INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE
select
select
Herbicide Resistant Canada thistle Globally
(Cirsium arvense)
Herbicide Resistant Canada thistle Globally
(Cirsium arvense)
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Herbicide Resistant Canada thistle Globally
(Cirsium arvense)
#CountryFirstYearSituationActive IngredientsSite of Action
1 HungaryHungary 1985 Pastures 2,4-D, and MCPA 20 Auxin Mimics HRAC Group 4 (Legacy O)
 		55Cirsium arvenseCanada thistle306
2 SwedenSweden 1979 Cropland MCPA 40 Auxin Mimics HRAC Group 4 (Legacy O)
 		55Cirsium arvenseCanada thistle395
HRAC Global Heap, I.  The International Herbicide-Resistant Weed Database.  Online.  Sunday, October 4, 2026.  Available at  www.weedscience.org

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