine flumetsulam Python Broadhead quinclorac Facet 4 imazethapyr Pursuit 2 penoxsulam Grasp Pursuit Plus bromoxynil Buctril 6 pendimethalin Prowl 3 pyroxsulam PowerFlex HL Bronate MCPA MCPA 4 triasulfuron Amber 2 Rave EPSP Synthase Inhibitor alachlor Micro-Tech 15 dicamba Clarity 4 Roundup, Touchdown, Bullet 9 (5-enolpyruvyl-shikimate- 14 None accepted glyphosate atrazine AAtrex 5 flucarbazone Everest 2 several Raze 3-phosphate) mesotrione Callisto 27 fluroxypyr Starane 4 Callisto Xtra atrazine AAtrex 5 rimsulfuron Resolve 2 Realm Q Growth Regulators chlorimuron Classic 2 mesotrione Callisto 27 Canopy metribuzin Sencor 5 cyhalofop Clincher 1 Benzoic acid dicamba Banvel, Clarity, others RebelEX clopyralid chlorimuron Classic 2 penoxsulam Grasp 2 Stinger Canopy EX fluroxypyr Starane tribenuron Express 2 rimsulfuron Resolve 2 T1R1 AUXIN RECEPTORS Carboxylic acid Require Q triclopyr Grandstand thiencarbazone ––––– 2 dicamba Clarity 4 4 (synthetic auxins) 10 Capreno quinclorac tembotrione Laudis 27 rimsulfuron Resolve 2 Facet, Paramount Resolve Q 2,4-D 2,4-D, others Cinch ATZ s-metolachlor Dual II Magnum 15 thifensulfuron Harmony 2 Phenoxy (Cinch ATZ Lite) MCPA atrazine AAtrex 5 bentazon Basagran 6 MCPA, others Rezult quinclorac Facet 4 sethoxydim Poast 1 Semicarbazone diflufenzopyr component of Status Clearpath 19 Auxin Transport Inhibitor 0 imazethapyr Newpath 2 propoxycarbazone Olympus 2 Rimfire Max thiencarbazone ––––– 2 mesosulfuron Osprey 2 Corvus Photosynthesis Inhibitors isoxaflutole Balance Flexx 27 s-metolachlor Dual Magnum 15 Sequence desmedipham Betenex clopyralid Stinger 4 glyphosate glyphosate 9 Phenylcarbamate Curtail phenmedipham 2,4-D 2,4-D 4 atrazine AAtrex 5 component of Betamix Shotgun atrazine clopyralid Stinger 4 2,4-D 2,4-D 4 AAtrex, others Curtail M Triazine prometryn Caparol MCPA MCPA 4 sulfentrazone Spartan 14 Photosystem II Inhibitors 26 Sonic 5 (different binding than 6 & 7) simazine acetochlor Degree 15 cloransulam FirstRate 2 Princep Degree Xtra hexazinone Velpar atrazine AAtrex 5 sulfentrazone Spartan 14 Triazinone Spartan Charge metribuzin Sencor, others chlorimuron Classic 2 carfentrazone Aim 14 Uracil terbacil Enlite thifensulfuron Harmony 2 prosulfuron Peak 2 Sinbar Spirit Benzothiadiazole bentazon Basagran flumioxazin Valor 14 primisulfuron Beacon 2 Photosystem II Inhibitors 1 6 (different binding than 5 & 7) Nitrile bromoxynil chlorimuron Classic 2 florasulam ––––– 2 Buctril, others Starane Flex Amide propanil SuperWham Envive thifensulfuron Harmony 2 fluroxypyr Starane 4 diuron Direx, Karmex flumioxazin Valor 14 fluroxypyr Starane 4 7 Photosystem II Inhibitors 8 Starane NXT (different binding than 5 & 6) Urea fluometuron Cotoran s-metolachlor Dual Magnum 15 bromoxynil Buctril 6 linuron Expert atrazine AAtrex 5 diflufenzopyr ––––– 19 Lorox, Linex Status glyphosate glyphosate 9 dicamba Clarity 4 Nitrogen Metabolism Inhibitor imazethapyr Pursuit 2 nicosulfuron Accent Q 2 Extreme Steadfast Q Glutamine Synthetase glyphosate glyphosate 9 rimsulfuron Resolve 2 Organophosphorus glufosinate Liberty 10 Inhibitor 1 acetochlor Harness 15 fluroxypyr Starane 4 Field Master atrazine AAtrex 5 Supremacy thifensulfuron Harmony 2 Pigment Inhibitors glyphosate glyphosate 9 tribenuron Express 2 DITERPENE BIOSYNTHESIS flumioxazin Valor 14 prometryn Caparol 5 Isoxazolidinone clomazone Command Fierce Suprend 13 INHIBITOR 1 pyroxasulfone Zidua 15 trifloxysulfuron Envoke 2 Isoxazole isoxaflutole flumioxazin Valor 14 bentazon Basagran 6 Balance Flexx Storm Pyrazole pyrasulfotole component of