INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE
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Herbicide Resistant Powell Amaranth Globally
(Amaranthus powellii)
Herbicide Resistant Powell Amaranth Globally
(Amaranthus powellii)
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Herbicide Resistant Powell Amaranth Globally
(Amaranthus powellii)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Canada (Ontario) CanadaOntario1977 Corn (maize) atrazine, and metribuzin 7 PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
 		15Amaranthus powelliiPowell Amaranth1158
2 Canada (Ontario) CanadaOntario1998 Corn (maize), Cropland, and Soybean imazethapyr, and thifensulfuron-methyl 7 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		15Amaranthus powelliiPowell Amaranth1159
3 Canada (Ontario) CanadaOntario1998 Corn (maize), Soybean, and Wheat atrazine, imazethapyr, and metribuzin 7 Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
 		15Amaranthus powelliiPowell Amaranth5049
4 Canada (Ontario) CanadaOntario1999 Carrots atrazine, linuron, monolinuron, and prometryne 7 PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
 		15Amaranthus powelliiPowell Amaranth5048
5 Canada (Manitoba) CanadaManitoba2008 Beans, and Wheat thifensulfuron-methyl, and tribenuron-methyl 7 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		15Amaranthus powelliiPowell Amaranth5631
6 Canada (Quebec) CanadaQuebec2012 Carrots linuron 7 PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
 		15Amaranthus powelliiPowell Amaranth17123
7 Canada (Quebec) CanadaQuebec2012 Soybean imazethapyr 7 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		15Amaranthus powelliiPowell Amaranth17124
8 Canada (Ontario) CanadaOntario2019 Soybean aminocyclopyrachlor, dichlorprop, imazethapyr, MCPA, and mecoprop 7 Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Auxin Mimics HRAC Group 4 (Legacy O)
 		15Amaranthus powelliiPowell Amaranth24243
9 Czech RepublicCzech Republic 1989 Orchards atrazine, cyanazine, prometryne, simazine, and terbutryne 12 PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
 		15Amaranthus powelliiPowell Amaranth78
10 FranceFrance 1982 Corn (maize) atrazine 17 PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
 		15Amaranthus powelliiPowell Amaranth452
11 SwitzerlandSwitzerland 1986 Corn (maize) atrazine 41 PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
 		15Amaranthus powelliiPowell Amaranth197
12 United States (Washington) United StatesWashington1992 Mint terbacil 45 PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
 		15Amaranthus powelliiPowell Amaranth331
13 United States (Ohio) United StatesOhio1996 Soybean imazaquin 45 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		15Amaranthus powelliiPowell Amaranth1100
14 United States (Michigan) United StatesMichigan2001 Asparagus, and Nurseries atrazine, and diuron 45 PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
 		15Amaranthus powelliiPowell Amaranth5176
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