HERBICIDE CLASSIFICATION Repeated use of herbicides with the same site of action can result in the development of herbicide-resistant weed populations. This chart groups herbicides by their modes of action to assist you in selecting This chart lists premix herbicides alphabetically by their trade names by MODE OF herbicides 1) to maintain greater diversity in herbicide use and 2) to rotate by PREMIX so you can identify the premix’s component herbicides and their respective ACTION among effective herbicides with different sites of action to delay the development site-of-action groups. Refer to the Site-of-Action chart on the left (effect on plant growth) of herbicide resistance. for more information. SITEOFACTION NUMBER OF RESISTANT COMPONENT COMPONENT GROUP WEED SPECIES IN U.S. SITEOFACTION SITEOFACTION GROUP GROUP CHEMICAL ACTIVE PRODUCT ACTIVE TRADE ACTIVE TRADE SITE OF ACTION FAMILY INGREDIENT EXAMPLES PREMIX ® PREMIX ® (TRADE NAME®) INGREDIENT NAME INGREDIENT NAME LIPID SYNTHESIS INHIBITORS bicyclopyrone ––––– 27 acetochlor Harness 15 HARNESS XTRA clodinafop Discover NG mesotrione Callisto 27 atrazine AAtrex 5 ACURON cyhalofop Clincher atrazine AAtrex 5 clopyralid Stinger 4 Aryloxyphenoxypropio- fenoxaprop Ricestar, Tecoma, others HORNET nate (fops) s-metolachlor Dual II Magnum 15 flumetsulam Python 2 ACCASE INHIBITORS fluazifop Fusilade DX bicyclopyrone ––––– 27 pyrasulfotole ––––– 27 1 (acetyl CoA carboxylase) 15 HUSKIE quizalofop Assure II, Targa Acuron Flexi mesotrione Callisto 27 bromoxynil Buctril 6 clethodim Select Max, others Cyclohexanedione (dims) s-metolachlor Dual II Magnum 15 pyrasulfotole ––––– 27 sethoxydim Poast, Poast Plus AFFINITY BROADSPEC thifensulfuron Harmony 2 HUSKIE COMPLETE bromoxynil Buctril 6 Phenylpyrazolin pinoxaden Axial XL (Affinity Tankmix) tribenuron Express 2 thiencarbazone Varro 2 thifensulfuron Harmony 2 rimsulfuron Resolve, Matrix 2 AMINO ACID SYNTHESIS INHIBITORS INSTIGATE AFFORIA tribenuron Express 2 mesotrione Callisto 27 imazamox Raptor, Beyond, Clearmax flumioxazin Valor 14 KEYSTONE NXT acetochlor Surpass NXT 15 imazapic Plateau (Keystone LA NXT) Imidazolinone dicamba Clarity 4 atrazine AAtrex 5 imazaquin Scepter thifensulfuron Harmony 2 2,4-D 2,4-D, others 4 AGILITY SG imazethapyr Pursuit, Newpath tribenuron Express 2 KOCHIAVORE fluroxypyr Starane 4 bispyribac Regiment Pyrimidinylthiobenzoic acid metsulfuron Ally 2 bromoxynil Buctril, others 6 pyrithiobac Staple thifensulfuron Harmony 2 rimsulfuron Resolve 2 LEADOFF flucarbazone Everest, Pre-Pare, Sierra ALLY EXTRA tribenuron Express 2 thifensulfuron Harmony 2 Sulfonylaminocarbonyltri- propoxycarbazone Olympus azolinones metsulfuron Ally 2 mesotrione Callisto 27 thiencarbazone Varro pyroxasulfone Zidua 15 LEXAR EZ s-metolachlor Dual II Magnum 15 bensulfuron Londax ANTHEM ATZ fluthiacet Cadet 14 atrazine AAtrex 5 chlorimuron Classic atrazine AAtrex 5 mesotrione Callisto 27 chlorsulfuron Glean pyroxasulfone Zidua 15 LUMAX EZ s-metolachlor Dual II Magnum 15 ANTHEM FLEX halosulfuron Permit carfentrazone Aim 14 atrazine AAtrex 5 iodosulfuron Autumn pyroxasulfone Zidua 15 fluthiacet Cadet 14 ANTHEM MAXX MARVEL mesosulfuron Osprey fluthiacet Cadet 14 