International Survey of Herbicide-Resistant Weeds

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HRAC GROUP 9 (LEGACY G) RESISTANT HAIRY FLEABANE
(Conyza bonariensis)


Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)

Argentina, Zavalla, Santa Fe
INTRODUCTION HAIRY FLEABANE
Hairy Fleabane (Conyza bonariensis) is a dicot weed in the Asteraceae family.  In Argentina this weed first evolved resistance to Group 9 (Legacy G) herbicides in 2012 and infests Soybean.   Group 9 (Legacy G) herbicides are known as Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (Inhibition of EPSP synthase).  Research has shown that these particular biotypes are resistant to glyphosate and they may be cross-resistant to other Group 9 (Legacy G) 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 Aug 27, 2017 )

Common NameHairy Fleabane
SpeciesConyza bonariensis
GroupInhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
Herbicidesglyphosate
LocationArgentina, Zavalla, Santa Fe
Year2012
Situation(s)Soybean
Contributors - (Alphabetically)Eduardo Puricelli 
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NOTES ABOUT THIS BIOTYPE

GENERAL

Eduardo Puricelli
Differential Susceptibility of Conyza  bonariensis Biotypes to Glyphosate and ALS-Inhibiting Herbicides in Argentina Eduardo Puricelli1*, Delma Faccini1, Marcelo Metzler2, Patricia Torres1
  • 1Facultad de Ciencias Agrarias and Consejo de Investigaciones, Universidad Nacional de Rosario, Rosario, Argentina
  • 2INTA Paraná, Paraná, Argentina

Email: *ed.puricelli@gmail.com

Abstract The aim of this study was to compare control of three stages biotypes (rosette, bolting, and repro- ductive stage) of Conyza bonariensis glyphosate susceptible biotype (S) and tolerant biotype (T) to glyphosate with glyphosate and mixtures of acetolactate synthase (ALS)-inhibiting. For glyphosate, the dose-response curves confirmed that injury of the biotype T relative to biotype S was signifi- cantly lower for both rosette and bolting stages. Resistance index (RI) for this herbicide was approximately 4 for both weed stages. At bolting, for both biotypes doses much higher than the recommended dose were required. For acetolactate synthase (ALS)-inhibiting herbicides, at the rosette stage, control of both biotypes was excellent with doses significantly lower than the recommended rate. All herbicides within this group showed a very low I50 relative to the recommended rate. These results indicate that biotypes difficult to control with glyphosate at the rosette and bolting stage may be controlled using acetolacte synthase (ALS)-inhibiting herbicides. Control for the reproductive stage was poor. A management program based on the combination of glyphosate with pre- and post-emergence acetolactate synthase (ALS) herbicides may be effective to control the weed. 

 

Agricultural Sciences, 2015, 6, 22-30 Published Online January 2015 in SciRes. http://www.scirp.org/journal/as http://dx.doi.org/10.4236/as.2015.61003   

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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse 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 HRAC Group 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

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 9 (Legacy G) resistant Hairy Fleabane from Argentina please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

EDUARDO PURICELLI
Professor
University of Rosario
Crop Protection
Campo Villarino CC14 2125 Zavalla
Zavalla, 2125
Argentina
Email Eduardo Puricelli

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Argentina have been instrumental in providing you this information. Particular thanks is given to Eduardo Puricelli 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 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
60Conyza bonariensisHairy Fleabane17100
2 Australia (New South Wales ) AustraliaNew South Wales 2010 Industrial sites, and Roadsides glyphosate 1 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
60Conyza bonariensisHairy Fleabane5512
3 Australia (Queensland) AustraliaQueensland2011 Roadsides glyphosate 1 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
60Conyza bonariensisHairy Fleabane5604
4 Australia (South Australia) AustraliaSouth Australia2011 Roadsides glyphosate 1 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
60Conyza bonariensisHairy Fleabane5605
5 Australia (New South Wales ) AustraliaNew South Wales 2016 Grapes paraquat 1 PS I Electron Diversion ( HRAC Group 22 (Legacy D)
60Conyza bonariensisHairy Fleabane13045
6 BrazilBrazil 2005 Corn (maize), Fruit, Soybean, and Wheat glyphosate 5 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
60Conyza bonariensisHairy Fleabane5264
7 ColombiaColombia 2006 Coffee glyphosate 10 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
60Conyza bonariensisHairy Fleabane5295
8 EgyptEgypt 1989 Unspecified paraquat 15 PS I Electron Diversion ( HRAC Group 22 (Legacy D)
60Conyza bonariensisHairy Fleabane383
9 GreeceGreece 2010 Grapes, Olive, and Orchards glyphosate 19 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
60Conyza bonariensisHairy Fleabane5590
10 IsraelIsrael 1993 Forests, and Industrial sites atrazine, and simazine 23 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
60Conyza bonariensisHairy Fleabane102
11 IsraelIsrael 1993 Forests, and Industrial sites chlorsulfuron 23 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
60Conyza bonariensisHairy Fleabane103
12 IsraelIsrael 2005 Roadsides glyphosate 23 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
60Conyza bonariensisHairy Fleabane5464
13 JapanJapan 1989 Roadsides diquat, and paraquat 25 PS I Electron Diversion ( HRAC Group 22 (Legacy D)
60Conyza bonariensisHairy Fleabane128
14 JordanJordan 2022 Palm oil oxadiazon, oxyfluorfen, and paraquat 55 Multiple Resistance: 2 Sites of Action
PS I Electron Diversion ( HRAC Group 22 (Legacy D)
Inhibition of Protoporphyrinogen Oxidase ( HRAC Group 14 (Legacy E)
60Conyza bonariensisHairy Fleabane27269
15 PortugalPortugal 2010 Orchards glyphosate 34 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
60Conyza bonariensisHairy Fleabane5539
16 South AfricaSouth Africa 2003 Grapes, and Orchards paraquat 37 PS I Electron Diversion ( HRAC Group 22 (Legacy D)
60Conyza bonariensisHairy Fleabane5191
17 South AfricaSouth Africa 2003 Grapes, and Orchards glyphosate 37 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
60Conyza bonariensisHairy Fleabane5192
18 SpainSpain 1987 Orchards simazine 38 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
60Conyza bonariensisHairy Fleabane181
19 SpainSpain 2004 Orchards glyphosate 38 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
60Conyza bonariensisHairy Fleabane5223
20 SwitzerlandSwitzerland 2020 Grapes glyphosate 41 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
60Conyza bonariensisHairy Fleabane24247
21 United States (California) United StatesCalifornia2007 Roadsides glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
60Conyza bonariensisHairy Fleabane5310
22 United States (California) United StatesCalifornia2009 Corn (maize), Grapes, Orchards, and Roadsides glyphosate, and paraquat 45 Multiple Resistance: 2 Sites of Action
PS I Electron Diversion ( HRAC Group 22 (Legacy D)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
60Conyza bonariensisHairy Fleabane5390
23 United States (Oregon) United StatesOregon2023 Fallow, and Wheat glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G)
60Conyza bonariensisHairy Fleabane27285
24 UruguayUruguay 2022 Corn (maize), and Soybean chlorimuron-ethyl, diclosulam, and glyphosate 73 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)
60Conyza bonariensisHairy Fleabane27291
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