International Survey of Herbicide-Resistant Weeds

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


Multiple Resistance: 3 Sites of Action
ALS inhibitors (B/2)
PPO inhibitors (E/14)
EPSP synthase inhibitors (G/9)

United States, Maryland
INTRODUCTION COMMON RAGWEED
Common Ragweed (Ambrosia artemisiifolia) is a dicot weed in the Asteraceae family.  In Maryland this weed first evolved multiple resistance (to 3 herbicide sites of action) in 2016 and infests Soybean.  Multiple resistance has evolved to herbicides in the Groups B/2, E/14, and G/9.  These particular biotypes are known to have resistance to cloransulam-methyl, fomesafen, and glyphosate and they may be cross-resistant to other herbicides in the Groups B/2, E/14, 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 Nov 09, 2017 )

Common NameCommon Ragweed
SpeciesAmbrosia artemisiifolia
GroupALS inhibitors (B/2)
PPO inhibitors (E/14)
EPSP synthase inhibitors (G/9)
Herbicidescloransulam-methyl, fomesafen, and glyphosate
LocationUnited States, Maryland
Year2016
Situation(s)Soybean
Contributors - (Alphabetically)Mark VanGessel 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse, and Laboratory 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, E, G/2, 14, 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 Maryland please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

MARK VANGESSEL
Professor and Extension Specialist
University of Delaware
Department of Plant and Soil Sciences
16684 County Seat Highway
Georgetown, 19947, Delaware
United States
Email Mark VanGessel
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Maryland have been instrumental in providing you this information. Particular thanks is given to Mark VanGessel 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 (Quebec) CanadaQuebec1999 Carrots linuron, and metribuzin 7 Multiple Resistance: 2 Sites of Action
Photosystem II inhibitors (C1/5)
PSII inhibitor (Ureas and amides) (C2/7)
18Ambrosia artemisiifoliaCommon Ragweed17128
4 Canada (Ontario) CanadaOntario2000 Soybean chlorimuron-ethyl, cloransulam-methyl, and imazethapyr 7 ALS inhibitors (B/2)
18Ambrosia artemisiifoliaCommon Ragweed5471
5 Canada (Quebec) CanadaQuebec2007 Soybean cloransulam-methyl, and imazethapyr 7 ALS inhibitors (B/2)
18Ambrosia artemisiifoliaCommon Ragweed17127
6 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
7 United States (Michigan) United StatesMichigan1990 Corn (maize), and Nurseries atrazine 45 Photosystem II inhibitors (C1/5)
18Ambrosia artemisiifoliaCommon Ragweed5181
8 United States (New York) United StatesNew York1993 Corn (maize) atrazine, cyanazine, and simazine 45 Photosystem II inhibitors (C1/5)
18Ambrosia artemisiifoliaCommon Ragweed1057
9 United States (Indiana) United StatesIndiana1998 Soybean cloransulam-methyl, and imazethapyr 45 ALS inhibitors (B/2)
18Ambrosia artemisiifoliaCommon Ragweed1113
10 United States (Illinois) United StatesIllinois1998 Soybean cloransulam-methyl, and imazethapyr 45 ALS inhibitors (B/2)
18Ambrosia artemisiifoliaCommon Ragweed1114
11 United States (Michigan) United StatesMichigan1998 Corn (maize), Nurseries, and Soybean cloransulam-methyl, imazamox, and imazethapyr 45 ALS inhibitors (B/2)
18Ambrosia artemisiifoliaCommon Ragweed1115
12 United States (Minnesota) United StatesMinnesota1998 Soybean cloransulam-methyl, imazethapyr, and primisulfuron-methyl 45 ALS inhibitors (B/2)
18Ambrosia artemisiifoliaCommon Ragweed1116
13 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
14 United States (Missouri) United StatesMissouri2004 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
18Ambrosia artemisiifoliaCommon Ragweed5228
15 United States (Arkansas) United StatesArkansas2004 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
18Ambrosia artemisiifoliaCommon Ragweed5261
16 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
17 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
18 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
19 United States (North Carolina) United StatesNorth Carolina2006 Cotton glyphosate 45 EPSP synthase inhibitors (G/9)
18Ambrosia artemisiifoliaCommon Ragweed7819
20 United States (North Carolina) United StatesNorth Carolina2006 Peanut (groundnut) diclosulam 45 ALS inhibitors (B/2)
18Ambrosia artemisiifoliaCommon Ragweed7857
21 United States (Kentucky) United StatesKentucky2006 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
18Ambrosia artemisiifoliaCommon Ragweed7879
22 United States (Kansas) United StatesKansas2007 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
18Ambrosia artemisiifoliaCommon Ragweed5305
23 United States (North Dakota) United StatesNorth Dakota2007 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
18Ambrosia artemisiifoliaCommon Ragweed5507
24 United States (Indiana) United StatesIndiana2007 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
18Ambrosia artemisiifoliaCommon Ragweed5519
25 United States (South Dakota) United StatesSouth Dakota2007 Corn (maize), and Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
18Ambrosia artemisiifoliaCommon Ragweed5635
26 United States (Minnesota) United StatesMinnesota2008 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
18Ambrosia artemisiifoliaCommon Ragweed5506
27 United States (Pennsylvania) United StatesPennsylvania2008 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
18Ambrosia artemisiifoliaCommon Ragweed7778
28 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
29 United States (Alabama) United StatesAlabama2013 Cotton glyphosate 45 EPSP synthase inhibitors (G/9)
18Ambrosia artemisiifoliaCommon Ragweed7784
30 United States (New Jersey) United StatesNew Jersey2013 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
18Ambrosia artemisiifoliaCommon Ragweed8916
31 United States (Nebraska) United StatesNebraska2013 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
18Ambrosia artemisiifoliaCommon Ragweed8917
32 United States (Wisconsin) United StatesWisconsin2013 Soybean cloransulam-methyl 45 ALS inhibitors (B/2)
18Ambrosia artemisiifoliaCommon Ragweed10981
33 United States (Mississippi) United StatesMississippi2014 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
18Ambrosia artemisiifoliaCommon Ragweed8900
34 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
35 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
36 United States (Maryland) United StatesMaryland2016 Soybean cloransulam-methyl, fomesafen, and glyphosate 45 Multiple Resistance: 3 Sites of Action
ALS inhibitors (B/2)
PPO inhibitors (E/14)
EPSP synthase inhibitors (G/9)
18Ambrosia artemisiifoliaCommon Ragweed17109
37 United States (New Jersey) United StatesNew Jersey2016 Soybean cloransulam-methyl, fomesafen, and glyphosate 45 Multiple Resistance: 3 Sites of Action
ALS inhibitors (B/2)
PPO inhibitors (E/14)
EPSP synthase inhibitors (G/9)
18Ambrosia artemisiifoliaCommon Ragweed17110
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