Herbicide Group Classification by Mode of Action

 
 
Subscribe to our free E-Newsletter, "Agri-News" (formerly RTW This Week)Agri-News
This Week
 
 
 
 Pesticide Resistance
.The problem
Agricultural pests can develop resistance to fungicides, herbicides or insecticides. Resistance is the result of repeated use of one or more similar pesticides over a number of years. In Alberta, the potential exists for resistance to develop to a number of products. Producers should follow agronomic practices that both prevent or minimize the development of resistance and prevent the spread of existing resistant populations.

Pest biotypes resistant to one or more chemical pesticides occur naturally. Repeated use of either one pesticide or of pesticides with a similar mode of action can result in a build-up of resistance and a loss of control. Pesticide resistant biotypes do not differ in appearance from the susceptible biotypes. Therefore, it is extremely difficult to observe the progression of resistance until a loss of control is observed.

Identifying resistance
  • 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 familyActive ingredientsFound in*
Group 1Inhibitors 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-propargylBullwhip
Cougar
Foothills SG
Harmony Grass 240
Harmony K
Harmony Max
Harmony SG
Horizon SG
Ladder
MPower Aurora
NextStep SG
Signal D
Signal FSU
Signal M
Traxos
fenoxyprop-p-ethylBengal
Cordon
MPower Hellcat
Puma Super
Puma Advance
Tundra
WildCat
Vigil
quizalofop-p-ethylAssure llYuma
Cyclohexanediones
(Dim)
clethodimArrow 240 ECCenturionSelectShadow RTM
sethoxydimPoast UltraOdyssey Ultra
tralkoxydimBison
Liquid Achieve
Marengo
Nufam
Tralkoxydim
Phenylpyrazolin (Den)pinoxadenAxial
Axial iPak
Axial Xtreme
Broadband
Traxos
Traxos Two
Group 2ALS/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.
ImidazolinonesAC 299, 263, 120 ASAltitude FX
imazamethabenzAssert 300Avert
imazamoxAres
Salute
Solo
Tensile
Viper
imazamox + imazethapyrOdysseyOdyssey Ultra
imazapyrArsenalAresSalute
imazethapyrGladiator
Multistar
MPOWER Kamikaze
Nu-Image Herbicide
Pursuit
Sulfonylamino-
carbonyltriazolinones
flucarbazone sodiumEverest
Inferno Duo
Amidedimethenamid-POutlook
SulfonylureaschlorsulfuronTelarTruvist
ethametsulfuron methylMuster
metsulfuron-methylAccurate
Ally Toss-N-Go
Escort
Express Pro
Nuance Pro
Reclaim
Travallas
nicosulfuronAccent
rimsulfuronPrismTitus Pro
thifensulfuron-methylBarricade
Boost
Broadside
Deploy
Harmony K
Harmony Max
Harmony SG
Nimble
Predicade
Refine SG
Retain
Travallas
Triton C
tribenuron-methylBarricade
Boost
Broadside
Deploy
Express FX
Express Pack
Express Pro
Express SG
FirstStep Complete
Harmony K
Harmony Max
Harmony SG
Inferno Duo
Inferno WDG
KoAct
MPowerR
MPowerX
Nimble
Nuance
Nuance Pro
Predicade
Refine SG
Refine M
Retain
Signal FSU
Triton C
Triton K
triflusulfuron methylUpBeet
PyrazolehalosulfuronPermit
TriazolpyramidinesflorasulamBenchmark
Blitz
Broadband
Frontline
Frontline XL
Frontline 2, 4-D
Korrex
Outshine
Paradigm
PrePass
PrePass Flex
Priority
Spectrum
Spitfire
Stellar
Topline
pyroxsulamSimplicityTandem
Triazolonesthiencarbazone-methylPredicadeVarroVelocity m3
Group 3Microtubule assembly inhibitors. These chemicals inhibit the cell division in roots.
DinitroanilinesethalfluralinEdge
trifluralinBonanzaFortressRivalTreflan
Group 4Synthetic 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 acidsdicambaBanvel ll
Distinct
DyVel
DyVel DSp
Express FX
GlyKamba
Harmony K
Hawkeye Power
Korrex
Oracle Dicamba
Pulsar
Rustler
Sword
Target
Takkle
TrackerXP
Triton K
Vanquish
VMD 480
Carboxylic acidsclopyralidCurtail M
Exlipse lll
Hat Trick
Lontrel
Momentum
Prestige
Prestige XC
Salute
Spectrum
Tensile
aminopyralidReclaimRestore ll
fluroxypyrAltitude FX
Attain XC
Axial Xtreme
Barricade
Enforcer D
Enforcer M
Flurox-24
Harmony Max
Hat Trick
Momentun
Outshine
Pixxaro
Predicade
Prestige XC
Pulsar
Retain SG
Rush M
Signal FSU
Stellar
Tandem
Travallas
Traxos Two
Trophy
picloramGrazonTordon 22K
Picolinic acidhalauxifenParadigmPixxaro
