Herbicide Group Classification by Mode of Action

• Loss of control is observed. One pest may escape control while other pest species are controlled.
• Was pesticide performance adversely affected by weather conditions or misapplication?
• Does the field history indicate repeated use of one or more pesticides with a similar mode of action?
• Did the pest infestation occur after pesticide application?

Herbicide Group Classification by Mode of Action
Chemical family	Active ingredients	Found in*
Group 1	Inhibitors of acetyl CoA carboxylase ACCase. These chemicals block an enzyme called ACCase. This enzyme helps the formation of lipids in the roots of grass plants. Without lipids, susceptible weeds die.
Aryloxyphenoxy propionate (Fop)	clodinafop-propargyl	Bullwhip Cadillac Cougar	Foothills SG Harmony Grass 240EC Horizon SG	Ladder MPower Aurora NextStep SG	Signal Signal FSU Traxos
	fenoxyprop-p-ethyl	Bengal Cordon	MPower Hellcat Puma Advance	Puma Super Tundra	Vigil WildCat
	quizalofop-p-ethyl	Assure ll	IPCO Contender	Yuma
Cyclohexanediones (Dim)	clethodim	Arrow 240 EC Centurion	Patron Select	Shadow RTM
	sethoxydim	Odyssey Ultra/Odyssey Ultra NXT	Poast Ultra
	tralkoxydim	Bison	Liquid Achieve	Marengo	Nufarm Tralkoxydim
Phenylpyrazolin (Den)	pinoxaden	Axial Axial iPak	Axial Xtreme Broadband	Traxos Traxos Two
Group 2	ALS/AHAS inhibitors. These chemicals block the normal function of an enzyme called acetolactate (ALS) actohydroxyacid synthase (AHAS). This enzyme is essential in amino acid (protein) synthesis. Without proteins, plants starve to death.
Imidazolinones	AC 299, 263, 120 AS	Altitude FX
	imazamethabenz	Assert 300	Avert
	imazamox	Ares Altitude FX2	Davai Mizuna	Salute Solo/Solo ADV	Tensile Viper
	imazamox + imazethapyr	Duet	Odyssey/Odyssey NXT	Odyssey Ultra/Odyssey Ultra NXT
	imazapyr	Ares	Arsenal	Salute
	imazethapyr	Gladiator Multistar	MPOWER Kamikaze Nu-Image Herbicide	Phantom Pursuit
Sulfonylamino- carbonyltriazolinones	flucarbazone sodium	Everest	Inferno Duo
Sulfonylureas	chlorsulfuron	Telar	Truvist
	ethametsulfuron methyl	Muster
	metsulfuron-methyl	Accurate Ally Toss-N-Go	Escort Express Pro	Nuance Pro Reclaim/Reclaim II	Travallas
	nicosulfuron	Accent
	rimsulfuron	Prism	Titus Pro
	thifensulfuron-methyl	Barricade Boost Broadside	Deploy Nimble Predicade	Refine SG Retain Travallas	Triton C
	tribenuron-methyl	Barricade Boost Broadside Deploy Express FX Express Pack Express Pro	Express SG FirstStep Complete Inferno Duo Inferno WDG KoAct Luxxur	MPowerR MPowerX Nimble Nuance Nuance Pro Predicade	Refine SG Refine M Retain Signal FSU Triton C Triton K
	triflusulfuron methyl	UpBeet
Pyrazole	halosulfuron	Permit
Triazolpyramidines	florasulam	Benchmark Blitz Broadband Cirpreme First Pass	Frontline XL Frontline 2, 4-D Hotshot Korrex II Outshine	Paradigm PrePass PrePass Flex Priority Spectrum	Spitfire Stellar/Stellar XL Topline
	pyroxsulam	GoDRI	Simplicity/Simplicity	Tandem
Triazolones	thiencarbazone-methyl	Luxxur	Predicade	Varro	Velocity m3
Group 3	Microtubule assembly inhibitors. These chemicals inhibit the cell division in roots.
Dinitroanilines	ethalfluralin	Edge
	trifluralin	Bonanza	Fortress MicroActiv	Rival	Treflan
Group 4	Synthetic auxins. These chemicals disrupt plant cell growth in the newly forming stems and leaves; they affect protein synthesis and normal cell division, leading to malformed growth and tumors.