fomesafen Flexstar 14 ALS INHIBITORS metsulfuron Ally tropramezone Armezon 27 clomazone Command 13 2 (acetolactate synthase) 47 ARMEZON PRO OBEY nicosulfuron Accent Q, Zest dimethenamid-P Outlook 15 quinclorac Facet 4 orthosulfamuron Strada sulfentrazone Spartan 14 saflufenacil Sharpen 14 Sulfonylurea AUTHORITY ASSIST OPTILL primisulfuron Beacon imazethapyr Pursuit 2 imazethapyr Pursuit 2 prosulfuron Peak sulfentrazone Spartan 14 saflufenacil Sharpen 14 AUTHORITY ELITE rimsulfuron Resolve, Matrix s-metolachlor Dual Magnum 15 OPTILL PRO imazethapyr Pursuit 2 sulfosulfuron Maverick sulfentrazone Spartan 14 dimethenamid-P Outlook 15 AUTHORITY FIRST thifensulfuron Harmony cloransulam FirstRate 2 florasulam ––––– 2 ORION triasulfuron Amber sulfentrazone Spartan 14 MCPA MCPA 4 AUTHORITY MTZ tribenuron Express metribuzin Metribuzin 5 thifensulfuron Harmony 2 trifloxysulfuron Envoke PANOFLEX AUTHORITY XL sulfentrazone Spartan 14 tribenuron Express 2 triflusulfuron UpBeet (Authority Maxx) chlorimuron Classic 2 thifensulfuron Harmony 2 PERMIT PLUS cloransulam FirstRate iodosulfuron Autumn 2 halosulfuron Permit 2 AUTUMN SUPER florasulam component of Orion thiencarbazone Varro 2 s-metolachlor Dual Magnum 15 PREFIX Triazolopyrimidine flumetsulam Python, Accolade pinoxaden Axial XL 1 fomesafen Reflex 14 AXIAL STAR penoxsulam Grasp fluroxypyr Starane 4 rimsulfuron Resolve 2 PREQUEL pyroxsulam PowerFlex HL flufenacet Define 15 isoxaflutole Balance 27 AXIOM EPSP SYNTHASE INHIBITOR metribuzin Metribuzin 5 desmedipham Betenex 5 Roundup, Touchdown, (5-enolpyruvyl-shikimate- Organophosphorus glyphosate rimsulfuron Resolve 2 PROGRESS phenmedipham ––––– 5 9 15 several BASIS BLEND 3-phosphate) thifensulfuron Harmony 2 ethofumesate Nortron 16 desmedipham Betenex 5 dicamba Clarity 4 BETAMIX PULSAR 4 GROWTH REGULATORS phenmedipham ––––– 5 fluroxypyr Starane BICEP II MAGNUM s-metolachlor Dual II Magnum 15 halauxifen Arylex 4 Arylpicolinate halauxifen Arylex*, Elevore* QUELEX (Bicep Lite II Magnum) atrazine AAtrex 5 florasulam ––––– 2 Banvel, Clarity, DiFlexx, Engenia, Benzoic acid dicamba FeXapan*, XtendiMax, others s-metolachlor Dual Magnum 15 triasulfuron Amber 2 BOUNDARY RAVE aminopyralid Milestone metribuzin Metribuzin 5 dicamba Clarity 4 4 fomesafen Flexstar 14 flucarbazone Everest 2 T1R1 AUXIN RECEPTORS clopyralid Stinger BRAKE F2 RAZE (synthetic auxins) 8 Carboxylic acid fluroxypyr Starane fluridone Sonar 12 fluroxypyr Starane 4 BREAKFREE NXT ATZ acetochlor Breakfree NXT 15 rimsulfuron Resolve 2 triclopyr Grandstand REALM Q quinclorac Facet (Breakfree NXT Lite) atrazine AAtrex 5 mesotrione Callisto 27 2,4-D 2,4-D, others s-metolachlor Dual Magnum 15 cyhalofop Clincher 1 Phenoxy BROADAXE XC REBELEX MCPA MCPA, others sulfentrazone Spartan 14 penoxsulam Grasp 2 carfentrazone Aim 14 clopyralid Stinger 4 Semicarbazone diflufenzopyr component of Status BROADHEAD 19 AUXIN TRANSPORT INHIBITOR 0 quinclorac Facet 4 RESICORE acetochlor Surpass NXT 15 bromoxynil Buctril 6 mesotrione Callisto 27 BRONATE PHOTOSYNTHESIS INHIBITORS MCPA MCPA 4 rimsulfuron Resolve 2 RESOLVE Q desmedipham Betenex mesotrione Callisto 27 thifensulfuron Harmony 2 Phenylcarbamate CALLISTO GT glyphosate