International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
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Herbicide Resistant Horseweed Globally
(Conyza canadensis)
Herbicide Resistant Horseweed Globally
(Conyza canadensis)
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Herbicide Resistant Horseweed Globally
(Conyza canadensis)
#CountryFirstYearSituationActive IngredientsSite of Action
1 BelgiumBelgium 1989 Corn (maize), Nurseries, and Roadsides atrazine 3 Photosystem II inhibitors (C1/5)
61Conyza canadensisHorseweed35
2 BelgiumBelgium 1998 Nurseries paraquat 3 PSI Electron Diverter (D/22)
61Conyza canadensisHorseweed1145
3 BrazilBrazil 2005 Fruit, Orchards, and Soybean glyphosate 5 EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed5273
4 Canada (Ontario) CanadaOntario1993 Peaches paraquat 7 PSI Electron Diverter (D/22)
61Conyza canadensisHorseweed48
5 Canada (Ontario) CanadaOntario2010 Soybean glyphosate 7 EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed5665
6 Canada (Ontario) CanadaOntario2011 Soybean cloransulam-methyl, and glyphosate 7 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed5666
7 ChinaChina 2006 Orchards glyphosate 9 EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed5277
8 Czech RepublicCzech Republic 1987 Corn (maize), Nurseries, Orchards, Pastures, Railways, and Roadsides atrazine 12 Photosystem II inhibitors (C1/5)
61Conyza canadensisHorseweed83
9 Czech RepublicCzech Republic 2007 Railways glyphosate 12 EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed5317
10 FranceFrance 1981 Cropland atrazine 17 Photosystem II inhibitors (C1/5)
61Conyza canadensisHorseweed460
11 FranceFrance 1988 Orchards linuron 17 PSII inhibitor (Ureas and amides) (C2/7)
61Conyza canadensisHorseweed451
12 GreeceGreece 2012 Grapes, and Orchards glyphosate 19 EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed5692
13 HungaryHungary 2016 Grapes glyphosate 20 EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed15070
14 IsraelIsrael 1993 Forests, Industrial sites, and Roadsides atrazine, chlorsulfuron, imazapyr, metribuzin, pyrithiobac-sodium, and sulfometuron-methyl 23 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
61Conyza canadensisHorseweed109
15 ItalyItaly 2011 Orchards glyphosate 24 EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed5617
16 JapanJapan 1980 Grapes, Orchards, Railways, and Roadsides paraquat 25 PSI Electron Diverter (D/22)
61Conyza canadensisHorseweed119
17 JapanJapan 2014 Railways glyphosate 25 EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed10999
18 PolandPoland 1983 Orchards simazine 33 Photosystem II inhibitors (C1/5)
61Conyza canadensisHorseweed168
19 PolandPoland 2000 Railways imazapyr 33 ALS inhibitors (B/2)
61Conyza canadensisHorseweed5081
20 PolandPoland 2010 Railways glyphosate 33 EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed5622
21 PortugalPortugal 2011 Olive glyphosate 34 EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed7824
22 South KoreaSouth Korea 2017 Orchards glyphosate 27 EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed16077
23 SpainSpain 1987 Corn (maize), Orchards, and Roadsides atrazine, and simazine 38 Photosystem II inhibitors (C1/5)
61Conyza canadensisHorseweed177
24 SpainSpain 2006 Orchards glyphosate 38 EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed5319
25 SwitzerlandSwitzerland 1982 Corn (maize), Nurseries, Orchards, Pastures, Railways, and Roadsides atrazine, and simazine 41 Photosystem II inhibitors (C1/5)
61Conyza canadensisHorseweed203
26 United KingdomUnited Kingdom 1982 Orchards simazine 44 Photosystem II inhibitors (C1/5)
61Conyza canadensisHorseweed362
27 United States (Mississippi) United StatesMississippi1994 Soybean paraquat 45 PSI Electron Diverter (D/22)
61Conyza canadensisHorseweed1109
28 United States (Delaware) United StatesDelaware2000 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed5086
29 United States (Tennessee) United StatesTennessee2001 Cotton, and Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed5122
30 United States (Ohio) United StatesOhio2001 Soybean chlorimuron-ethyl, and cloransulam-methyl 45 ALS inhibitors (B/2)
61Conyza canadensisHorseweed5157
31 United States (Kentucky) United StatesKentucky2001 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed5208
32 United States (Ohio) United StatesOhio2002 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed5127
33 United States (Indiana) United StatesIndiana2002 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed5128
34 United States (Maryland) United StatesMaryland2002 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed5129
35 United States (New Jersey) United StatesNew Jersey2002 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed5130
