International Survey of Herbicide-Resistant Weeds

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GROUP G/9 RESISTANT HAIRY FLEABANE
(Conyza bonariensis)


EPSP synthase inhibitors (G/9)

Greece
INTRODUCTION HAIRY FLEABANE
Hairy Fleabane (Conyza bonariensis) is a dicot weed in the Asteraceae family.  In Greece this weed first evolved resistance to Group G/9 herbicides in 2010 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 NameHairy Fleabane
SpeciesConyza bonariensis
GroupEPSP synthase inhibitors (G/9)
Herbicidesglyphosate
LocationGreece
Year2010
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 EPSPSgene, 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

Greenhouse, and Laboratory trials comparing a known susceptible Hairy Fleabane biotype with this Hairy 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 Hairy 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 Hairy 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 Hairy 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 Hairy Fleabane Globally
(Conyza bonariensis)
Herbicide Resistant Hairy Fleabane Globally
(Conyza bonariensis)
Drag a column header and drop it here to group by that column
Herbicide Resistant Hairy Fleabane Globally
(Conyza bonariensis)
#CountryFirstYearSituationActive IngredientsSite of Action
1 ArgentinaArgentina 2012 Soybean glyphosate 48 EPSP synthase inhibitors (G/9)
60Conyza bonariensisHairy Fleabane17100
2 Australia (New South Wales ) AustraliaNew South Wales 2010 Industrial sites, and Roadsides glyphosate 1 EPSP synthase inhibitors (G/9)
60Conyza bonariensisHairy Fleabane5512
3 Australia (Queensland) AustraliaQueensland2011 Roadsides glyphosate 1 EPSP synthase inhibitors (G/9)
60Conyza bonariensisHairy Fleabane5604
4 Australia (South Australia) AustraliaSouth Australia2011 Roadsides glyphosate 1 EPSP synthase inhibitors (G/9)
60Conyza bonariensisHairy Fleabane5605
5 Australia (New South Wales ) AustraliaNew South Wales 2016 Grapes paraquat 1 PSI Electron Diverter (D/22)
60Conyza bonariensisHairy Fleabane13045
6 BrazilBrazil 2005 Corn (maize), Fruit, Soybean, and Wheat glyphosate 5 EPSP synthase inhibitors (G/9)
60Conyza bonariensisHairy Fleabane5264
7 ColombiaColombia 2006 Coffee glyphosate 10 EPSP synthase inhibitors (G/9)
60Conyza bonariensisHairy Fleabane5295
8 EgyptEgypt 1989 Unspecified paraquat 15 PSI Electron Diverter (D/22)
60Conyza bonariensisHairy Fleabane383
9 GreeceGreece 2010 Grapes, Olive, and Orchards glyphosate 19 EPSP synthase inhibitors (G/9)
60Conyza bonariensisHairy Fleabane5590
10 IsraelIsrael 1993 Forests, and Industrial sites atrazine, and simazine 23 Photosystem II inhibitors (C1/5)
60Conyza bonariensisHairy Fleabane102
11 IsraelIsrael 1993 Forests, and Industrial sites chlorsulfuron 23 ALS inhibitors (B/2)
60Conyza bonariensisHairy Fleabane103
12 IsraelIsrael 2005 Roadsides glyphosate 23 EPSP synthase inhibitors (G/9)
60Conyza bonariensisHairy Fleabane5464
13 JapanJapan 1989 Roadsides diquat, and paraquat 25 PSI Electron Diverter (D/22)
60Conyza bonariensisHairy Fleabane128
14 PortugalPortugal 2010 Orchards glyphosate 34 EPSP synthase inhibitors (G/9)
60Conyza bonariensisHairy Fleabane5539
15 South AfricaSouth Africa 2003 Grapes, and Orchards paraquat 37 PSI Electron Diverter (D/22)
60Conyza bonariensisHairy Fleabane5191
16 South AfricaSouth Africa 2003 Grapes, and Orchards glyphosate 37 EPSP synthase inhibitors (G/9)
60Conyza bonariensisHairy Fleabane5192
17 SpainSpain 1987 Orchards simazine 38 Photosystem II inhibitors (C1/5)
60Conyza bonariensisHairy Fleabane181
18 SpainSpain 2004 Orchards glyphosate 38 EPSP synthase inhibitors (G/9)
60Conyza bonariensisHairy Fleabane5223
19 United States (California) United StatesCalifornia2007 Roadsides glyphosate 45 EPSP synthase inhibitors (G/9)
60Conyza bonariensisHairy Fleabane5310
20 United States (California) United StatesCalifornia2009 Corn (maize), Grapes, Orchards, and Roadsides glyphosate, and paraquat 45 Multiple Resistance: 2 Sites of Action
PSI Electron Diverter (D/22)
EPSP synthase inhibitors (G/9)
60Conyza bonariensisHairy Fleabane5390
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