International Survey of Herbicide-Resistant Weeds

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GROUP G/9 RESISTANT SUMATRAN FLEABANE
(Conyza sumatrensis)


EPSP synthase inhibitors (G/9)

Greece
INTRODUCTION SUMATRAN FLEABANE
Sumatran Fleabane (Conyza sumatrensis) is a dicot weed in the Asteraceae family.  In Greece this weed first evolved resistance to Group G/9 herbicides in 2012 and infests Grapes, Olive, and 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 Oct 19, 2016 )

Common NameSumatran Fleabane
SpeciesConyza sumatrensis
GroupEPSP synthase inhibitors (G/9)
Herbicidesglyphosate
LocationGreece
Year2012
Situation(s)Grapes, Olive, and Orchards
Contributors - (Alphabetically)Demos Chachalis, Ilias Eleftherohorinos, and Ilias Travlos 
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NOTES ABOUT THIS BIOTYPE

GENERAL

Ilias Eleftherohorinos

Glyphosate resistance of molecularly identified Conyza albida and Conyza bonariensis populations.

Philippos N. Mylonas , Costas N. Giannopolitis, Panagiotis G. Efthimiadis, Giorgos C. Menexes, Panagiotis B. Madesis, Ilias G. Eleftherohorinos

Crop Protection 65 (2014) 207-215

In the initial screening, 18 out of 32 Conyza albida and 7 out of 28 Conyza bonariensis populations, sampled from main perennial crop regions of central and southern Greece, were found to be resistant to glyphosate. The level of resistance determined in dose—response experiments with representative populations of the two species was found to range from 7.7 to 37.3 for C. albida and from 3.4 to 7.8 for C. bonariensis. The comparison of the resistant and susceptible C. albida and C. bonariensis EPSPS gene sequences indicated that possess single nucleotide changes compared to Conyza canadensis EPSPS gene, but none of these changes is located at the position 106 that has been reported to confer resistance to glyphosate. Finally, the cpDNA sequence comparison analysis used for the most resistant population of each species and the respective susceptible counterparts was found to be a reliable tool for discrimi­nation of conventionally classified C. albida and C. bonariensis plants that are morphologically similar. This is the first report for molecular identification of Conyza species.

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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

Studies on the mechanism of resistance of Group G/9 resistant Sumatran Fleabane from Greece indicate that resistance is due to an altered target site.  There may be a note below or an article discussing the mechanism of resistance in the Fact Sheets and Other Literature
 
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 Greece please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

DEMOS CHACHALIS
Weed Science Researcher
Benaki Phytopathological Institute
Laboratory of Chemical Weed Management
37 First Avenue
Athens, 145 61
Greece
Email Demos Chachalis
Web   : Web Site Link
ILIAS ELEFTHEROHORINOS
Weed Science Researcher
University Of Thessaloniki
Laboratory Of Agronomy
4033 Kensington Pl
Ghessaloniki, 54006
Greece
Email Ilias Eleftherohorinos
Web   : Web Site Link
ILIAS TRAVLOS
Lecturer
Agricultural University Of Athens
Laboratory Of Agronomy
Faculty Of Crop Science
75, Iera Odos Str.
Athens, GR11855
Greece
Email Ilias Travlos
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Greece have been instrumental in providing you this information. Particular thanks is given to Demos Chachalis, Ilias Eleftherohorinos, and Ilias Travlos 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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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Thursday, October 19, 2017 .  Available  www.weedscience.org
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