Benzoic acids	dicamba	Banvel ll Distinct Engenia Express FX	GlyKamba Xtendimax Korrex II Pulsar	Roundup Xtend Sword Target TrackerXP	Triton K Vanquish VMD 480
Carboxylic acids	aminocy-clopyrachlor	Navist	Truvist
	fluroxypyr	Altitude FX Attain XC Axial Xtreme Barricade Enforcer D Enforcer M	Flurox-24 ForceFighter M Hat Trick Infinity FX Momentun Outshine	Pixxaro Predicade Prestige XC Pulsar Retain SG Rush M	Signal FSU Stellar/Stellar XL Tandem Travallas Traxos Two Trophy
	quinclorac	Clever	Masterline Quinclorac	Triton C
Picolinic acid	aminopyralid	Reclaim/Reclaim II	Restore ll
	clopyralid	Curtail M Eclipse lll Hat Trick	Lontrel Momentum Prestige	Prestige XC Pyralid Salute	Spectrum Tensile
	halauxifen	Cirpreme	Paradigm	Pixxaro
	picloram	Grazon XC	Tordon 22K
Phenoxy	2,4-D	2,4-D Approve Attain XC/OcTTain Benchmark Calmix Pellets Desormone	Dichlorprop-DX Enforcer D Estaprop XT Flurox-24 Frontline, 2,4-D Grazon	Restore II Retain SG KoAct Leader Reclaim/Reclaim II Thrasher	Thumper Triton K Turboprop 600
	dichlorprop (2,4-DP)	Desormone	Dichlorprop-DX	Estaprop XT	Turboprop 600
	2,4-DB	2,4-DB	Caliber 625	Cobutox 625	Embutox 625
	MCPA	Badge Broadside Buctril M Clovitox Plus Curtail M Enforcer M ForceFighter M Frontline XL	Goldwing Hat Trick Logic M MCPA Mextrol Outshine Pixxaro Predicade	Prestige XC Refine M Rush M Spectrum Stellar/Stellar XL Sword Target TrackerXP	Topline Topside Trophy TropotoxPlus
	MCPB	Clovitox Plus	Topside	TropotoxPlus
	mecoprop (MCPP)	Mecoprop-P	Sword	Target	TrackerXP
Group 5	Photosynthetic inhibitors at Photosystem ll, Site A. These chemicals interfere with photosynthesis and disrupt plant growth, ultimately leading to death.
Phenyl-carbamates	desmedipham	Betamix	Betamix B
	phenmedipham	Betamix	Betamix B
Triazines	atrazine	Aatrex	Laddok	Primextra ll Magnum
	simazine	Princep Nine-T	Simazine 480
Triazinones	hexazinone	Velpar DF	Velpar DF CU
	metribuzin	Metrix	Sencor	Squadron	Titus Pro Tricor
	pyrazon	Pyramin
Uracils	bromacil	Calmix Pellets	Hyvar X/X-L	Krovar l
Group 6	Photosynthetic inhibitors at Photosystem ll, Site ll.
Benzthiadiazoles	bentazon	Basagran/Basagran Forte	Benta super	Laddok	Viper
Nitriles	bromoxynil	Approve Axial iPak Badge Bromax Bromotril ll Brotex 240	Buctril M Conquer Enforcer D Enforcer M ForceFighter M Hotshot	Infinity Infinity FX Koril Leader Logic M Mextrol	Pardner Thrasher Thumper Tundra Velocity m3
Group 7	Photosynthetic inhibitors at Photosystem ll, Site B.
Ureas	diuron	Diurex 80W	Karmex XP	Krovar l
	linuron	Linuron	Lorox
Group 8	Lipid synthesis inhibitors (not ACCase inhibition). These chemicals inhibit the cell division and elongation in the seedling shoots before they emerge above ground.
Thiocarbamates	EPTC	Eptam
	triallate	Avadex Liquid EC	Avadex MicroActiv	Fortress MicroActiv
Group 9	Inhibitors of EPSP synthesis. These chemicals inhibit the amino-acid synthesis.
None	glyphosate	Cleanstart Clearout 41 Credit 45 Credit Extreme Eclipse lll FirstStep Complete GlyKamba	Glyphogan Plus Guardman Knockout Extra Matrix MPower Glyphosate PrePass R/T 540	Roundup Roundup Transorb HC Roundup Xtend ShardaGlyphosate 360 Sharpshooter Sharpshooter Plus Smoke	StartUp Vector/Vector 540 VP 480 WeatherMax
Group 10	Inhibitors of glutamine synthetase
None	glufosinate-ammonium	Liberty 150 SN	MPower Good Harvest
Group 11	These chemicals inhibit the carotenoids biosynthesis.
Triazole	amitrol	Amitrol 240
Group 13	Inhibits DOXP, which is needed in plant metabolism.
Isoxazolidinone	clomazone	Command 360 ME
Group 14	Inhibits an enzyme of chlorophyll and heme biosynthesis
Aryl triazone	carfentrazone	Aim Authority Charge	Cleanstart Conquer	Focus/Focus SE
	flumioxazin	Chateau	Valtera
	pyraflufen-ethyl	Blackhawk	Goldwing
	saflufenacil	Heat
	sulfentrazone	Authority	Authority Charge
Group 15	Inhibitors of cell growth and division
Amide	dimethenamid-P	Outlook
Chloroacetamides	metolachlor	Dual ll Magnum	Primextra ll Magnum
Pyrazole	pyroxasulfone	Focus	Focus SE
Group 16	Unknown
Benzofuranyl alkylsulfonate	ethofumesate	Ethos SC	Nortron
Group 19	Auxin transport inhibitor allowing buildup in the meristem area
Semicarbazone	diflufenzopyr	Distinct
Group 20	Inhibits actively dividing merestems in roots and shoots as well as seed germination
Nitriles	dichlobenil	Casoron
Group 22	Cell membrane disrupters. Chemicals that disrupt the internal cell membrane and prevent the cells from manufacturing food.
Bipyridyliums	diquat	Armory Bolster Desiccant Craven Dessicash Desiccant	Diquat Diquat 240 DriFast Dessiccant Guardsman	Regione Desiccant Reglone 240 Desiccant Reglone Ion Reward	Stage Desiccant
	paraquat	Gramoxone
Group 27	Inhibits plant pigment biosynthesis and photosynthesis
Benzopyrazole	pyrasulfotole	Axial iPak Infinity	Infinity FX Tundra	Velocity m3
	topramezone	Armezon	Impact