INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE
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Herbicide Resistant Common Ragweed Globally
(Ambrosia artemisiifolia)
Herbicide Resistant Common Ragweed Globally
(Ambrosia artemisiifolia)
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Herbicide Resistant Common Ragweed Globally
(Ambrosia artemisiifolia)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Canada (Ontario) CanadaOntario1976 Corn (maize), and Cropland atrazine 7 PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
 		18Ambrosia artemisiifoliaCommon Ragweed59
2 Canada (Quebec) CanadaQuebec1999 Carrots linuron 7 PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
 		18Ambrosia artemisiifoliaCommon Ragweed5064
3 Canada (Quebec) CanadaQuebec1999 Carrots linuron, and metribuzin 7 PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
 		18Ambrosia artemisiifoliaCommon Ragweed17128
4 Canada (Ontario) CanadaOntario2000 Soybean chlorimuron-ethyl, cloransulam-methyl, and imazethapyr 7 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		18Ambrosia artemisiifoliaCommon Ragweed5471
5 Canada (Quebec) CanadaQuebec2007 Soybean cloransulam-methyl, and imazethapyr 7 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		18Ambrosia artemisiifoliaCommon Ragweed17127
6 Canada (Ontario) CanadaOntario2012 Soybean chlorimuron-ethyl, cloransulam-methyl, glyphosate, and imazamethabenz-methyl 7 Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
 		18Ambrosia artemisiifoliaCommon Ragweed5713
7 Canada (Prince Edward Island) CanadaPrince Edward Island2023 Carrots linuron 7 PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
 		18Ambrosia artemisiifoliaCommon Ragweed28275
8 FranceFrance 2013 Chickpea, Soybean, and Sunflower imazamox, metsulfuron-methyl, and tribenuron-methyl 17 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		18Ambrosia artemisiifoliaCommon Ragweed21230
9 SerbiaSerbia 2019 Corn (maize), Soybean, Sugar beets, and Sunflower imazamox, thiencarbazone-methyl, and tribenuron-methyl 245 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		18Ambrosia artemisiifoliaCommon Ragweed20224
10 UkraineUkraine 2023 Sunflower amidosulfuron, carfentrazone-ethyl, flazasulfuron, flumetsulam, foramsulfuron, imazamox, imazapyr, iodosulfuron-methyl-Na, nicosulfuron, and thiencarbazone-methyl 230 Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Inhibition of Protoporphyrinogen Oxidase HRAC Group 14 (Legacy E)
 		18Ambrosia artemisiifoliaCommon Ragweed26266
11 United States (Michigan) United StatesMichigan1990 Corn (maize), and Nurseries atrazine 45 PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
 		18Ambrosia artemisiifoliaCommon Ragweed5181
12 United States (New York) United StatesNew York1993 Corn (maize) atrazine, cyanazine, and simazine 45 PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
 		18Ambrosia artemisiifoliaCommon Ragweed1057
13 United States (Indiana) United StatesIndiana1998 Soybean cloransulam-methyl, and imazethapyr 45 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		18Ambrosia artemisiifoliaCommon Ragweed1113
14 United States (Illinois) United StatesIllinois1998 Soybean cloransulam-methyl, and imazethapyr 45 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		18Ambrosia artemisiifoliaCommon Ragweed1114
15 United States (Michigan) United StatesMichigan1998 Corn (maize), Nurseries, and Soybean cloransulam-methyl, imazamox, and imazethapyr 45 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		18Ambrosia artemisiifoliaCommon Ragweed1115
16 United States (Minnesota) United StatesMinnesota1998 Soybean cloransulam-methyl, imazethapyr, and primisulfuron-methyl 45 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		18Ambrosia artemisiifoliaCommon Ragweed1116
17 United States (Ohio) United StatesOhio1998 Soybean chlorimuron-ethyl, cloransulam-methyl, halosulfuron-methyl, imazamox, imazaquin, primisulfuron-methyl, and prosulfuron 45 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		18Ambrosia artemisiifoliaCommon Ragweed1117
18 United States (Missouri) United StatesMissouri2004 Soybean glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
 		18Ambrosia artemisiifoliaCommon Ragweed5228
19 United States (Arkansas) United StatesArkansas2004 Soybean glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
 		18Ambrosia artemisiifoliaCommon Ragweed5261
20 United States (Delaware) United StatesDelaware2005 Soybean acifluorfen, carfentrazone-ethyl, chlorimuron-ethyl, cloransulam-methyl, flumiclorac-pentyl, flumioxazin, fomesafen, halosulfuron-methyl, imazamox, imazapyr, imazaquin, imazethapyr, iodosulfuron-methyl-Na, lactofen, metsulfuron-methyl, oxyfluorfen, primisulfuron-methyl, pyraflufen-ethyl, pyrithiobac-sodium, sulfentrazone, and trifloxysulfuron-Na 45 Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Inhibition of Protoporphyrinogen Oxidase HRAC Group 14 (Legacy E)
 		18Ambrosia artemisiifoliaCommon Ragweed5265
