INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE
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Herbicide Resistant Sumatran Fleabane Globally
(Conyza sumatrensis)
Herbicide Resistant Sumatran Fleabane Globally
(Conyza sumatrensis)
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Herbicide Resistant Sumatran Fleabane Globally
(Conyza sumatrensis)
#CountryFirstYearSituationActive IngredientsSite of Action
1 ArgentinaArgentina 2014 Soybean glyphosate 48 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
 		65Conyza sumatrensisSumatran Fleabane32270
2 Australia (Queensland) AustraliaQueensland2018 Fallow, and Wheat paraquat 1 PS I Electron Diversion HRAC Group 22 (Legacy D)
 		65Conyza sumatrensisSumatran Fleabane17148
3 Australia (Queensland) AustraliaQueensland2018 Fallow glyphosate 1 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
 		65Conyza sumatrensisSumatran Fleabane18161
4 BoliviaBolivia 2024 Soybean paraquat 4 PS I Electron Diversion HRAC Group 22 (Legacy D)
 		65Conyza sumatrensisSumatran Fleabane31271
5 BrazilBrazil 2010 Corn (maize), and Soybean glyphosate 5 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
 		65Conyza sumatrensisSumatran Fleabane5577
6 BrazilBrazil 2011 Soybean chlorimuron-ethyl 5 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		65Conyza sumatrensisSumatran Fleabane5647
7 BrazilBrazil 2011 Corn (maize), and Soybean chlorimuron-ethyl, and glyphosate 5 Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
 		65Conyza sumatrensisSumatran Fleabane5648
8 BrazilBrazil 2016 Soybean paraquat 5 PS I Electron Diversion HRAC Group 22 (Legacy D)
 		65Conyza sumatrensisSumatran Fleabane16082
9 BrazilBrazil 2017 Soybean saflufenacil 5 Inhibition of Protoporphyrinogen Oxidase HRAC Group 14 (Legacy E)
 		65Conyza sumatrensisSumatran Fleabane17099
10 BrazilBrazil 2017 Soybean chlorimuron-ethyl, glyphosate, and paraquat 5 Multiple Resistance: 3 Sites of Action
Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
PS I Electron Diversion HRAC Group 22 (Legacy D)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
 		65Conyza sumatrensisSumatran Fleabane17102
11 BrazilBrazil 2017 Soybean 2,4-D, diuron, glyphosate, paraquat, and saflufenacil 5 Multiple Resistance: 5 Sites of Action
PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
PS I Electron Diversion HRAC Group 22 (Legacy D)
Inhibition of Protoporphyrinogen Oxidase HRAC Group 14 (Legacy E)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
Auxin Mimics HRAC Group 4 (Legacy O)
 		65Conyza sumatrensisSumatran Fleabane17135
12 FranceFrance 2010 Grapes glyphosate 17 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
 		65Conyza sumatrensisSumatran Fleabane9932
13 FranceFrance 2016 Grapes flazasulfuron, iodosulfuron-methyl-Na, mesosulfuron-methyl, and penoxsulam 17 Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
 		65Conyza sumatrensisSumatran Fleabane17114
14 FranceFrance 2016 Grapes flazasulfuron, glyphosate, iodosulfuron-methyl-Na, mesosulfuron-methyl, and penoxsulam 17 Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
 		65Conyza sumatrensisSumatran Fleabane17115
15 GreeceGreece 2012 Grapes, Olive, and Orchards glyphosate 19 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
 		65Conyza sumatrensisSumatran Fleabane5691
16 JapanJapan 1986 Mulberry, Orchards, and Roadsides diquat, and paraquat 25 PS I Electron Diversion HRAC Group 22 (Legacy D)
 		65Conyza sumatrensisSumatran Fleabane126
17 MalaysiaMalaysia 1990 Vegetables paraquat 28 PS I Electron Diversion HRAC Group 22 (Legacy D)
 		65Conyza sumatrensisSumatran Fleabane138
18 ParaguayParaguay 2017 Soybean chlorimuron-ethyl, glyphosate, and paraquat 46 Multiple Resistance: 3 Sites of Action
Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
PS I Electron Diversion HRAC Group 22 (Legacy D)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
 		65Conyza sumatrensisSumatran Fleabane18153
19 SpainSpain 2009 Orchards glyphosate 38 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
 		65Conyza sumatrensisSumatran Fleabane5481
20 Sri LankaSri Lanka 1998 Tea paraquat 39 PS I Electron Diversion HRAC Group 22 (Legacy D)
 		65Conyza sumatrensisSumatran Fleabane1184
21 TaiwanTaiwan 1980 Cropland, Railways, and Roadsides paraquat 42 PS I Electron Diversion HRAC Group 22 (Legacy D)
 		65Conyza sumatrensisSumatran Fleabane214
22 TurkeyTurkey 2019 Peaches glyphosate 71 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
 		65Conyza sumatrensisSumatran Fleabane18164
HRAC Global Heap, I.  The International Herbicide-Resistant Weed Database.  Online.  Sunday, October 4, 2026.  Available at  www.weedscience.org

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