INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE
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Herbicide Resistant Blackgrass Globally
(Alopecurus myosuroides)
Herbicide Resistant Blackgrass Globally
(Alopecurus myosuroides)
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Herbicide Resistant Blackgrass Globally
(Alopecurus myosuroides)
#CountryFirstYearSituationActive IngredientsSite of Action
1 BelgiumBelgium 1996 Winter wheat clodinafop-propargyl, and fenoxaprop-ethyl 3 Inhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)
 		6Alopecurus myosuroidesBlackgrass501
2 BelgiumBelgium 1996 Wheat isoproturon 3 PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
 		6Alopecurus myosuroidesBlackgrass502
3 BelgiumBelgium 1996 Winter wheat atrazine, chlorotoluron, clodinafop-propargyl, fenoxaprop-ethyl, flupyrsulfuron-methyl-Na, pendimethalin, and propaquizafop 3 Multiple Resistance: 4 Sites of Action
Inhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)
Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
Inhibition of Microtubule AssemblyHRAC Group 3 (Legacy K1)
 		6Alopecurus myosuroidesBlackgrass5043
4 Czech RepublicCzech Republic 2008 Wheat chlorsulfuron 12 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		6Alopecurus myosuroidesBlackgrass7871
5 DenmarkDenmark 2001 Winter wheat fenoxaprop-ethyl 13 Inhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)
 		6Alopecurus myosuroidesBlackgrass5347
6 DenmarkDenmark 2001 Winter wheat clodinafop-propargyl, cycloxydim, fenoxaprop-ethyl, florasulam, flupyrsulfuron-methyl-Na, iodosulfuron-methyl-Na, mesosulfuron-methyl, pendimethalin, and pyroxsulam 13 Multiple Resistance: 3 Sites of Action
Inhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)
Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Inhibition of Microtubule AssemblyHRAC Group 3 (Legacy K1)
 		6Alopecurus myosuroidesBlackgrass5675
7 FranceFrance 1993 Wheat clodinafop-propargyl, cycloxydim, diclofop-methyl, fenoxaprop-ethyl, haloxyfop-methyl, and sethoxydim 17 Inhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)
 		6Alopecurus myosuroidesBlackgrass546
8 FranceFrance 2003 Wheat clodinafop-propargyl, diclofop-methyl, fenoxaprop-ethyl, iodosulfuron-methyl-Na, mesosulfuron-methyl, and sethoxydim 17 Multiple Resistance: 2 Sites of Action
Inhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)
Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		6Alopecurus myosuroidesBlackgrass17116
9 FranceFrance 2006 Wheat imazamethabenz-methyl, iodosulfuron-methyl-Na, and mesosulfuron-methyl 17 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		6Alopecurus myosuroidesBlackgrass5329
10 FranceFrance 2020 Cereals, and Rapeseed flufenacet, and prosulfocarb 17 Very Long-Chain Fatty Acid Synthesis inhibitorsHRAC Group 15 (Legacy K3 N)
 		6Alopecurus myosuroidesBlackgrass29267
11 FranceFrance 2022 Wheat glyphosate 17 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
 		6Alopecurus myosuroidesBlackgrass29265
12 GermanyGermany 1983 Sugar beets, and Wheat chlorotoluron, fenoxaprop-ethyl, and isoproturon 18 Multiple Resistance: 2 Sites of Action
Inhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)
PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
 		6Alopecurus myosuroidesBlackgrass369
13 GermanyGermany 2001 Wheat flupyrsulfuron-methyl-Na 18 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		6Alopecurus myosuroidesBlackgrass5154
14 GermanyGermany 2003 Sugar beets, and Winter wheat clethodim, cycloxydim, fenoxaprop-ethyl, and fluazifop-butyl 18 Inhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)
 		6Alopecurus myosuroidesBlackgrass5237
15 GermanyGermany 2007 Wheat chlorotoluron, fenoxaprop-ethyl, flufenacet, isoproturon, mesosulfuron-methyl, and pinoxaden 18 Multiple Resistance: 4 Sites of Action
Inhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)
Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
Very Long-Chain Fatty Acid Synthesis inhibitorsHRAC Group 15 (Legacy K3 N)
 		6Alopecurus myosuroidesBlackgrass5361
16 GermanyGermany 2009 Cereals cycloxydim, fenoxaprop-ethyl, flupyrsulfuron-methyl-Na, mesosulfuron-methyl, and pinoxaden 18 Multiple Resistance: 2 Sites of Action
Inhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)
Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		6Alopecurus myosuroidesBlackgrass5536
17 IrelandIreland 2021 Wheat cycloxydim, iodosulfuron-methyl-Na, mesosulfuron-methyl, and propaquizafop 81 Multiple Resistance: 2 Sites of Action
Inhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)
Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		6Alopecurus myosuroidesBlackgrass21236
18 IsraelIsrael 1979 Roadsides methabenzthiazuron 23 PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
 		6Alopecurus myosuroidesBlackgrass94
19 ItalyItaly 2009 Durum wheat clodinafop-propargyl, fenoxaprop-ethyl, and pinoxaden 24 Inhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)
 		6Alopecurus myosuroidesBlackgrass5681
20 NetherlandsNetherlands 1989 Wheat chlorotoluron 43 PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
 		6Alopecurus myosuroidesBlackgrass221
