International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
MULTIPLE RESISTANT COMMON RAGWEED
(Ambrosia artemisiifolia)


Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)

Canada, Ontario
INTRODUCTION COMMON RAGWEED
Common Ragweed (Ambrosia artemisiifolia) is a dicot weed in the Asteraceae family.  In Ontario this weed first evolved multiple resistance (to 2 herbicide sites of action) in 2012 and infests Soybean.  Multiple resistance has evolved to herbicides in the Groups B/2, and G/9.  These particular biotypes are known to have resistance to chlorimuron-ethyl, cloransulam-methyl, glyphosate, and imazamethabenz-methyl and they may be cross-resistant to other herbicides in the Groups B/2, and G/9.

The 'Group' letters/numbers that you see throughout this web site refer to the classification of herbicides by their site of action. To see a full list of herbicides and HRAC herbicide classifications click here.

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QUIK STATS (last updated Jul 16, 2013 )

Common NameCommon Ragweed
SpeciesAmbrosia artemisiifolia
GroupALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
Herbicideschlorimuron-ethyl, cloransulam-methyl, glyphosate, and imazamethabenz-methyl
LocationCanada, Ontario
Year2012
Situation(s)Soybean
Contributors - (Alphabetically)Francois Tardif 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Common Ragweed biotype with this Common Ragweed biotype have been used to confirm resistance. For further information on the tests conducted please contact the local weed scientists that provided this information.
 
Genetics

Genetic studies on Group B, G/2, 9 resistant Common Ragweed have not been reported to the site.  There may be a note below or an article discussing the genetics of this biotype in the Fact Sheets and Other Literature
 
Mechanism of Resistance

The mechanism of resistance for this biotype is either unknown or has not been entered in the database.  If you know anything about the mechanism of resistance for this biotype then please update the database.
 
Relative Fitness

There is no record of differences in fitness or competitiveness of these resistant biotypes when compared to that of normal susceptible biotypes.  If you have any information pertaining to the fitness of multiple resistant Common Ragweed from Ontario please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

