International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP G/9 RESISTANT KOCHIA
(Kochia scoparia)


EPSP synthase inhibitors (G/9)

United States, Montana
INTRODUCTION KOCHIA
Kochia (Kochia scoparia) is a dicot weed in the Chenopodiaceae family.  In Montana this weed first evolved resistance to Group G/9 herbicides in 2012 and infests Cereals.   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 Mar 28, 2017 )

Common NameKochia
SpeciesKochia scoparia
GroupEPSP synthase inhibitors (G/9)
Herbicidesglyphosate
LocationUnited States, Montana
Year2012
Situation(s)Cereals
Contributors - (Alphabetically)Prashant Jha 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Kochia biotype with this Kochia 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 Kochia 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 Kochia from Montana please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

PRASHANT JHA
Associate Professor-Weed Science
Montana State University-Bozeman
Southern Agricultural Research Center
748 Railroad Highway
Huntley, 59037, Montana
United States
Email Prashant Jha
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Montana have been instrumental in providing you this information. Particular thanks is given to Prashant Jha for providing detailed information.
Herbicide Resistant Kochia Globally
(Kochia scoparia)
Herbicide Resistant Kochia Globally
(Kochia scoparia)
Drag a column header and drop it here to group by that column
Herbicide Resistant Kochia Globally
(Kochia scoparia)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Canada (Manitoba) CanadaManitoba1988 Industrial sites, Spring Barley, and Wheat chlorsulfuron, imazethapyr, metsulfuron-methyl, thifensulfuron-methyl, triasulfuron, and tribenuron-methyl 7 ALS inhibitors (B/2)
101Kochia scopariaKochia57
2 Canada (Saskatchewan) CanadaSaskatchewan1988 Cropland, and Wheat thifensulfuron-methyl, and tribenuron-methyl 7 ALS inhibitors (B/2)
101Kochia scopariaKochia5069
3 Canada (Alberta) CanadaAlberta1989 Spring Barley, and Wheat chlorsulfuron, metsulfuron-methyl, thifensulfuron-methyl, and tribenuron-methyl 7 ALS inhibitors (B/2)
101Kochia scopariaKochia65
4 Canada (Alberta) CanadaAlberta2012 Spring Barley, and Wheat glyphosate, thifensulfuron-methyl, and tribenuron-methyl 7 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
101Kochia scopariaKochia5592
5 Canada (Saskatchewan) CanadaSaskatchewan2012 Canola, Spring Barley, and Wheat glyphosate, thifensulfuron-methyl, and tribenuron-methyl 7 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
101Kochia scopariaKochia7834
6 Canada (Manitoba) CanadaManitoba2014 Corn (maize), and Soybean glyphosate, thifensulfuron-methyl, and tribenuron-methyl 7 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
101Kochia scopariaKochia9942
7 Canada (Saskatchewan) CanadaSaskatchewan2015 Spring wheat dicamba, fluroxypyr, thifensulfuron-methyl, and tribenuron-methyl 7 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Synthetic Auxins (O/4)
101Kochia scopariaKochia11032
8 Czech RepublicCzech Republic 1996 Railways, and Roadsides atrazine, chlorsulfuron, imazapyr, metsulfuron-methyl, nicosulfuron, prosulfuron, rimsulfuron, sulfosulfuron, thifensulfuron-methyl, tribenuron-methyl, and triflusulfuron-methyl 12 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
101Kochia scopariaKochia5050
9 United States (Kansas) United StatesKansas1976 Corn (maize), and Railways atrazine 45 Photosystem II inhibitors (C1/5)
101Kochia scopariaKochia1070
10 United States (Colorado) United StatesColorado1982 Corn (maize) atrazine 45 Photosystem II inhibitors (C1/5)
