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?

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	Foothills SG, Harmony K, Harmony Max, Harmony SG, Horizon SG, Ladder, MPower Aurora, NextStep SG, NuFarm clodinafop,Signal, Signal D, Signal M, Traxos
		fenoxyprop-p-ethyl	Bengal, Cordon, MPower Hellcat, Puma Super, Puma Advance, Tundra, Wildcat, Vigil
		quizalofop-p-ethyl	Assure II, Muster Gold II, Yuma
	Cyclohexanediones (Dim)	clethodim	Arrow 240 EC, Centurion, Select, Shadow RTM
		sethoxydim	Poast Ultra
		tepraloxydim	Equinox, FlaxMax DLX, Odyssey DLX
		tralkoxydim	Achieve Liquid Gold, Liquid Achieve, Titanium, Bison, Marengo
	Phenylpyrazolin (Den)	pinoxaden	Axial, Broadband, Traxos
Group 2
ALS/AHAS inhibitors. These chemicals block the normal function of an enzyme called acetolactate (ALS) actohydroxy acid (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, Assert FL, Avert
		imazamox	Adrenalin SC, Solo, Tensile, Viper
		imazamox + imazethapyr	Absolute, Odyssey, Odyssey DLX
		imazapyr	Arsenal
		imazethapyr	Gladiator, Multistar, Pursuit, MPower Kamekazi
	Sulfonylamino- carbonyltriazolinones	flucarbazone sodium	Everest, Pace, Prepare, Prepare Complete
	Sulfonylureas	chlorsulfuron	Telar
		ethametsulfuron methyl	Muster, Muster Gold II
		metsulfuron-methyl	Ally Toss-N-Go, Escort, Accurate, Express Pro, Reclaim
		nicosulfuron	Accent
		rimsulfuron	Prism
		thifensulfuron-methyl	Barricade, Broadside, Deploy, Harmony K, Harmony Max, Harmony SG, Nimble, Refine SG, Retain, Triton C
		tribenuron-methyl	Barricade, Broadside, Deploy, Express Pack, Express SG, Express Pro, FirstStep Complete,Harmony K, Harmony Max, Harmony SG, Nimble, , Nuance, Refine SG, Refine M, Retain, Spike-UpTriton C, Triton K
		triflusulfuron methyl	UpBeet
	Triazolpyramidines	florasulam	Assert FL, Benchmark, Broadband, Frontline, Frontline XL, Frontline 2, 4-D, PrePass, Spectrum, Stellar
		pyroxsulam	Simplicity, Tandem
	Triazolones	thiencarbazone-methyl	Velocity m3, Varro
Group 3
Microtubule assembly inhibitors. These chemicals inhibit the cell division in roots.	Dinitroanilines	ethalfluralin	Edge
		trifluralin	Bonanza, Fortress, 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 II, DyVel, DyVel DSp, Harmony K, Hawkeye Power, Oracle Dicamba, Pulsar, Rustler, Sword, Target, Takkle, Tracker XP, Triton K, Vanquish, VMD 480
	Carboxylic acids	clopyralid	Absolute, Curtail M, Eclipse lII, Lontrel, FlaxMax DLX, Prestige, Prestige XC, Spectrum, Tensile
		aminopyralid	Milestone, Restore, Reclaim
		fluroxypyr	Altitude FX, Attain XC, Barricade, Fluorex 24, Harmony Max, Prestige XC, Pulsar, Retain, Stellar, Tandem, Trophy
		picloram	Grazon, Tordon 22K
	Phenoxy	2,4-D	2,4-D, Adrenalin SC, Approve, Attain XC, Benchmark, Calmix Pellets, Desormone, DichlorpropDX, DyVel DSp, EstapropXT, Fluorex 24, Frontline 2,4-D, Grazon, Leader, Reclaim, Restore, Retain, Signal D, Thrasher, Thumper, Titanium, Triton K, Turboprop 600