Huskie Fierce XLT* pyroxasulfone Zidua 15 acifluorfen Ultra Blazer 14 27 HPPD Inhibitors 2 Pyrazolone topramezone Armezon, Impact chlorimuron Classic 2 acetochlor Surpass 15 mesotrione Callisto chlorsulfuron Glean 2 SureStart clopyralid Stinger 4 Triketone Finesse tembotrione Laudis metsulfuron Ally 2 flumetsulam Python 2 Finesse Grass chlorsulfuron Glean 2 chlorimuron Classic 2 Synchrony Cell Membrane Disrupters and Broadleaf flucarbazone Everest 2 thifensulfuron Harmony 2 sulfentrazone fomesafen Flexstar 14 acetochlor Harness 15 Spartan Flexstar GT Aryl triazinone carfentrazone Aim glyphosate glyphosate 9 TripleFLEX clopyralid Stinger 4 fluthiacet fenoxaprop Tecoma 1 flumetsulam Python 2 Cadet Foxfire acifluorfen pinoxaden Axial XL 1 2,4-D 2,4-D 4 Ultra Blazer Trump Card Diphenylether fomesafen acetochlor TopNotch 15 fluroxypyr Starane 4 14 PPO Inhibitors 2 Flexstar, Reflex, others FulTime lactofen atrazine AAtrex 5 flumioxazin Valor 14 Cobra, Phoenix Valor XLT flumiclorac Resource fluazifop Fusilade DX 1 chlorimuron Classic 2 N-phenylphthalimide Fusion flumioxazin fenoxaprop Puma 1 hexazinone Velpar 5 Valor Velpar AlfaMax Pyrimidinedione saflufenacil flumioxazin Valor 14 diuron Karmex 7 Sharpen Gangster 2 14 Photosystem I diquat Reglone cloransulam FirstRate saflufenacil Sharpen 22 5 Bipyridylium Verdict Electron Diverter paraquat Gramoxone SL pyroxsulam PowerFlex HL 2 dimethenamid-P Outlook 15 GoldSky florasulam ––––– 2 MCPA MCPA 4 Seedling Root Growth Inhibitors fluroxypyr Starane 4 Weld fluroxypyr Starane 4 Amide pronamide Kerb Guardsman Max dimethenamid-P Outlook 15 clopyralid Stinger 4 (G-Max Lite) ethalfluralin atrazine AAtrex 5 clopyralid Stinger 4 Sonalan Widematch 3 Microtubule Inhibitors 6 s-metolachlor Dual Magnum 15 fluroxypyr Starane 4 Dinitroaniline pendimethalin Prowl H2O, others trifluralin Treflan, others Halex GT mesotrione Callisto 27 fenoxaprop Tecoma 1 glyphosate glyphosate 9 Wolverine pyrasulfotole ----- 27 Seedling Shoot Growth Inhibitors acetochlor Harness 15 bromoxynil Buctril 6 Harness Xtra butylate atrazine AAtrex 5 dicamba Banvel 4 Sutan + Yukon cycloate Ro-Neet clopyralid Stinger 4 halosulfuron Permit 2 Lipid Synthesis Inhibitor Hornet Thiocarbamate EPTC Eradicane, Eptam flumetsulam Python 2 mesotrione Callisto 27 8 (not ACCase) 5 Zemax thiobencarb pyrasulfotole ––––– 27 s-metolachlor Dual II Magnum 15 Bolero Huskie triallate Far-Go bromoxynil Buctril 6 Degree, Harness, Surpass, acetochlor Topnotch, Warrant, others *Indicates product is not registered for use at the time of printing. Check for a label and Material Safety Data Sheet at www.cdms.net to confirm status. Chloroacetamide alachlor Intrro, Micro-Tech Long-chain fatty acid 1 s-metolachlor Dual Magnum, others 15 Inhibitors dimethenamid-P Outlook Technical editing for this publication was led by Christy Sprague, Ph. D., Michigan State University in partnership with other universities in the soybean-growing regions of the United States. For more information and links to additional resources, visit TakeActionOnWeeds.com. Oxyacetamide flufenacet Define Take Action is supported by BASF, Bayer, DuPont, Dow, Monsanto, and Syngenta. Pyrazole pyroxasulfone Zidua

16 Specific site unknown 0 Benzofurane ethofumesate Nortron

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17 Nucleic Acid Inhibitor 1 Arsenical MSMA MSMA The United Soybean Board neither recommends nor discourages the implementation of any advice contained herein, and is not liable for the use or misuse of the information provided. ©2013 United Soybean Board