INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE
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Herbicide Resistant Capeweed Globally
(Arctotheca calendula)
Herbicide Resistant Capeweed Globally
(Arctotheca calendula)
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Herbicide Resistant Capeweed Globally
(Arctotheca calendula)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Australia (Victoria) AustraliaVictoria1986 Alfalfa diquat 1 PS I Electron Diversion HRAC Group 22 (Legacy D)
 		21Arctotheca calendulaCapeweed22
2 Australia (South Australia) AustraliaSouth Australia2015 Fallow 2,4-D 1 Auxin Mimics HRAC Group 4 (Legacy O)
 		21Arctotheca calendulaCapeweed15055
3 Australia (Western Australia) AustraliaWestern Australia2020 Wheat diflufenican, glyphosate, and metosulam 1 Multiple Resistance: 3 Sites of Action
Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Phytoene Desaturase inhibitorsHRAC Group 12 (Legacy F1)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
 		21Arctotheca calendulaCapeweed19216
4 Australia (Western Australia) AustraliaWestern Australia2021 Fallow glyphosate 1 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
 		21Arctotheca calendulaCapeweed32276
HRAC Global Heap, I.  The International Herbicide-Resistant Weed Database.  Online.  Sunday, October 4, 2026.  Available at  www.weedscience.org

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