36 United States (Michigan) United StatesMichigan2002 Corn (maize), and Soybean chlorimuron-ethyl, and cloransulam-methyl 45 ALS inhibitors (B/2)
61Conyza canadensisHorseweed5172
37 United States (Michigan) United StatesMichigan2002 Blueberries atrazine, diuron, and simazine 45 Multiple Resistance: 2 Sites of Action
Photosystem II inhibitors (C1/5)
PSII inhibitor (Ureas and amides) (C2/7)
61Conyza canadensisHorseweed5173
38 United States (Michigan) United StatesMichigan2002 Blueberries diuron 45 PSII inhibitor (Ureas and amides) (C2/7)
61Conyza canadensisHorseweed5174
39 United States (Missouri) United StatesMissouri2002 Corn (maize), Cotton, and Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed5260
40 United States (Ohio) United StatesOhio2003 Soybean chlorimuron-ethyl, cloransulam-methyl, and glyphosate 45 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed5158
41 United States (Arkansas) United StatesArkansas2003 Cotton glyphosate 45 EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed5187
42 United States (Mississippi) United StatesMississippi2003 Corn (maize), Cotton, Rice, and Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed5195
43 United States (North Carolina) United StatesNorth Carolina2003 Cotton glyphosate 45 EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed5200
44 United States (Delaware) United StatesDelaware2003 Soybean paraquat 45 PSI Electron Diverter (D/22)
61Conyza canadensisHorseweed5257
45 United States (Pennsylvania) United StatesPennsylvania2003 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed5258
46 United States (California) United StatesCalifornia2005 Corn (maize), Fencelines, Grapes, Orchards, Roadsides, and Wheat glyphosate 45 EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed5250
47 United States (Illinois) United StatesIllinois2005 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed5276
48 United States (Kansas) United StatesKansas2005 Cotton, and Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed5308
49 United States (Virginia) United StatesVirginia2005 Corn (maize), and Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed5559
50 United States (Indiana) United StatesIndiana2005 Soybean chlorimuron-ethyl, and cloransulam-methyl 45 ALS inhibitors (B/2)
61Conyza canadensisHorseweed7836
51 United States (Nebraska) United StatesNebraska2006 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed5496
52 United States (Michigan) United StatesMichigan2007 Nurseries glyphosate 45 EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed5312
53 United States (Mississippi) United StatesMississippi2007 Soybean glyphosate, and paraquat 45 Multiple Resistance: 2 Sites of Action
PSI Electron Diverter (D/22)
EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed5384
54 United States (West Virginia) United StatesWest Virginia2007 Corn (maize), and Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed7774
55 United States (Oklahoma) United StatesOklahoma2009 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed5528
56 United States (South Dakota) United StatesSouth Dakota2010 Corn (maize), and Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed5634
57 United States (Delaware) United StatesDelaware2010 Soybean, and Wheat glyphosate, thifensulfuron-methyl, and tribenuron-methyl 45 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed5710
58 United States (Iowa) United StatesIowa2011 Corn (maize), and Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed5567
59 United States (Kansas) United StatesKansas2011 Corn (maize), Cotton, Soybean, and Wheat chlorsulfuron, iodosulfuron-methyl-sodium, metsulfuron-methyl, rimsulfuron, thiencarbazone-methyl, thifensulfuron-methyl, and tribenuron-methyl 45 ALS inhibitors (B/2)
61Conyza canadensisHorseweed7806
60 United States (Alabama) United StatesAlabama2013 Corn (maize), Cotton, and Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed7783
61 United States (Wisconsin) United StatesWisconsin2013 Soybean glyphosate 45 EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed7823
62 United States (Illinois) United StatesIllinois2013 Soybean cloransulam-methyl 45 ALS inhibitors (B/2)
61Conyza canadensisHorseweed7865
63 United States (California) United StatesCalifornia2014 Almonds glyphosate, and paraquat 45 Multiple Resistance: 2 Sites of Action
PSI Electron Diverter (D/22)
EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed9943
64 United States (Montana) United StatesMontana2015 Roadsides glyphosate 45 EPSP synthase inhibitors (G/9)
61Conyza canadensisHorseweed11011
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Friday, November 17, 2017 .  Available  www.weedscience.org
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