INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE
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Herbicide Resistant Rice Flatsedge Globally
(Cyperus iria)
Herbicide Resistant Rice Flatsedge Globally
(Cyperus iria)
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Herbicide Resistant Rice Flatsedge Globally
(Cyperus iria)
#CountryFirstYearSituationActive IngredientsSite of Action
1 BrazilBrazil 2014 Rice bispyribac-sodium, imazapic, imazethapyr, penoxsulam, and pyrazosulfuron-ethyl 5 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		266Cyperus iriaRice Flatsedge13040
2 Dominican RepublicDominican Republic 2024 Rice bispyribac-sodium, 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)
 		266Cyperus iriaRice Flatsedge36287
3 United States (Arkansas) United StatesArkansas2010 Rice bispyribac-sodium, halosulfuron-methyl, imazamox, imazethapyr, and penoxsulam 45 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		266Cyperus iriaRice Flatsedge5560
4 United States (Louisiana) United StatesLouisiana2013 Rice halosulfuron-methyl 45 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		266Cyperus iriaRice Flatsedge7785
5 VenezuelaVenezuela 2015 Rice pyrazosulfuron-ethyl 80 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		266Cyperus iriaRice Flatsedge11015
HRAC Global Heap, I.  The International Herbicide-Resistant Weed Database.  Online.  Thursday, October 1, 2026.  Available at  www.weedscience.org

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