INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

HRAC GROUP 2 (LEGACY B) RESISTANT SUMATRAN FLEABANE
(Conyza sumatrensis)


Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Brazil, Paraná
INTRODUCTION SUMATRAN FLEABANE
Sumatran Fleabane (Conyza sumatrensis) is a dicot weed in the Asteraceae family.  In Brazil this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2011 and infests Soybean.   Group 2 (Legacy B) herbicides are known as Inhibition of Acetolactate Synthase (Inhibition of Acetolactate Synthase ).  Research has shown that these particular biotypes are resistant to chlorimuron-ethyl and they may be cross-resistant to other Group 2 (Legacy B) herbicides.

The 'Group' letters/numbers that you see throughout this web site refer to the classification of herbicides by their site of action. To see a full list of herbicides and HRAC herbicide classifications click here.

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QUIK STATS (last updated Jun 06, 2012 )

Common NameSumatran Fleabane
SpeciesConyza sumatrensis
GroupInhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicideschlorimuron-ethyl
LocationBrazil, Paraná
Year2011
Situation(s)Soybean
Contributors - (Alphabetically)Jamil Constantin, Rubem Oliveira, and Gizelly Santos 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Sumatran Fleabane biotype with this Sumatran Fleabane biotype have been used to confirm resistance. For further information on the tests conducted please contact the local weed scientists that provided this information.
 
Genetics

Genetic studies on HRAC Group 2 resistant Sumatran Fleabane have not been reported to the site.  There may be a note below or an article discussing the genetics of this biotype in the Fact Sheets and Other Literature
 
Mechanism of Resistance

The mechanism of resistance for this biotype is either unknown or has not been entered in the database.  If you know anything about the mechanism of resistance for this biotype then please update the database.
 
Relative Fitness

There is no record of differences in fitness or competitiveness of these resistant biotypes when compared to that of normal susceptible biotypes.  If you have any information pertaining to the fitness of Group 2 (Legacy B) resistant Sumatran Fleabane from Brazil please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

JAMIL CONSTANTIN
Associate Professor
Universidade Estadual de Maringá
Departamento de Agronomia
Av. Colombo
5790
Maringá, PR, 87020-900, Paraná
Brazil
Email Jamil Constantin
Web   : Web Site Link
RUBEM OLIVEIRA
Associate Professor
Universidade Estadual De Maringá - Departamento De Agronomia
Núcleo De Estudos Avançados Em Ciência Das Plantas Daninhas
Av. Colombo 5790
Maringá, 87020-900, Paraná
Brazil
Email Rubem Oliveira
Web   : Web Site Link
GIZELLY SANTOS
PhD Student
Universidade Estadual de Maringá
Departamento de Agronomia
Av. Colombo
5790
Maringá, 87020-900, Paraná
Brazil
Email Gizelly Santos
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Brazil have been instrumental in providing you this information. Particular thanks is given to Jamil Constantin, Rubem Oliveira, and Gizelly Santos for providing detailed information.
Herbicide Resistant Sumatran Fleabane Globally
(Conyza sumatrensis)
Herbicide Resistant Sumatran Fleabane Globally
(Conyza sumatrensis)
Drag a column header and drop it here to group by that column
Herbicide Resistant Sumatran Fleabane Globally
(Conyza sumatrensis)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Australia (Queensland) AustraliaQueensland2018 Fallow, and Wheat paraquat 1 PS I Electron Diversion ( HRAC Group 22 (Legacy D)
65Conyza sumatrensisSumatran Fleabane17148
2 Australia (Queensland) AustraliaQueensland2018 Fallow glyphosate 1 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
65Conyza sumatrensisSumatran Fleabane18161
3 BrazilBrazil 2010 Corn (maize), and Soybean glyphosate 5 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
65Conyza sumatrensisSumatran Fleabane5577
4 BrazilBrazil 2011 Soybean chlorimuron-ethyl 5 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
65Conyza sumatrensisSumatran Fleabane5647
5 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
6 BrazilBrazil 2016 Soybean paraquat 5 PS I Electron Diversion ( HRAC Group 22 (Legacy D)
65Conyza sumatrensisSumatran Fleabane16082
7 BrazilBrazil 2017 Soybean saflufenacil 5 Inhibition of Protoporphyrinogen Oxidase ( HRAC Group 14 (Legacy E)
65Conyza sumatrensisSumatran Fleabane17099
8 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
9 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
10 FranceFrance 2010 Grapes glyphosate 17 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
65Conyza sumatrensisSumatran Fleabane9932
11 FranceFrance 2016 Grapes flazasulfuron, iodosulfuron-methyl-Na, mesosulfuron-methyl, and penoxsulam 17 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
65Conyza sumatrensisSumatran Fleabane17114
12 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
13 GreeceGreece 2012 Grapes, Olive, and Orchards glyphosate 19 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
65Conyza sumatrensisSumatran Fleabane5691
14 JapanJapan 1986 Mulberry, Orchards, and Roadsides diquat, and paraquat 25 PS I Electron Diversion ( HRAC Group 22 (Legacy D)
65Conyza sumatrensisSumatran Fleabane126
15 MalaysiaMalaysia 1990 Vegetables paraquat 28 PS I Electron Diversion ( HRAC Group 22 (Legacy D)
65Conyza sumatrensisSumatran Fleabane138
16 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
17 SpainSpain 2009 Orchards glyphosate 38 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
65Conyza sumatrensisSumatran Fleabane5481
18 Sri LankaSri Lanka 1998 Tea paraquat 39 PS I Electron Diversion ( HRAC Group 22 (Legacy D)
65Conyza sumatrensisSumatran Fleabane1184
19 TaiwanTaiwan 1980 Cropland, Railways, and Roadsides paraquat 42 PS I Electron Diversion ( HRAC Group 22 (Legacy D)
65Conyza sumatrensisSumatran Fleabane214
20 TurkeyTurkey 2019 Peaches glyphosate 71 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
65Conyza sumatrensisSumatran Fleabane18164
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