glyphosate 9 nicosulfuron Accent Q 2 phenmedipham component of Betamix REVULIN Q mesotrione Callisto 27 mesotrione Callisto 27 atrazine AAtrex, others CALLISTO XTRA atrazine AAtrex 5 propoxycarbazone Olympus 2 PHOTOSYSTEM II INHIBITORS Triazine prometryn Caparol RIMFIRE MAX 5 (different binding than 6 & 7) 26 chlorimuron Classic 2 mesosulfuron Osprey 2 simazine Princep CANOPY hexazinone Velpar metribuzin Metribuzin 5 dicamba XtendiMax 4 Triazinone ROUNDUP XTEND* chlorimuron Classic 2 glyphosate glyphosate 9 metribuzin Metribuzin, others CANOPY EX tribenuron Express 2 flumioxazin Valor 14 Uracil terbacil Sinbar ROWEL FX thiencarbazone Varro 2 chlorimuron Classic 2 PHOTOSYSTEM II INHIBITORS Benzothiadiazole bentazon Basagran, others CAPRENO 6 (different binding than 5 & 7) 1 tembotrione Laudis 27 thifensulfuron Harmony 2 Nitrile bromoxynil Buctril, others SENTRALLAS Amide propanil SuperWham MCPA MCPA 4 fluroxypyr Starane 4 diuron Direx, Karmex CARNIVORE clopyralid Stinger 4 s-metolachlor Dual Magnum 15 PHOTOSYSTEM II INHIBITORS 9 SEQUENCE 7 (different binding than 5 & 6) Urea fluometuron Cotoran bromoxynil Buctril 6 glyphosate glyphosate 9 glufosinate Cheetah 10 mesotrione Callisto 27 linuron Lorox, Linex CHEETAH MAX SOLSTICE fomesafen Reflex 14 fluthiacet Cadet 14 NITROGEN METABOLISM INHIBITOR CINCH ATZ s-metolachlor Dual II Magnum 15 sulfentrazone Spartan 14 SONIC (Cinch ATZ Lite) GLUTAMINE SYNTHETASE atrazine AAtrex 5 cloransulam FirstRate 2 Organophosphorus glufosinate Liberty, Cheetah 10 INHIBITOR 1 quinclorac Facet 4 sulfentrazone Spartan 14 CLEARPATH SPARTAN CHARGE imazethapyr Newpath 2 carfentrazone Aim 14 PIGMENT INHIBITORS COLT + SALVO 2,4-D 2,4-D 4 clopyralid Stinger 4 STANZA (Trump Card) PHYTOENE DESATURASE fluroxypyr Starane 4 flumetsulam Python 2 none recognized fluridone Sonar 12 (PDS) INHIBITOR 1 MCPA MCPA 4 florasulam ––––– 2 COLT + SWORD STARANE FLEX DOXP SYNTHASE INHIBITOR fluroxypyr Starane 4 fluroxypyr Starane 4 Isoxazolidinone clomazone Command 13 (1DEOXYDXYULOSE 5PHOSPHATE) 1 thiencarbazone Varro 2 fluroxypyr Starane 4 CORVUS STARANE NXT Isoxazole isoxaflutole Balance Flexx isoxaflutole Balance Flexx 27 bromoxynil Buctril 6 clopyralid Stinger 4 diflufenzopyr ––––– 19 Pyrazole pyrasulfotole component of Huskie CURTAIL STATUS Pyrazolone topramezone Armezon, Impact 2,4-D 2,4-D 4 dicamba Clarity 4 27 HPPD INHIBITORS 2 clopyralid Stinger 4 nicosulfuron Accent Q 2 mesotrione Callisto CURTAIL M STEADFAST Q Triketone tembotrione Laudis MCPA MCPA 4 rimsulfuron Resolve 2 Acuron acetochlor Degree 15 bentazon Basagran 6 bicyclopyrone component of DEGREE XTRA STORM atrazine AAtrex 5 acifluorfen Ultra Blazer 14 CELL MEMBRANE DISRUPTERS dicamba DiFlexx 4 fluroxypyr Starane 4 DIFLEXX DUO sulfentrazone Spartan tembotrione Laudis 27 SUPREMACY thifensulfuron Harmony 2 Aryl triazinone carfentrazone Aim chlorimuron Classic 2 tribenuron Express 2 DILIGENT* rimsulfuron Resolve 2 prometryn Caparol 5 fluthiacet Cadet SUPREND acifluorfen Ultra Blazer flumioxazin Valor 14 trifloxysulfuron Envoke 2 2,4-D 2,4-D 4 acetochlor Surpass NXT 15 14 PPO INHIBITORS 3 Diphenylether fomesafen Flexstar, Reflex, others ENLIST DUO lactofen Cobra, Phoenix glyphosate