International Survey of Herbicide-Resistant Weeds

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GROUP G/9 RESISTANT COMMON RAGWEED
(Ambrosia artemisiifolia)


EPSP synthase inhibitors (G/9)

United States, Mississippi
INTRODUCTION COMMON RAGWEED
Common Ragweed (Ambrosia artemisiifolia) is a dicot weed in the Asteraceae family.  In Mississippi this weed first evolved resistance to Group G/9 herbicides in 2014 and infests Soybean.   Group G/9 herbicides are known as EPSP synthase inhibitors (Inhibition of EPSP synthase).  Research has shown that these particular biotypes are resistant to glyphosate and they may be cross-resistant to other Group G/9 herbicides.

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 Apr 29, 2014 )

Common NameCommon Ragweed
SpeciesAmbrosia artemisiifolia
GroupEPSP synthase inhibitors (G/9)
Herbicidesglyphosate
LocationUnited States, Mississippi
Year2014
Situation(s)Soybean
Contributors - (Alphabetically)Jason Bond, Thomas Eubank, and Vijay Nandula 
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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 G/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 Group G/9 resistant Common Ragweed from Mississippi please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

JASON BOND
Associate Research Professor
Mississippi State University
Delta Research And Extension Center
82 Stoneville Road
Stoneville, 38776, Mississippi
United States
Email Jason Bond
Web   : Web Site Link
THOMAS EUBANK
Assistant Research/Extension Professor
Mississippi State University
Weed Science
P.O. Box 197
Stoneville, 38766, Mississippi
United States
Email Thomas Eubank
Web   : Web Site Link
VIJAY NANDULA
Research Plant Physiologist
USDA-ARS
Crop Production Systems Research Unit
141 Experiment Station Road
Stoneville, 38776, Mississippi
United States
Email Vijay Nandula
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Mississippi have been instrumental in providing you this information. Particular thanks is given to Jason Bond, Thomas Eubank, and Vijay Nandula 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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