International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
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Herbicide Resistant Smooth Pigweed Globally
(Amaranthus hybridus (syn: quitensis))
Herbicide Resistant Smooth Pigweed Globally
(Amaranthus hybridus (syn: quitensis))
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Herbicide Resistant Smooth Pigweed Globally
(Amaranthus hybridus (syn: quitensis))
#CountryFirstYearSituationActive IngredientsSite of Action
1 ArgentinaArgentina 1996 Soybean chlorimuron-ethyl, and imazethapyr 48 ALS inhibitors (B/2)
12Amaranthus hybridus (syn: quitensis)Smooth Pigweed5099
2 ArgentinaArgentina 2013 Soybean glyphosate 48 EPSP synthase inhibitors (G/9)
12Amaranthus hybridus (syn: quitensis)Smooth Pigweed6757
3 ArgentinaArgentina 2014 Corn (maize), and Soybean glyphosate, and imazethapyr 48 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
12Amaranthus hybridus (syn: quitensis)Smooth Pigweed9948
4 ArgentinaArgentina 2016 Soybean 2,4-D, dicamba, and glyphosate 48 Multiple Resistance: 2 Sites of Action
EPSP synthase inhibitors (G/9)
Synthetic Auxins (O/4)
12Amaranthus hybridus (syn: quitensis)Smooth Pigweed17107
5 ArgentinaArgentina 2016 Soybean 2,4-D, and dicamba 48 Synthetic Auxins (O/4)
12Amaranthus hybridus (syn: quitensis)Smooth Pigweed17108
6 BoliviaBolivia 2002 Soybean chlorimuron-ethyl, imazamox, imazethapyr, and oxasulfuron 4 ALS inhibitors (B/2)
12Amaranthus hybridus (syn: quitensis)Smooth Pigweed5242
7 BoliviaBolivia 2005 Soybean fomesafen, lactofen, and sulfentrazone 4 PPO inhibitors (E/14)
12Amaranthus hybridus (syn: quitensis)Smooth Pigweed5411
8 Canada (Ontario) CanadaOntario2004 Corn (maize) bentazon, and bromoxynil 7 PSII inhibitors (Nitriles) (C3/6)
12Amaranthus hybridus (syn: quitensis)Smooth Pigweed5472
9 FranceFrance 1980 Corn (maize) atrazine 17 Photosystem II inhibitors (C1/5)
12Amaranthus hybridus (syn: quitensis)Smooth Pigweed453
10 IsraelIsrael 1986 Cropland atrazine 23 Photosystem II inhibitors (C1/5)
12Amaranthus hybridus (syn: quitensis)Smooth Pigweed101
11 ItalyItaly 1978 Corn (maize) atrazine 24 Photosystem II inhibitors (C1/5)
12Amaranthus hybridus (syn: quitensis)Smooth Pigweed114
12 South AfricaSouth Africa 1993 Corn (maize) atrazine 37 Photosystem II inhibitors (C1/5)
12Amaranthus hybridus (syn: quitensis)Smooth Pigweed193
13 SpainSpain 1985 Corn (maize) atrazine 38 Photosystem II inhibitors (C1/5)
12Amaranthus hybridus (syn: quitensis)Smooth Pigweed175
14 SwitzerlandSwitzerland 1982 Vegetables simazine 41 Photosystem II inhibitors (C1/5)
12Amaranthus hybridus (syn: quitensis)Smooth Pigweed198
15 United States (Maryland) United StatesMaryland1972 Corn (maize), and Cropland atrazine 45 Photosystem II inhibitors (C1/5)
12Amaranthus hybridus (syn: quitensis)Smooth Pigweed429
16 United States (Virginia) United StatesVirginia1976 Corn (maize) atrazine 45 Photosystem II inhibitors (C1/5)
12Amaranthus hybridus (syn: quitensis)Smooth Pigweed273
17 United States (Delaware) United StatesDelaware1977 Corn (maize) atrazine 45 Photosystem II inhibitors (C1/5)
12Amaranthus hybridus (syn: quitensis)Smooth Pigweed492
18 United States (North Carolina) United StatesNorth Carolina1980 Corn (maize) atrazine 45 Photosystem II inhibitors (C1/5)
12Amaranthus hybridus (syn: quitensis)Smooth Pigweed262
19 United States (Pennsylvania) United StatesPennsylvania1980 Corn (maize) atrazine 45 Photosystem II inhibitors (C1/5)
12Amaranthus hybridus (syn: quitensis)Smooth Pigweed264
20 United States (New Jersey) United StatesNew Jersey1980 Corn (maize) atrazine 45 Photosystem II inhibitors (C1/5)
12Amaranthus hybridus (syn: quitensis)Smooth Pigweed494
21 United States (New York) United StatesNew York1980 Corn (maize) atrazine, metribuzin, and simazine 45 Photosystem II inhibitors (C1/5)
12Amaranthus hybridus (syn: quitensis)Smooth Pigweed5225
22 United States (Wisconsin) United StatesWisconsin1985 Corn (maize) atrazine 45 Photosystem II inhibitors (C1/5)
12Amaranthus hybridus (syn: quitensis)Smooth Pigweed418
23 United States (Kentucky) United StatesKentucky1987 Corn (maize) atrazine, and simazine 45 Photosystem II inhibitors (C1/5)
12Amaranthus hybridus (syn: quitensis)Smooth Pigweed489
24 United States (Kentucky) United StatesKentucky1992 Soybean chlorimuron-ethyl, flumetsulam, imazaquin, imazethapyr, nicosulfuron, primisulfuron-methyl, and thifensulfuron-methyl 45 ALS inhibitors (B/2)
12Amaranthus hybridus (syn: quitensis)Smooth Pigweed490
25 United States (Illinois) United StatesIllinois1993 Corn (maize) atrazine 45 Photosystem II inhibitors (C1/5)
12Amaranthus hybridus (syn: quitensis)Smooth Pigweed236
26 United States (Virginia) United StatesVirginia1994 Corn (maize), and Soybean imazaquin, and imazethapyr 45 ALS inhibitors (B/2)
12Amaranthus hybridus (syn: quitensis)Smooth Pigweed278
27 United States (Illinois) United StatesIllinois1998 Soybean imazethapyr, and primisulfuron-methyl 45 ALS inhibitors (B/2)
12Amaranthus hybridus (syn: quitensis)Smooth Pigweed7859
28 United States (Delaware) United StatesDelaware2000 Vegetables imazethapyr 45 ALS inhibitors (B/2)
12Amaranthus hybridus (syn: quitensis)Smooth Pigweed5160
29 United States (Illinois) United StatesIllinois2000 Corn (maize) atrazine, imazethapyr, and primisulfuron-methyl 45 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
12Amaranthus hybridus (syn: quitensis)Smooth Pigweed7860
30 United States (Ohio) United StatesOhio2001 Soybean flumetsulam, and thifensulfuron-methyl 45 ALS inhibitors (B/2)
12Amaranthus hybridus (syn: quitensis)Smooth Pigweed5233
31 United States (Michigan) United StatesMichigan2002 Soybean chlorimuron-ethyl, imazamox, and thifensulfuron-methyl 45 ALS inhibitors (B/2)
12Amaranthus hybridus (syn: quitensis)Smooth Pigweed5170
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Saturday, December 16, 2017 .  Available  www.weedscience.org
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