INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE
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Herbicide Resistant Red Rice Globally
(Oryza sativa var. sylvatica)
Herbicide Resistant Red Rice Globally
(Oryza sativa var. sylvatica)
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Herbicide Resistant Red Rice Globally
(Oryza sativa var. sylvatica)
#CountryFirstYearSituationActive IngredientsSite of Action
1 ArgentinaArgentina 2018 Rice imazapic, imazapyr, and imazethapyr 48 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		242Oryza sativa var. sylvaticaRed Rice27289
2 BrazilBrazil 2006 Rice imazapic, and imazethapyr 5 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		242Oryza sativa var. sylvaticaRed Rice5372
3 BrazilBrazil 2025 Rice imazethapyr, and quizalofop-ethyl 5 Multiple Resistance: 2 Sites of Action
Inhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)
Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		242Oryza sativa var. sylvaticaRed Rice36294
4 ColombiaColombia 2018 Rice imazamox, and imazapyr 10 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		242Oryza sativa var. sylvaticaRed Rice18170
5 Costa RicaCosta Rica 2010 Rice imazapic, and imazapyr 11 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		242Oryza sativa var. sylvaticaRed Rice7885
6 Dominican RepublicDominican Republic 2024 Rice bispyribac-sodium, clethodim, cyhalofop-butyl, diclofop-methyl, imazamox, penoxsulam, and propanil 96 Multiple Resistance: 3 Sites of Action
Inhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)
Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
 		242Oryza sativa var. sylvaticaRed Rice36286
7 GreeceGreece 2013 Rice imazamox, and imazethapyr 19 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		242Oryza sativa var. sylvaticaRed Rice13054
8 ItalyItaly 2010 Rice imazamox 24 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		242Oryza sativa var. sylvaticaRed Rice5614
9 MalaysiaMalaysia 2018 Rice imazapic, and imazapyr 28 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		242Oryza sativa var. sylvaticaRed Rice17145
10 TurkeyTurkey 2020 Rice imazamox 71 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		242Oryza sativa var. sylvaticaRed Rice19217
11 United States (Arkansas) United StatesArkansas2002 Rice imazamox, imazapyr, imazaquin, imazethapyr, and pyrithiobac-sodium 45 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		242Oryza sativa var. sylvaticaRed Rice13046
HRAC Global Heap, I.  The International Herbicide-Resistant Weed Database.  Online.  Tuesday, September 29, 2026.  Available at  www.weedscience.org

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