INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE
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Herbicide Resistant Ragweed Parthenium Globally
(Parthenium hysterophorus)
Herbicide Resistant Ragweed Parthenium Globally
(Parthenium hysterophorus)
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Herbicide Resistant Ragweed Parthenium Globally
(Parthenium hysterophorus)
#CountryFirstYearSituationActive IngredientsSite of Action
1 BrazilBrazil 2004 Soybean chlorimuron-ethyl, cloransulam-methyl, foramsulfuron, imazethapyr, and iodosulfuron-methyl-Na 5 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		124Parthenium hysterophorusRagweed Parthenium5238
2 ColombiaColombia 2004 Fruit glyphosate 10 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
 		124Parthenium hysterophorusRagweed Parthenium5380
3 MexicoMexico 2017 Oranges glyphosate 29 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
 		124Parthenium hysterophorusRagweed Parthenium18196
4 United States (Florida) United StatesFlorida2014 Fallow, Industrial sites, Railways, and Roadsides glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
 		124Parthenium hysterophorusRagweed Parthenium11003
HRAC Global Heap, I.  The International Herbicide-Resistant Weed Database.  Online.  Thursday, October 1, 2026.  Available at  www.weedscience.org

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