INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE
select
select
Herbicide Resistant Powell Amaranth Globally
(Amaranthus powellii)
Herbicide Resistant Powell Amaranth Globally
(Amaranthus powellii)
Drag a column header and drop it here to group by that column
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
HRAC Global Heap, I.  The International Herbicide-Resistant Weed Database.  Online.  Sunday, October 4, 2026.  Available at  www.weedscience.org

Copyright © 1993- 2026 WeedScience.org. All rights reserved.

Normal scientific reference, citation, and limited use of individual records are permitted. Automated or systematic data extraction, bulk copying, database replication or synchronization, AI or machine-learning use, predictive-model development, redistribution, and commercial reuse are not permitted without prior written permission from WeedScience.org.

See our Data Use and AI Policy.