		dichlorprop (2,4-DP)	Desormone, Dichlorprop-DX, Estaprop XT, Optica Trio, Turboprop 600
		2,4-DB	2,4-DB, Caliber 625, Cobutox 625, Embutox 625
		MCPA	Achieve Liquid Gold, Altitude FX, Assert FL, Badge, Broadside, Buctril M, Clovitox Plus, Curtail M, DyVel, FlaxMax DLX, Frontline, Frontline XL, Logic M, MCPA, Mextrol, Optica TrioPrestige XC, Refine M, Signal M, Spectrum, Stellar, Sword, Target, Tracker XP, Topside, Trophy, Tropotox Plus
		MCPB	Clovitox Plus, Topside, Tropotox Plus
		mecoprop (MCPP)	DyVel DSp, Mecoprop-P, Optica Trio, Sword, Target, Tracker XP
		quinclorac	Triton C
Group 5
Photosynthetic inhibitors at Photosystem II, Site A. These chemicals interfere with photosynthesis and disrupt plant growth, ultimately leading to death.	Phenyl-carbamates	desmedipham	Betamix, Betamix ß
		phenmedipham	Betamix, Betamix ß
	Triazines	atrazine	Atrazine, Laddok, Primextra II Magnum
		simazine	Princip Nine-T, Simazine 480
	Triazinones	hexazinone	Velpar DF, Velpar L
		metribuzin	Sencor
		pyrazon	Pyramin
	Uracils	bromacil	Calmix Pellets, Hyvar X/X-L, Krovar I
Group 6
Photosynthetic inhibitors at Photosystem II, Site II	Benzthiadiazoles	bentazon	Basagran, Basagran Forte, Laddok, Viper
	Nitriles	bromoxynil	Achieve Liquid Gold, Approve, Badge, Bromotril, Brotex 240, Buctril M, Infinity, Koril, Leader, Logic M, Mextrol, Pardner, Signal D, Signal M, Thrasher, Thumper, Titanium, Tundra, Velocity m3
Group 7
Photosynthetic inhibitors at Photosystem II, Site B.	Ureas	diuron	Diurex 80W, Karmex XP, Krovar I
		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 (Extra Strength) BW/MicroActiv, Fortress.
	Pyrazolium	difenzoquat	Avenge 200-C
Group 9
Inhibitors of EPSP synthesis. These chemicals inhibit the amino-acid synthesis.	None	glyphosate	Cheminova Glyphosate, Clearout 41, Cleanstart, Credit, Credit 45, Crush'R Plus, Eclipse III, Factor 540, FirstStep Complete, Glyphogan Plus, Glyfos, Knockout Extra, Matrix, Maverick III, MPower glyphosate, NuGlo,Pace, Polaris, Prepare, Prepare Complete, PrePass, Renegade, Roundup Transorb HC, Roundup Ultra2 Roundup WeatherMax, Rustler, R/T 540, Sharpshooter, Sharpshooter Plus, Spike-Up, StartUp,Takkle, Touchdown Total, Traxion, Vantage Plus Max II, Wise Up
Group 10
Inhibitors of glutamine synthetase.	None	glufosinate-ammonium	Liberty 150 SN
Group 11
These chemicals inhibit the carotenoids biosynthesis.	Triazole	amitrol	Amitrol 240
Group 14
Inhibits an enzyme of chlorophyll and heme biosynthesis.	Aryl triazone	carfentrazone	Cleanstart
		sulfentrazone	Authority
		saflufenacil	Heat
		flumioxazin	Payload
Group 15
Inhibitors of cell growth and division.	Chloroacetamides	metolachlor propyzamide	Dual II Magnum, Primextra II Magnum Kerb 50W
Group 16
Unknown	Benzofuranyl alkylsulfonate	ethofumesate	Ethos SC, Norton
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 paraquat	Reglone Desiccant, Reward Gramoxone
Group 27
Inhibits plant pigment biosynthesis and photosynthesis.	Pyrazole	pyrasulfotole	Infinity, Tundra, Velocity m3