International Survey of Herbicide-Resistant Weeds

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GROUP G/9 RESISTANT SUMATRAN FLEABANE
(Conyza sumatrensis)


EPSP synthase inhibitors (G/9)

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 G/9 herbicides in 2010 and infests Corn (maize), and Soybean.   Group G/9 herbicides are known as EPSP synthase inhibitors (Inhibition of EPSP synthase).  Research has shown that these particular biotypes are resistant to glyphosate and they may be cross-resistant to other Group G/9 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
GroupEPSP synthase inhibitors (G/9)
Herbicidesglyphosate
LocationBrazil, Paraná
Year2010
Situation(s)Corn (maize), and Soybean
Contributors - (Alphabetically)Jamil Constantin, Rubem Oliveira, Gisela Sancho, Gizelly Santos, and Michelangelo Trezzi 
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NOTES ABOUT THIS BIOTYPE

DOSE RESPONSE

Michelangelo Trezzi
Twelve Conyza biotypes with suspected resistance to glyphosate were collected in soybean crop areas of West and Southwest regions of Parana State, Brazil.After the taxonomic study, it was concluded that six of them were Conyza sumatrensis.Dose-response curves to glyphosate of the six biotypes carry out in greenhouse determined resistance factors ranging from 5 to 37.The resistance factors varied according to biotype and variable evaluated.

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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 Group G/9 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 G/9 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
GISELA SANCHO
Associate Professor
Universidade Estadual De Maringá - Departamento De Agronomia
División Plantas Vasculares
Museo De La Plata
Paseo Del Bosque S.n.
Buenos Aires, 1900, La Plata
Argentina
Email Gisela Sancho
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
MICHELANGELO TREZZI
Professor Of Agronomy School
Agronomy School Utfpr, Campus Pato Branco
Depart. Of Crop Science
Stine-haskell Research Station
Pato Branco, 85503-390, Paraná
Brazil
Email Michelangelo Trezzi
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, Gisela Sancho, Gizelly Santos, and Michelangelo Trezzi 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 BrazilBrazil 2010 Corn (maize), and Soybean glyphosate 5 EPSP synthase inhibitors (G/9)
65Conyza sumatrensisSumatran Fleabane5577
2 BrazilBrazil 2011 Soybean chlorimuron-ethyl 5 ALS inhibitors (B/2)
65Conyza sumatrensisSumatran Fleabane5647
3 BrazilBrazil 2011 Corn (maize), and Soybean chlorimuron-ethyl, and glyphosate 5 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
EPSP synthase inhibitors (G/9)
65Conyza sumatrensisSumatran Fleabane5648
4 BrazilBrazil 2016 Soybean paraquat 5 PSI Electron Diverter (D/22)
65Conyza sumatrensisSumatran Fleabane16082
5 BrazilBrazil 2017 Soybean saflufenacil 5 PPO inhibitors (E/14)
65Conyza sumatrensisSumatran Fleabane17099
6 BrazilBrazil 2017 Soybean chlorimuron-ethyl, glyphosate, and paraquat 5 Multiple Resistance: 3 Sites of Action
ALS inhibitors (B/2)
PSI Electron Diverter (D/22)
EPSP synthase inhibitors (G/9)
65Conyza sumatrensisSumatran Fleabane17102
7 FranceFrance 2010 Grapes glyphosate 17 EPSP synthase inhibitors (G/9)
65Conyza sumatrensisSumatran Fleabane9932
8 GreeceGreece 2012 Grapes, Olive, and Orchards glyphosate 19 EPSP synthase inhibitors (G/9)
65Conyza sumatrensisSumatran Fleabane5691
9 JapanJapan 1986 Mulberry, Orchards, and Roadsides diquat, and paraquat 25 PSI Electron Diverter (D/22)
65Conyza sumatrensisSumatran Fleabane126
10 MalaysiaMalaysia 1990 Vegetables paraquat 28 PSI Electron Diverter (D/22)
65Conyza sumatrensisSumatran Fleabane138
11 SpainSpain 2009 Orchards glyphosate 38 EPSP synthase inhibitors (G/9)
65Conyza sumatrensisSumatran Fleabane5481
12 Sri LankaSri Lanka 1998 Tea paraquat 39 PSI Electron Diverter (D/22)
65Conyza sumatrensisSumatran Fleabane1184
13 TaiwanTaiwan 1980 Cropland, Railways, and Roadsides paraquat 42 PSI Electron Diverter (D/22)
65Conyza sumatrensisSumatran Fleabane214
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