FRANCOIS TARDIF
Associate Professor
University Of Guelph
Department Of Plant Agriculture
2055 Radatz Ave
Guelph, N1G 2W1, Ontario
Canada
Email Francois Tardif
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Ontario have been instrumental in providing you this information. Particular thanks is given to Francois Tardif for providing detailed information.
Herbicide Resistant Common Ragweed Globally
(Ambrosia artemisiifolia)
Herbicide Resistant Common Ragweed Globally
(Ambrosia artemisiifolia)
Drag a column header and drop it here to group by that column
Herbicide Resistant Common Ragweed Globally
(Ambrosia artemisiifolia)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Canada (Ontario) CanadaOntario1976 Corn (maize), and Cropland atrazine 7 Photosystem II inhibitors (C1/5)
18Ambrosia artemisiifoliaCommon Ragweed59
2 Canada (Quebec) CanadaQuebec1999 Carrots linuron 7 PSII inhibitor (Ureas and amides) (C2/7)
18Ambrosia artemisiifoliaCommon Ragweed5064
3 Canada (Ontario) CanadaOntario2000 Soybean chlorimuron-ethyl, cloransulam-methyl, and imazethapyr 7 ALS inhibitors (B/2)
18Ambrosia artemisiifoliaCommon Ragweed5471
4 Canada (Ontario) CanadaOntario2012 Soybean chlorimuron-ethyl, cloransulam-methyl, glyphosate, and imazamethabenz-methyl 7 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
18Ambrosia artemisiifoliaCommon Ragweed5713
5 United States (Michigan) United StatesMichigan1990 Corn (maize), and Nurseries atrazine 45 Photosystem II inhibitors (C1/5)
18Ambrosia artemisiifoliaCommon Ragweed5181
6 United States (New York) United StatesNew York1993 Corn (maize) atrazine, cyanazine, and simazine 45 Photosystem II inhibitors (C1/5)
18Ambrosia artemisiifoliaCommon Ragweed1057
7 United States (Indiana) United StatesIndiana1998 Soybean cloransulam-methyl, and imazethapyr 45 ALS inhibitors (B/2)
18Ambrosia artemisiifoliaCommon Ragweed1113
8 United States (Illinois) United StatesIllinois1998 Soybean cloransulam-methyl, and imazethapyr 45 ALS inhibitors (B/2)
18Ambrosia artemisiifoliaCommon Ragweed1114
9 United States (Michigan) United StatesMichigan1998 Corn (maize), Nurseries, and Soybean cloransulam-methyl, imazamox, and imazethapyr 45 ALS inhibitors (B/2)
18Ambrosia artemisiifoliaCommon Ragweed1115
10 United States (Minnesota) United StatesMinnesota1998 Soybean cloransulam-methyl, imazethapyr, and primisulfuron-methyl 45 ALS inhibitors (B/2)
18Ambrosia artemisiifoliaCommon Ragweed1116
11 United States (Ohio) United StatesOhio1998 Soybean chlorimuron-ethyl, cloransulam-methyl, halosulfuron-methyl, imazamox, imazaquin, primisulfuron-methyl, and prosulfuron 45 ALS inhibitors (B/2)
18Ambrosia artemisiifoliaCommon Ragweed1117
12 United States (Missouri) United StatesMissouri2004 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
18Ambrosia artemisiifoliaCommon Ragweed5228
13 United States (Arkansas) United StatesArkansas2004 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
18Ambrosia artemisiifoliaCommon Ragweed5261
14 United States (Delaware) United StatesDelaware2005 Soybean acifluorfen-sodium, carfentrazone-ethyl, chlorimuron-ethyl, cloransulam-methyl, flumiclorac-pentyl, flumioxazin, fomesafen, halosulfuron-methyl, imazamox, imazapyr, imazaquin, imazethapyr, iodosulfuron-methyl-sodium, lactofen, metsulfuron-methyl, oxyfluorfen, primisulfuron-methyl, pyraflufen-ethyl, pyrithiobac-sodium, sulfentrazone, and trifloxysulfuron-sodium 45 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
PPO inhibitors (E/14)
18Ambrosia artemisiifoliaCommon Ragweed5265
15 United States (Ohio) United StatesOhio2006 Soybean chlorimuron-ethyl, cloransulam-methyl, and glyphosate 45 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
18Ambrosia artemisiifoliaCommon Ragweed5406
16 United States (Ohio) United StatesOhio2006 Soybean chlorimuron-ethyl, cloransulam-methyl, fomesafen, and lactofen 45 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
PPO inhibitors (E/14)
18Ambrosia artemisiifoliaCommon Ragweed5407
17 United States (North Carolina) United StatesNorth Carolina2006 Cotton glyphosate 45 EPSP synthase inhibitors (G/9)
18Ambrosia artemisiifoliaCommon Ragweed7819
18 United States (North Carolina) United StatesNorth Carolina2006 Peanut (groundnut) diclosulam 45 ALS inhibitors (B/2)
18Ambrosia artemisiifoliaCommon Ragweed7857
19 United States (Kentucky) United StatesKentucky2006 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
18Ambrosia artemisiifoliaCommon Ragweed7879
20 United States (Kansas) United StatesKansas2007 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
18Ambrosia artemisiifoliaCommon Ragweed5305
21 United States (North Dakota) United StatesNorth Dakota2007 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
18Ambrosia artemisiifoliaCommon Ragweed5507
22 United States (Indiana) United StatesIndiana2007 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
18Ambrosia artemisiifoliaCommon Ragweed5519
23 United States (South Dakota) United StatesSouth Dakota2007 Corn (maize), and Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
18Ambrosia artemisiifoliaCommon Ragweed5635
24 United States (Minnesota) United StatesMinnesota2008 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
18Ambrosia artemisiifoliaCommon Ragweed5506
25 United States (Pennsylvania) United StatesPennsylvania2008 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
18Ambrosia artemisiifoliaCommon Ragweed7778
26 United States (Minnesota) United StatesMinnesota2010 Soybean cloransulam-methyl, glyphosate, and imazapyr 45 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
18Ambrosia artemisiifoliaCommon Ragweed7801
27 United States (Alabama) United StatesAlabama2013 Cotton glyphosate 45 EPSP synthase inhibitors (G/9)
18Ambrosia artemisiifoliaCommon Ragweed7784
28 United States (New Jersey) United StatesNew Jersey2013 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
18Ambrosia artemisiifoliaCommon Ragweed8916
29 United States (Nebraska) United StatesNebraska2013 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
18Ambrosia artemisiifoliaCommon Ragweed8917
30 United States (Wisconsin) United StatesWisconsin2013 Soybean cloransulam-methyl 45 ALS inhibitors (B/2)
18Ambrosia artemisiifoliaCommon Ragweed10981
31 United States (Mississippi) United StatesMississippi2014 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
18Ambrosia artemisiifoliaCommon Ragweed8900
32 United States (North Carolina) United StatesNorth Carolina2015 Corn (maize), and Soybean acifluorfen-sodium, cloransulam-methyl, fomesafen, glyphosate, lactofen, and nicosulfuron 45 Multiple Resistance: 3 Sites of Action
ALS inhibitors (B/2)
PPO inhibitors (E/14)
EPSP synthase inhibitors (G/9)
18Ambrosia artemisiifoliaCommon Ragweed13036
33 United States (Michigan) United StatesMichigan2016 Soybean cloransulam-methyl, and fomesafen 45 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
PPO inhibitors (E/14)
18Ambrosia artemisiifoliaCommon Ragweed17106
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