The Herbicide Classifi cation Chart is your QUICK START GUIDE most important tool for taking action against HOW TO USE THE HERBICIDE your worst weeds. By knowing herbicide groups by their site of action (SOA), you CLASSIFICATION CHART can diversify your herbicide applications to reduce your risk of herbicide resistance. The left half of the chart classifi es herbicides by HERBICIDE their mode of action (MOA). CLASSIFICATION REPEATED USE OF HERBICIDES WITH THE SAME SITE OF ACTION CAN RESULT IN THE DEVELOPMENT OF HERBICIDE-RESISTANT WEED POPULATIONS. For example, Groups 2 and 9 are both Amino Acid 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. Synthesis Inhibitors, which means their MOA is to SITE-OF-ACTION NUMBER OF COMPONENT COMPONENT GROUP RESISTANT WEED SPECIES SITE-OF-ACTION SITE-OF-ACTION IN U.S. GROUP GROUP shut down amino acid production necessary for SITE OF CHEMICAL ACTIVE PRODUCT ACTIVE TRADE ACTIVE TRADE ACTION FAMILY INGREDIENT EXAMPLES (TRADE NAME®) PREMIX INGREDIENT NAME® PREMIX INGREDIENT NAME® LIPID SYNTHESIS INHIBITORS bicyclopyrone ––––– 27 acetochlor Harness 15 HARNESS XTRA clodinafop Discover NG mesotrione Callisto 27 atrazine AAtrex 5 ACURON* cyhalofop Clincher protein synthesis. atrazine AAtrex 5 clopyralid Stinger 4 Aryloxyphenoxypro- fenoxaprop HORNET pionate (fops) Ricestar, Tecoma, others s-metolachlor Dual II Magnum 15 flumetsulam Python 2 fluazifop Fusilade DX ACCASE INHIBITORS AFFINITY BROADSPEC thifensulfuron Harmony 2 pyrasulfotole ––––– 27 1 15 HUSKIE (acetyl CoA carboxylase) quizalofop Assure II, Targa (Affinity Tankmix) tribenuron Express 2 bromoxynil Buctril 6 clethodim Select Max, others Cyclohexanedione (dims) thifensulfuron Harmony 2 pyrasulfotole ––––– 27 sethoxydim Poast, Poast Plus AFFORIA tribenuron Express 2 HUSKIE COMPLETE bromoxynil Buctril 6 Phenylpyrazolin pinoxaden Axial XL flumioxazin Valor 14 thiencarbazone Varro 2 dicamba Clarity 4 rimsulfuron Resolve, Matrix 2 AMINO ACID SYNTHESIS INHIBITORS INSTIGATE thifensulfuron Harmony 2 mesotrione Callisto 27 AGILITY SG imazamox Raptor, Beyond, Clearmax tribenuron Express 2 KEYSTONE NXT acetochlor Surpass NXT 15 imazapic Plateau (Keystone LA NXT) Imidazolinone metsulfuron Ally 2 atrazine AAtrex 5 But Groups 2 and 9 are also broken into their SOA. imazaquin Scepter thifensulfuron Harmony 2 rimsulfuron Resolve 2 LEADOFF imazethapyr Pursuit, Newpath ALLY EXTRA tribenuron Express 2 thifensulfuron Harmony 2 Pyrimidinylthiobenzoic bispyribac Regiment metsulfuron Ally 2 mesotrione Callisto 27 acid pyrithiobac Staple pyroxasulfone Zidua 15 LEXAR EZ s-metolachlor Dual II Magnum 15 ANTHEM flucarbazone Everest, Pre-Pare, Sierra fluthiacet Cadet 14 atrazine AAtrex 5 Sulfonylaminocarbonyl- Group 2 are ALS inhibitors, which inhibits the enzyme propoxycarbazone Olympus triazolinones pyroxasulfone Zidua 15 mesotrione Callisto 27 thiencarbazone Varro ANTHEM ATZ fluthiacet Cadet 14 LUMAX EZ s-metolachlor Dual II Magnum 15 bensulfuron Londax atrazine AAtrex 5 atrazine AAtrex 5 chlorimuron Classic