21 United States (Ohio) United StatesOhio2006 Soybean chlorimuron-ethyl, cloransulam-methyl, and glyphosate 45 Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
 		18Ambrosia artemisiifoliaCommon Ragweed5406
22 United States (Ohio) United StatesOhio2006 Soybean chlorimuron-ethyl, cloransulam-methyl, fomesafen, and lactofen 45 Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Inhibition of Protoporphyrinogen Oxidase HRAC Group 14 (Legacy E)
 		18Ambrosia artemisiifoliaCommon Ragweed5407
23 United States (North Carolina) United StatesNorth Carolina2006 Cotton glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
 		18Ambrosia artemisiifoliaCommon Ragweed7819
24 United States (North Carolina) United StatesNorth Carolina2006 Peanut (groundnut) diclosulam 45 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		18Ambrosia artemisiifoliaCommon Ragweed7857
25 United States (Kentucky) United StatesKentucky2006 Soybean glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
 		18Ambrosia artemisiifoliaCommon Ragweed7879
26 United States (Kansas) United StatesKansas2007 Soybean glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
 		18Ambrosia artemisiifoliaCommon Ragweed5305
27 United States (North Dakota) United StatesNorth Dakota2007 Soybean glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
 		18Ambrosia artemisiifoliaCommon Ragweed5507
28 United States (Indiana) United StatesIndiana2007 Soybean glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
 		18Ambrosia artemisiifoliaCommon Ragweed5519
29 United States (South Dakota) United StatesSouth Dakota2007 Corn (maize), and Soybean glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
 		18Ambrosia artemisiifoliaCommon Ragweed5635
30 United States (Minnesota) United StatesMinnesota2008 Soybean glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
 		18Ambrosia artemisiifoliaCommon Ragweed5506
31 United States (Pennsylvania) United StatesPennsylvania2008 Soybean glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
 		18Ambrosia artemisiifoliaCommon Ragweed7778
32 United States (Minnesota) United StatesMinnesota2010 Soybean cloransulam-methyl, glyphosate, and imazapyr 45 Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
 		18Ambrosia artemisiifoliaCommon Ragweed7801
33 United States (Alabama) United StatesAlabama2013 Cotton glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
 		18Ambrosia artemisiifoliaCommon Ragweed7784
34 United States (New Jersey) United StatesNew Jersey2013 Soybean glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
 		18Ambrosia artemisiifoliaCommon Ragweed8916
35 United States (Nebraska) United StatesNebraska2013 Soybean glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
 		18Ambrosia artemisiifoliaCommon Ragweed8917
36 United States (Wisconsin) United StatesWisconsin2013 Soybean cloransulam-methyl 45 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		18Ambrosia artemisiifoliaCommon Ragweed10981
37 United States (Mississippi) United StatesMississippi2014 Soybean glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
 		18Ambrosia artemisiifoliaCommon Ragweed8900
38 United States (North Carolina) United StatesNorth Carolina2015 Corn (maize), and Soybean acifluorfen, cloransulam-methyl, fomesafen, glyphosate, lactofen, and nicosulfuron 45 Multiple Resistance: 3 Sites of Action
Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Inhibition of Protoporphyrinogen Oxidase HRAC Group 14 (Legacy E)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
 		18Ambrosia artemisiifoliaCommon Ragweed13036
39 United States (Michigan) United StatesMichigan2016 Soybean cloransulam-methyl, and fomesafen 45 Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Inhibition of Protoporphyrinogen Oxidase HRAC Group 14 (Legacy E)
 		18Ambrosia artemisiifoliaCommon Ragweed17106
40 United States (Maryland) United StatesMaryland2016 Soybean cloransulam-methyl, fomesafen, and glyphosate 45 Multiple Resistance: 3 Sites of Action
Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Inhibition of Protoporphyrinogen Oxidase HRAC Group 14 (Legacy E)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
 		18Ambrosia artemisiifoliaCommon Ragweed17109
41 United States (New Jersey) United StatesNew Jersey2016 Soybean cloransulam-methyl, fomesafen, and glyphosate 45 Multiple Resistance: 3 Sites of Action
Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Inhibition of Protoporphyrinogen Oxidase HRAC Group 14 (Legacy E)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
 		18Ambrosia artemisiifoliaCommon Ragweed17110
42 United States (Wisconsin) United StatesWisconsin2017 Corn (maize), and Soybean glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
 		18Ambrosia artemisiifoliaCommon Ragweed17155
43 United States (Michigan) United StatesMichigan2022 Christmas Trees clopyralid 45 Auxin Mimics HRAC Group 4 (Legacy O)
 		18Ambrosia artemisiifoliaCommon Ragweed27277
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