101Kochia scopariaKochia431
11 United States (Montana) United StatesMontana1984 Railways atrazine 45 Photosystem II inhibitors (C1/5)
101Kochia scopariaKochia414
12 United States (Wyoming) United StatesWyoming1984 Corn (maize) atrazine 45 Photosystem II inhibitors (C1/5)
101Kochia scopariaKochia1051
13 United States (Iowa) United StatesIowa1985 Railways atrazine 45 Photosystem II inhibitors (C1/5)
101Kochia scopariaKochia243
14 United States (Wisconsin) United StatesWisconsin1987 Corn (maize), and Railways atrazine 45 Photosystem II inhibitors (C1/5)
101Kochia scopariaKochia416
15 United States (North Dakota) United StatesNorth Dakota1987 Cropland, and Wheat chlorsulfuron, and metsulfuron-methyl 45 ALS inhibitors (B/2)
101Kochia scopariaKochia423
16 United States (Kansas) United StatesKansas1987 Cropland, and Wheat chlorsulfuron 45 ALS inhibitors (B/2)
101Kochia scopariaKochia1042
17 United States (New Mexico) United StatesNew Mexico1988 Railways, and Roadsides sulfometuron-methyl 45 ALS inhibitors (B/2)
101Kochia scopariaKochia256
18 United States (South Dakota) United StatesSouth Dakota1988 Cropland, and Wheat chlorsulfuron 45 ALS inhibitors (B/2)
101Kochia scopariaKochia269
19 United States (Idaho) United StatesIdaho1989 Roadsides, and Wheat chlorsulfuron 45 ALS inhibitors (B/2)
101Kochia scopariaKochia232
20 United States (Montana) United StatesMontana1989 Cropland, and Wheat chlorsulfuron, and metsulfuron-methyl 45 ALS inhibitors (B/2)
101Kochia scopariaKochia420
21 United States (Washington) United StatesWashington1989 Cereals, and Wheat chlorsulfuron 45 ALS inhibitors (B/2)
101Kochia scopariaKochia517
22 United States (Colorado) United StatesColorado1989 Roadsides, and Wheat metsulfuron-methyl, and triasulfuron 45 ALS inhibitors (B/2)
101Kochia scopariaKochia1049
23 United States (Illinois) United StatesIllinois1992 Cropland, and Railways atrazine 45 Photosystem II inhibitors (C1/5)
101Kochia scopariaKochia238
24 United States (Oklahoma) United StatesOklahoma1992 Roadsides, and Wheat chlorsulfuron, metsulfuron-methyl, and sulfometuron-methyl 45 ALS inhibitors (B/2)
101Kochia scopariaKochia1069
25 United States (Oregon) United StatesOregon1993 Wheat chlorsulfuron, metsulfuron-methyl, and triasulfuron 45 ALS inhibitors (B/2)
101Kochia scopariaKochia1175
26 United States (Minnesota) United StatesMinnesota1994 Cropland, and Wheat imazethapyr, thifensulfuron-methyl, and tribenuron-methyl 45 ALS inhibitors (B/2)
101Kochia scopariaKochia248
27 United States (Montana) United StatesMontana1994 Cropland, and Wheat dicamba, and fluroxypyr 45 Synthetic Auxins (O/4)
101Kochia scopariaKochia532
28 United States (Indiana) United StatesIndiana1995 Railways atrazine, cyanazine, and metsulfuron-methyl 45 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
101Kochia scopariaKochia405
29 United States (North Dakota) United StatesNorth Dakota1995 Wheat dicamba 45 Synthetic Auxins (O/4)
101Kochia scopariaKochia1047
30 United States (Illinois) United StatesIllinois1995 Corn (maize), Cropland, and Wheat atrazine, and metsulfuron-methyl 45 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
101Kochia scopariaKochia1126
31 United States (Wisconsin) United StatesWisconsin1995 Roadsides sulfometuron-methyl 45 ALS inhibitors (B/2)
101Kochia scopariaKochia1169
32 United States (Wyoming) United StatesWyoming1996 Wheat metsulfuron-methyl 45 ALS inhibitors (B/2)
101Kochia scopariaKochia1050
33 United States (Idaho) United StatesIdaho1997 Roadsides dicamba 45 Synthetic Auxins (O/4)
101Kochia scopariaKochia1058
