The 2025 Australian turf herbicide resistance chart shows herbicide mode of action (MOA) groups. This includes the sulfonylureas, and pre emergent herbicides. The new chart now includes Pylex and Poacure which are two recent additions to the weed control arsenal.
You can use this free herbicide resistance chart along with our other free management tools for turf managers.
Turf fungicide resistance chart.
Turf insecticide resistance Chart.
Weed ID chart and
The free Guide to turf chemicals.
This herbicide chart also shows herbicide sites of action to better help turf managers delay the development of resistance.
About Gilba Solutions
Gilba Solutions Pty Ltd are Sydney based independent sports turf consultants and turfgrass agronomists. We operate in Sydney, NSW, and the ACT.
Jerry Spencer has written over 100 articles & a book on turf nutrition. These are on topics ranging from turf fertilisers & aquatic weed management to using turf pigments & why turf herbicides sometimes don’t work. He also publishes a turf blog.
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TURF HERBICIDE RESISTANCE CHART
Repeated use of herbicides with the same
site of action can result in the development of herbicide-resistant weed populations.
Premix Trade Name
Active Ingredients
Site of Action
Group
3-D
Bentazone
Dicamba
MCPA
6
4
4
Weed Blast MA
Bromoxynil
MCPA
6
4
Casper
Dicamba
Prosulfuron
4
2
Crest
Florasulam
Fluroxypyr
2
4
Freehand
Dimethenamid
Pendimethalin
15
3
Silverado
Carfentrazone
MCPA
14
4
Warhead Trio
Diflufenican
Clopyralid
MCPA
12
4
4
The chart below lists turf registered premix herbicides by their
trade names so you can identify the component herbicides and
their respective site of action groups. Refer to the Site of Action
Chart on the Left for more information.
There are several means of delaying and perhaps preventing
resistance developing.
The most practical and effective strategy is to rotate herbicides with
different sites of action (SOA). The Table opposite provides
a complete list of herbicides that are registered in Australia for turf
grass and their respective SOA and Group number.
If two herbicides have the same SOA number or code, they affect
weeds in the same way. Consequently repeated and frequent use
of chemicals with the same SOA increases the risk of weeds
becoming resistant.
In contrast rotating or combining herbicides with different SO As
delays the development of resistant weeds.
Pre-emergent herbicides
In turf most pre-emergent herbicides are in Group 3 or 15 but in
reality most Australian turf managers base their programs on
Groups 3 and use Group 2 for post emergent control.
This has increasingly lead to many turf managers increasingly
getting poor results from using Group 2. To ensure that turf
managers can continue to use these for a long time, herbicides
with different SOAs should be incorporated into weed management
programs even if they are not as effective or require repeat
applications to provide the desired level of control. You can then
return to using Groups 3 and 2.
This chart groups herbicides by their sites of action 1) to maintain greater diversity in herbicide use and 2) to
rotate among herbicides with different sites of action to delay the development of herbicide resistance. The
Site of Action (SOA) Group is a classification system developed by the Weed Society of America.
Lipid
Synthesis
Inhibitors
1
Group
Chemical Family
Active Ingredient
Product Examples
2
9
4
6
5
12
10
18
29
14
22
3
15
27
Amino
Acid
Synthesis
Inhibitors
Photosyntheis
Inhibitors
Growth
Regulators
Cell
Membrane
Disruptors
Seedling Root
Growth
Inhibitors
Carotenoid
Inhibitors
Nitrogen
metabolism
Auxin
Inhibitor
Cellulose
Inhibitors
Seedling
Shoot
Growth
Inhibitors
HPPD
Inhibitor
ACCase
Inhibitors
Site of Action
ALS Inhibitors
PPO Inhibitors
Inhibitors of
cellulose
biosynthesis
DHP Inhibitors
Glutamine
synthesis
Inhibitor
Inhibitors of
carotenoid
biosynthesis
EPSP Synthase
Inhibitor
Specific Site
Unknown
Photosystem II
Inhibitor
Photosystem II
Inhibitor
Photosystem I
Diverters
Microtubule
Inhibitors
Long Chain Fatty
Acid Inhibitor
HPPD inhibitor
Aryloxyphenoxy
propionate
Sulfonylureas
Pyrimidinyl-thio-
benzoate
Triazoloyrimidine
Phenoxy
Benzoate
Pyridine
Quinoline carboxylate
Glycine
Carbamates
Phosphinic acid
Phenyl ether
Nitrile
Benzothiadiazinone
Triazine
Triazinone
N-phenyl-oxadiazolones
N-Phenyl triazolinone
Pyridinium
Dinitroaniline
Benzamide
Pyridines
Chloroacetamide
Benzofuran
Pyrazoles
Alkylazines
Diclofop-methyl
Fluazifop
Foramsulfuron
Halosulfuron
Iodosulfuron
Prosulfuron
Rimsulfuron
Trifloxysulfuron
Destro
Fusilade
Tribute
HaloForce
Duke
Casper
Coliseum
Recondo
Bispyribac
Florasulam
Nominee
Crest
Glyphosate
Rapid Fire 800
2,4-D
MCPA
Dicamba
Clopyralid
Picloram
Fluroxypyr
Quinclorac
Simazine
Metribuzin
Bromoxynil
Bentazone
2,4-D
Contra M
Dicamba
Slinger
Victory
Crest
Quinstar
Sim-Force
Metric
Buctril
Nutmeg
Glufosinate
Exonerate
Asulam
Asulox
Indaziflam
Specticle
Diflufenican
Warhead Trio
Oxadiazon
Carfentrazone
Echelon Duo
Smackdown
Paraquat
Paraquat
Pendimethalin
Prodiamine
Battalia
Onset 10GR
Propyzamide
Checkpoint
Dithiopyr
Dimension
Metolachlor
Dimethenamid
Ethofumesate
Topramezone
Pylex
21 Thompson Street
Bowral
NSW 2576
jerry@gilbasolutions.com
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Pennmag
Freehand
Tramat
Inhibition of
fatty acid
thioesterase
30
Inhibits plant cell
wall biosynthesis.
Benzyl ether
Methiozolin
Poacure