INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE
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Herbicide Resistant Late Watergrass Globally
(Echinochloa phyllopogon (=E. oryzicola))
Herbicide Resistant Late Watergrass Globally
(Echinochloa phyllopogon (=E. oryzicola))
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Herbicide Resistant Late Watergrass Globally
(Echinochloa phyllopogon (=E. oryzicola))
#CountryFirstYearSituationActive IngredientsSite of Action
1 ChinaChina 2023 Rice penoxsulam 9 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		178Echinochloa phyllopogon (=E. oryzicola)Late Watergrass27267
2 FranceFrance 2013 Rice penoxsulam 17 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		178Echinochloa phyllopogon (=E. oryzicola)Late Watergrass9935
3 GreeceGreece 2009 Rice bispyribac-sodium, foramsulfuron, imazamox, nicosulfuron, penoxsulam, and rimsulfuron 19 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		178Echinochloa phyllopogon (=E. oryzicola)Late Watergrass13052
4 PortugalPortugal 2015 Rice penoxsulam 34 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		178Echinochloa phyllopogon (=E. oryzicola)Late Watergrass27294
5 PortugalPortugal 2020 Rice profoxydim 34 Inhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)
 		178Echinochloa phyllopogon (=E. oryzicola)Late Watergrass28268
6 PortugalPortugal 2020 Rice penoxsulam, and profoxydim 34 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)
 		178Echinochloa phyllopogon (=E. oryzicola)Late Watergrass28269
7 South KoreaSouth Korea 2006 Rice azimsulfuron, bensulfuron-methyl, bispyribac-sodium, cyhalofop-butyl, fenoxaprop-ethyl, halosulfuron-methyl, imazosulfuron, metamifop, pyrazosulfuron-ethyl, pyribenzoxim, and pyriminobac-methyl 27 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)
 		178Echinochloa phyllopogon (=E. oryzicola)Late Watergrass5392
8 United States (California) United StatesCalifornia1998 Rice fenoxaprop-ethyl 45 Inhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)
 		178Echinochloa phyllopogon (=E. oryzicola)Late Watergrass283
9 United States (California) United StatesCalifornia1998 Rice thiobencarb/benthiocarb 45 Very Long-Chain Fatty Acid Synthesis inhibitorsHRAC Group 15 (Legacy K3 N)
 		178Echinochloa phyllopogon (=E. oryzicola)Late Watergrass1035
10 United States (California) United StatesCalifornia2000 Rice cyhalofop-butyl, fenoxaprop-ethyl, molinate, and thiobencarb/benthiocarb 45 Multiple Resistance: 2 Sites of Action
Inhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)
Very Long-Chain Fatty Acid Synthesis inhibitorsHRAC Group 15 (Legacy K3 N)
 		178Echinochloa phyllopogon (=E. oryzicola)Late Watergrass5137
HRAC Global Heap, I.  The International Herbicide-Resistant Weed Database.  Online.  Sunday, October 4, 2026.  Available at  www.weedscience.org

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