21 NetherlandsNetherlands 1996 Winter wheat chlorotoluron, clodinafop-propargyl, fenoxaprop-ethyl, and isoproturon 43 Multiple Resistance: 2 Sites of Action
Inhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)
PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
 		6Alopecurus myosuroidesBlackgrass5082
22 NetherlandsNetherlands 1999 Winter wheat clodinafop-propargyl, cycloxydim, fenoxaprop-ethyl, and penoxsulam 43 Multiple Resistance: 2 Sites of Action
Inhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)
Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		6Alopecurus myosuroidesBlackgrass5083
23 NetherlandsNetherlands 2010 Winter wheat florasulam, iodosulfuron-methyl-Na, mesosulfuron-methyl, and pyroxsulam 43 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		6Alopecurus myosuroidesBlackgrass10978
24 New ZealandNew Zealand 2024 Flax, and Wheat iodosulfuron-methyl-Na, and mesosulfuron-methyl 30 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		6Alopecurus myosuroidesBlackgrass37288
25 PolandPoland 2010 Winter wheat iodosulfuron-methyl-Na, and mesosulfuron-methyl 33 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		6Alopecurus myosuroidesBlackgrass5620
26 PolandPoland 2011 Winter wheat fenoxaprop-ethyl, and pinoxaden 33 Inhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)
 		6Alopecurus myosuroidesBlackgrass6760
27 PolandPoland 2012 Winter wheat fenoxaprop-ethyl, iodosulfuron-methyl-Na, mesosulfuron-methyl, pinoxaden, and sulfometuron-methyl 33 Multiple Resistance: 2 Sites of Action
Inhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)
Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		6Alopecurus myosuroidesBlackgrass10969
28 SpainSpain 1991 Wheat chlorotoluron 38 PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
 		6Alopecurus myosuroidesBlackgrass188
29 SpainSpain 2015 Canola, Faba beans, Peas, Wheat, and Winter barley chlorotoluron, clodinafop-propargyl, cloransulam-methyl, iodosulfuron-methyl-Na, isoproturon, mesosulfuron-methyl, and pinoxaden 38 Multiple Resistance: 3 Sites of Action
Inhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)
Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
 		6Alopecurus myosuroidesBlackgrass11014
30 SwedenSweden 2011 Winter wheat clodinafop-propargyl, cycloxydim, and fenoxaprop-ethyl 40 Inhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)
 		6Alopecurus myosuroidesBlackgrass8911
31 SwedenSweden 2011 Wheat fenoxaprop-ethyl, flupyrsulfuron-methyl-Na, prosulfocarb, and pyroxsulam 40 Multiple Resistance: 3 Sites of Action
Inhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)
Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Very Long-Chain Fatty Acid Synthesis inhibitorsHRAC Group 15 (Legacy K3 N)
 		6Alopecurus myosuroidesBlackgrass8912
32 SwedenSweden 2014 Spring wheat, Winter barley, and Winter wheat cycloxydim, fenoxaprop-ethyl, flupyrsulfuron-methyl-Na, iodosulfuron-methyl-Na, mesosulfuron-methyl, and pyroxsulam 40 Multiple Resistance: 2 Sites of Action
Inhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)
Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		6Alopecurus myosuroidesBlackgrass10995
33 SwitzerlandSwitzerland 1997 Wheat, and Winter barley chlorotoluron, and isoproturon 41 PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
 		6Alopecurus myosuroidesBlackgrass1132
34 SwitzerlandSwitzerland 2019 Wheat, and Winter barley chlorotoluron, iodosulfuron-methyl-Na, mesosulfuron-methyl, and quizalofop-ethyl 41 Multiple Resistance: 3 Sites of Action
Inhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)
Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
 		6Alopecurus myosuroidesBlackgrass20228
35 TurkeyTurkey 2001 Wheat clodinafop-propargyl 71 Inhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)
 		6Alopecurus myosuroidesBlackgrass5116
36 TurkeyTurkey 2008 clodinafop-propargyl, and pyroxsulam 71 Multiple Resistance: 2 Sites of Action
Inhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)
Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		6Alopecurus myosuroidesBlackgrass5403
37 United KingdomUnited Kingdom 1982 Canola, Cereals, and Wheat clethodim, clodinafop-propargyl, cycloxydim, diclofop-methyl, fenoxaprop-ethyl, fluazifop-butyl, pinoxaden, quizalofop-ethyl, and sethoxydim 44 Inhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)
 		6Alopecurus myosuroidesBlackgrass357
38 United KingdomUnited Kingdom 1982 Cereals chlorotoluron, and isoproturon 44 PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
 		6Alopecurus myosuroidesBlackgrass507
39 United KingdomUnited Kingdom 1984 Wheat chlorsulfuron, flupyrsulfuron-methyl-Na, imazamethabenz-methyl, iodosulfuron-methyl-Na, mesosulfuron-methyl, propoxycarbazone-Na, and pyroxsulam 44 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		6Alopecurus myosuroidesBlackgrass323
40 United KingdomUnited Kingdom 1987 Wheat pendimethalin 44 Inhibition of Microtubule AssemblyHRAC Group 3 (Legacy K1)
 		6Alopecurus myosuroidesBlackgrass329
HRAC Global Heap, I.  The International Herbicide-Resistant Weed Database.  Online.  Saturday, September 26, 2026.  Available at  www.weedscience.org

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