Phenoxy2,4-D2,4-D
Approve
Attain XC
Benchmark
Calmix Pellets
Desormone
Dichlorprop-DX
DyVel DSp
Enforcer D
Estaprop XT
Flurox-24
Frontline, 2,4-D
Restore ll
Retain SG
Grazon
KoAct
Leader
Reclaim
Signal D
Thrasher
Thumper
Triton K
Turboprop 600
dichlorprop (2,4-DP)Desormone
Dichlarprop-DX
Estaprop XTOptica TrioTurboprop 600
2,4-DB2,4-DBCaliber 625Cobutox 625Embutox 625
MCPAAltitude FX
Badge
Broadside
Buctril M
Clovitox Plus
Curtail M
DyVel
Enforcer M
Frontline
Frontline XL
Hat Trick
Logic M
MCPA
Mextrol
Optica Trio
Outshine
Pixxaro
Predicade
Prestige XC
Refine M
Rush M
Signal M
Spectrum
Stellar
Sword
Target
TrackerXP
Topline
Topside
Trophy
TropotoxPlus
MCPBClovitox PlusTopsideTropotox Plus
mecoprop (MCPP)DyVel DSp
Mecoprop-P
Optica Trio
Sword
Target
TrackerXP
quincloracCleverMasterline QuincloracTriton C
aminocy-clopyrachlorNavistTruvist
Group 5Photosynthetic inhibitors at Photosystem ll, Site A.
These chemicals interfere with photosynthesis and disrupt plant growth, ultimately leading to death.
Phenyl-carbamatesdesmediphamBetamixBetamix B
phenmediphamBetamixBetamix B
TriazinesatrazineAatrexLaddokPrimextra ll Magnum
simazinePrincep Nine-TSimazine 480
TriazinoneshexazinoneVelpar DFVelpar DF CU
metribuzinSencorTitus Pro
pyrazonPyramin
UracilsbromacilCalmix PelletsHyvar X/X-LKrovar l
Group 6Photosynthetic inhibitors at Photosystem ll, Site ll.
BenzthiadiazolesbentazonBasagranBasagran ForteLaddokViper
NitrilesbromoxynilApprove
Axial iPak
Badge
Bromax
Bromotril ll
Brotex 240
Buctril M
Conquer
Enforcer D
Enforcer M
Infinity
Koril
Leader
Logic M
Mextrol
Pardner
Thrasher
Thumper
Tundra
Velocity m3
Group 7Photosynthetic inhibitors at Photosystem ll, Site B.
UreasdiuronDiurex 80WKarmex XPKrovar l
linuronLinuronLorox
Group 8Lipid synthesis inhibitors (not ACCase inhibition). These chemicals inhibit the cell division and elongation in the seedling shoots before they emerge above ground.
ThiocarbamatesEPTCEptam
triallateAvadex (Extra Strength) BW/Micro-ActivFortress
Group 9Inhibitors of EPSP synthesis. These chemicals inhibit the amino-acid synthesis.
NoneglyphosateClearout 41
Cleanstart
Credit 45
Eclipse lll
FirstStep Complete
Glyfos
GlyKamba
Crush'R Plus
Knockout Extra
Matrix
Maverick lll
MPower glyphosate
Pace
Prepare
Prepare Complete
PrePass
Renegade
Roundup Transorb HC
Roundup Ultra2
Roundup
WeatherMax
Rustler
R/T 540
Sharpshooter
Sharpshooter Plus
StartUp
Takkle
Touchdown Total
Traxion
Vantage Plus Max ll
Vector
Smoke
Group 10Inhibitors of glutamine synthetase
Noneglufosinate-ammoniumLiberty 150 SNMPower Good Harvest
Group 11These chemicals inhibit the carotenoids biosynthesis.
TriazoleamitrolAmitrol 240
Group 14Inhibits an enzyme of chlorophyll and heme biosynthesis
Aryl triazonecarfentrazoneAim
Authority Charge
Cleanstart
Conquer
Focus
sulfentrazoneAuthorityAuthority Charge
saflufenacilHeat
flumioxazinChateauValtera
Group 15Inhibitors of cell growth and division
ChloroacetamidesmetolachlorDual ll MagnumPrimextra ll Magnum
PyrazolepyroxasulfoneFocus
Group 16Unknown
Benzofuranyl alkylsulfonateethofumesateEthos SCNortron
Group 19Auxin transport inhibitor allowing buildup in the meristem area
SemicarbazonediflufenzopyrDistinct
Group 20Inhibits actively dividing merestems in roots and shoots as well as seed germination
NitrilesdichlobenilCasoron
Group 22Cell membrane disrupters.
Chemicals that disrupt the internal cell membrane and prevent the cells from manufacturing food.
BipyridyliumsdiquatMasterline Diquat
Reglone Desiccant
Reglone 240 Desiccant
Reglone Ion
Reward
Stage Desiccant
paraquatGramoxone
Group 27Inhibits plant pigment biosynthesis and photosynthesis
BenzopyrazolepyrasulfotoleAxial iPakInfinityTundraVelocity m3
topramezoneArmezon
* A herbicide may appear in more than one group if it contains more than one active ingredient
 
 
 
 
For more information about the content of this document, contact Harry Brook.
This document is maintained by Mary Ann Nelson.
This information published to the web on April 15, 2003.
Last Reviewed/Revised on March 18, 2016.