INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE
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Herbicide Resistant Pale Smartweed Globally
(Polygonum lapathifolium)
Herbicide Resistant Pale Smartweed Globally
(Polygonum lapathifolium)
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Herbicide Resistant Pale Smartweed Globally
(Polygonum lapathifolium)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Canada (Manitoba) CanadaManitoba2009 Wheat thifensulfuron-methyl, and tribenuron-methyl 7 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		134Polygonum lapathifoliumPale Smartweed5625
2 Canada (Alberta) CanadaAlberta2014 Wheat imazethapyr 7 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		134Polygonum lapathifoliumPale Smartweed11002
3 Czech RepublicCzech Republic 1982 Railways atrazine, cyanazine, lenacil, prometryne, terbuthylazine, and terbutryne 12 PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
 		134Polygonum lapathifoliumPale Smartweed80
4 FranceFrance 1979 Corn (maize), and Cropland atrazine 17 PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
 		134Polygonum lapathifoliumPale Smartweed466
5 GermanyGermany 1988 Corn (maize) atrazine 18 PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
 		134Polygonum lapathifoliumPale Smartweed445
6 SpainSpain 1991 Corn (maize) atrazine 38 PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
 		134Polygonum lapathifoliumPale Smartweed189
HRAC Global Heap, I.  The International Herbicide-Resistant Weed Database.  Online.  Sunday, October 4, 2026.  Available at  www.weedscience.org

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