International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP G/9 RESISTANT SUMATRAN FLEABANE
(Conyza sumatrensis)


EPSP synthase inhibitors (G/9)

Spain, Huelva
INTRODUCTION SUMATRAN FLEABANE
Sumatran Fleabane (Conyza sumatrensis) is a dicot weed in the Asteraceae family.  In Spain this weed first evolved resistance to Group G/9 herbicides in 2009 and infests Orchards.   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 Mar 17, 2010 )

Common NameSumatran Fleabane
SpeciesConyza sumatrensis
GroupEPSP synthase inhibitors (G/9)
Herbicidesglyphosate
LocationSpain, Huelva
Year2009
Situation(s)Orchards
Contributors - (Alphabetically)Rafael De Prado, and Fidel González-Torralva 
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ACADEMIC ASPECTS

Confirmation Tests

Field, Greenhouse, and Laboratory 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 Spain please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

RAFAEL DE PRADO
Universidad De Cordoba
Qvimica Agricola Y Edafologa
E T S Ingenieros Agronomos
PO Box 119
Cordoba, E-14080, Andalusia
Spain
Email Rafael De Prado
FIDEL GONZÁLEZ-TORRALVA
Ph D
University of Cordoba
Agricultural Chemistry and Soil Sciences
Ctra. Nac. IV Km 396 Edif. C-3 Marie Curie
Cordoba, 14071, Andalusia
Spain
Email Fidel González-Torralva

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Spain have been instrumental in providing you this information. Particular thanks is given to Rafael De Prado, and Fidel González-Torralva 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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