34 United States (Utah) United StatesUtah1998 Industrial sites sulfometuron-methyl 45 ALS inhibitors (B/2)
101Kochia scopariaKochia1090
35 United States (North Dakota) United StatesNorth Dakota1998 Corn (maize) atrazine 45 Photosystem II inhibitors (C1/5)
101Kochia scopariaKochia1192
36 United States (Texas) United StatesTexas1998 Wheat metsulfuron-methyl 45 ALS inhibitors (B/2)
101Kochia scopariaKochia5063
37 United States (Colorado) United StatesColorado1999 Corn (maize) dicamba 45 Synthetic Auxins (O/4)
101Kochia scopariaKochia7868
38 United States (North Dakota) United StatesNorth Dakota2004 Railways diuron, metribuzin, and tebuthiuron 45 Multiple Resistance: 2 Sites of Action
Photosystem II inhibitors (C1/5)
PSII inhibitor (Ureas and amides) (C2/7)
101Kochia scopariaKochia10986
39 United States (Michigan) United StatesMichigan2005 Sugar beets imazamox, and triflusulfuron-methyl 45 ALS inhibitors (B/2)
101Kochia scopariaKochia5287
40 United States (Kansas) United StatesKansas2007 Corn (maize), Cotton, and Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
101Kochia scopariaKochia5470
41 United States (Nebraska) United StatesNebraska2009 Corn (maize) dicamba 45 Synthetic Auxins (O/4)
101Kochia scopariaKochia5594
42 United States (South Dakota) United StatesSouth Dakota2009 Corn (maize), and Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
101Kochia scopariaKochia5636
43 United States (Nebraska) United StatesNebraska2011 Corn (maize), and Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
101Kochia scopariaKochia5585
44 United States (North Dakota) United StatesNorth Dakota2012 Corn (maize), and Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
101Kochia scopariaKochia5683
45 United States (Montana) United StatesMontana2012 Cereals glyphosate 45 EPSP synthase inhibitors (G/9)
101Kochia scopariaKochia5711
46 United States (Colorado) United StatesColorado2012 Cereals glyphosate 45 EPSP synthase inhibitors (G/9)
101Kochia scopariaKochia5714
47 United States (Oklahoma) United StatesOklahoma2013 Corn (maize) glyphosate 45 EPSP synthase inhibitors (G/9)
101Kochia scopariaKochia6755
48 United States (Montana) United StatesMontana2013 Wheat glyphosate, metsulfuron-methyl, thifensulfuron-methyl, and tribenuron-methyl 45 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
101Kochia scopariaKochia7810
49 United States (Kansas) United StatesKansas2013 Corn (maize) atrazine, chlorsulfuron, dicamba, and glyphosate 45 Multiple Resistance: 4 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
EPSP synthase inhibitors (G/9)
Synthetic Auxins (O/4)
101Kochia scopariaKochia10972
50 United States (Kansas) United StatesKansas2013 Corn (maize), and Sorghum dicamba, and glyphosate 45 Multiple Resistance: 2 Sites of Action
EPSP synthase inhibitors (G/9)
Synthetic Auxins (O/4)
101Kochia scopariaKochia10973
51 United States (Nebraska) United StatesNebraska2014 Corn (maize) atrazine 45 Photosystem II inhibitors (C1/5)
101Kochia scopariaKochia9926
52 United States (Oregon) United StatesOregon2014 Corn (maize), and Sugar beets glyphosate 45 EPSP synthase inhibitors (G/9)
101Kochia scopariaKochia9944
53 United States (Idaho) United StatesIdaho2014 Corn (maize), and Sugar beets glyphosate 45 EPSP synthase inhibitors (G/9)
101Kochia scopariaKochia9945
54 United States (Wyoming) United StatesWyoming2014 Sugar beets glyphosate 45 EPSP synthase inhibitors (G/9)
101Kochia scopariaKochia10961
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Friday, June 23, 2017 .  Available  www.weedscience.org
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