pyroxasulfone Zidua 15 dicamba Clarity 4 ANTHEM FLEX MARKSMAN chlorsulfuron Glean carfentrazone Aim 14 atrazine AAtrex 5 halosulfuron Permit sulfentrazone 14 fluthiacet 14 acetolactate synthase (ALS) as their SOA, while Group 9 Spartan Cadet AUTHORITY ASSIST MARVEL iodosulfuron Autumn imazethapyr Pursuit 2 fomesafen Flexstar 14 mesosulfuron Osprey sulfentrazone Spartan 14 primisulfuron Beacon 2 AUTHORITY ELITE NORTHSTAR ALS INHIBITORS metsulfuron Ally 2 45 s-metolachlor Dual Magnum 15 dicamba Clarity 4 (acetolactate synthase) nicosulfuron Accent Q sulfentrazone Spartan 14 clomazone Command 13 AUTHORITY FIRST OBEY orthosulfamuron Strada Sulfonylurea cloransulam FirstRate 2 quinclorac Facet 4 includes glyphosate, which inhibits the chloroplast primisulfuron Beacon sulfentrazone Spartan 14 saflufenacil Sharpen 14 AUTHORITY MTZ OPTILL prosulfuron Peak metribuzin Metribuzin 5 imazethapyr Pursuit 2 rimsulfuron Resolve, Matrix AUTHORITY XL sulfentrazone Spartan 14 saflufenacil Sharpen 14 sulfosulfuron Maverick (Authority Maxx) chlorimuron Classic 2 OPTILL PRO imazethapyr Pursuit 2 thifensulfuron Harmony iodosulfuron Autumn 2 dimethenamid-P Outlook 15 AUTUMN SUPER enolpyruvyl shikimate-3-phosphate synthase (EPSPS) triasulfuron Amber thiencarbazone Varro 2 florasulam ––––– 2 ORION tribenuron Express pinoxaden Axial XL 1 MCPA MCPA 4 AXIAL STAR trifloxysulfuron Envoke fluroxypyr Starane 4 thifensulfuron Harmony 2 PANOFLEX triflusulfuron UpBeet rimsulfuron Resolve 2 tribenuron Express 2 BASIS BLEND cloransulam FirstRate thifensulfuron Harmony 2 thifensulfuron Harmony 2 PERMIT PLUS florasulam component of Orion as the SOA. desmedipham Betenex 5 halosulfuron Permit 2 BETAMIX Triazolopyrimidine flumetsulam Python, Accolade phenmedipham ––––– 5 s-metolachlor Dual Magnum 15 PREFIX penoxsulam Grasp BICEP II MAGNUM s-metolachlor Dual II Magnum 15 fomesafen Reflex 14 pyroxsulam PowerFlex HL (Bicep Lite II Magnum) atrazine AAtrex 5 rimsulfuron Resolve 2 PREQUEL EPSP SYNTHASE INHIBITOR s-metolachlor Dual Magnum 15 isoxaflutole Balance 27 Roundup, Touchdown, BOUNDARY (5-enolpyruvyl-shikimate- Organophosphorus glyphosate metribuzin Metribuzin 5 carfentrazone Aim 14 9 14 several PRIORITY 3-phosphate) fomesafen Flexstar 14 halosulfuron Permit 2 BRAKE F2 fluridone Sonar 12 desmedipham Betenex 5 acetochlor 15 PROGRESS phenmedipham 5 GROWTH REGULATORS BREAKFREE NXT ATZ Breakfree NXT ––––– (Breakfree NXT Lite) atrazine AAtrex 5 ethofumesate Nortron 16 Arylpicolinate halauxifen component of Quelex* s-metolachlor Dual Magnum 15 dicamba Clarity 4 Benzoic acid dicamba Banvel, Clarity, DiFlexx*, others The right half of the chart lists specifi c herbicides BROADAXE PULSAR sulfentrazone Spartan 14 fluroxypyr Starane 4 clopyralid Stinger carfentrazone Aim 14 halauzifen ––––– 4 T1R1 AUXIN RECEPTORS fluroxypyr Starane BROADHEAD QUELEX* 4 8 Carboxylic acid quinclorac Facet 4 florasulam ––––– 2 (synthetic auxins) triclopyr Grandstand bromoxynil Buctril 6 triasulfuron Amber 2 quinclorac Facet, Paramount BRONATE RAVE MCPA MCPA 4 dicamba Clarity 4 2,4-D 2,4-D, others or premixes by their sites of action (SOA). Phenoxy alachlor Micro-Tech 15 flucarbazone Everest 2 MCPA MCPA, others BULLET RAZE atrazine AAtrex 5 fluroxypyr Starane 4 19 AUXIN TRANSPORT INHIBITOR 0 Semicarbazone diflufenzopyr component of Status mesotrione Callisto 27 rimsulfuron Resolve 2 CALLISTO GT REALM Q glyphosate glyphosate 9 mesotrione Callisto 27 mesotrione Callisto 27 cyhalofop Clincher 1 PHOTOSYNTHESIS INHIBITORS CALLISTO XTRA REBELEX atrazine AAtrex 5 penoxsulam Grasp 2 desmedipham Betenex Phenylcarbamate chlorimuron Classic 2 rimsulfuron Resolve 2 phenmedipham component of Betamix CANOPY REQUIRE Q metribuzin Metribuzin 5 dicamba Clarity 4 atrazine AAtrex, others chlorimuron Classic 2 rimsulfuron Resolve 2 PHOTOSYSTEM II INHIBITORS Triazine prometryn Caparol CANOPY EX RESOLVE Q 5 26 tribenuron Express 2 thifensulfuron Harmony 2 (different binding than 6 & 7) simazine Princep thiencarbazone Varro 2 bentazon Basagran 6 Premixes on this chart are listed by the most common hexazinone Velpar CAPRENO REZULT Triazinone tembotrione Laudis 27 sethoxydim Poast 1 metribuzin Metribuzin, others MCPA MCPA 4 propoxycarbazone Olympus 2 Uracil terbacil Sinbar RIMFIRE MAX CARNIVORE clopyralid Stinger 4 mesosulfuron Osprey 2 PHOTOSYSTEM II INHIBITORS Benzothiadiazole bentazon Basagran, others 6 1 bromoxynil Buctril 6 s-metolachlor Dual Magnum 15 (different binding than 5 & 7) Nitrile bromoxynil Buctril, others SEQUENCE s-metolachlor Dual II Magnum 15 glyphosate glyphosate 9 Amide propanil SuperWham CINCH ATZ brand names. If you use a generic brand, you will (Cinch ATZ Lite) atrazine AAtrex 5 atrazine AAtrex 5 PHOTOSYSTEM II INHIBITORS diuron Direx, Karmex SHOTGUN 7 9 quinclorac Facet 4 2,4-D 2,4-D 4 (different binding than 5 & 6) Urea fluometuron Cotoran CLEARPATH imazethapyr Newpath 2 mesotrione Callisto 27 linuron Lorox, Linex SOLSTICE COLT + SALVO 2,4-D 2,4-D 4 fluthiacet Cadet 14 (Trump Card) fluroxypyr Starane 4 sulfentrazone Spartan 14 NITROGEN METABOLISM INHIBITOR SONIC 4 2 need to look up the common brand equivalent or the MCPA MCPA cloransulam FirstRate GLUTAMINE SYNTHETASE COLT + SWORD 10 1 Organophosphorus glufosinate Liberty fluroxypyr Starane 4 sulfentrazone Spartan 14 INHIBITOR SPARTAN CHARGE thiencarbazone Varro 2 carfentrazone Aim 14 CORVUS isoxaflutole Balance Flexx 27 prosulfuron Peak 2 PIGMENT INHIBITORS SPIRIT clopyralid Stinger 4 primisulfuron Beacon 2 PHYTOENE DESATURASE CURTAIL 12 1 none recognized fluridone Sonar 2,4-D 2,4-D 4 clopyralid Stinger 4 active ingredients. (PDS) INHIBITOR STANZA clopyralid Stinger 4 flumetsulam Python 2 DOXP SYNTHASE INHIBITOR CURTAIL M 13 1 Isoxazolidinone clomazone Command MCPA MCPA 4 florasulam ––––– 2 (1-DEOXY-D-XYULOSE 5-PHOSPHATE) STARANE FLEX acetochlor Degree 15 fluroxypyr Starane 4 Isoxazole isoxaflutole Balance Flexx DEGREE XTRA atrazine AAtrex 5 fluroxypyr Starane 4 Pyrazole pyrasulfotole component of Huskie STARANE NXT 2,4-D 2,4-D 4 bromoxynil Buctril 6 Pyrazolone topramezone Armezon,