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)

Colombia, Caldas
INTRODUCTION HAIRY FLEABANE
Hairy Fleabane (Conyza bonariensis) is a dicot weed in the Asteraceae family.  In Colombia this weed first evolved resistance to Group 9 (Legacy G) herbicides in 2006 and infests Coffee.   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 Feb 11, 2010 )

Common NameHairy Fleabane
SpeciesConyza bonariensis
GroupInhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
Herbicidesglyphosate
LocationColombia, Caldas
Year2006
Situation(s)Coffee
Contributors - (Alphabetically)Hernán Darío Menza Franco, and Luis Fernando Salazar-Gutiérrez 
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NOTES ABOUT THIS BIOTYPE

DOSE RESPONSE

Luis Fernando Salazar-Gutiérrez
Due to reports of farmers and field observations about Conyza bonariensis glyphosate control failure in several crops, was carried out an experiment to determinate the resistance of this weed to the herbicide. Seeds of C. bonariensis were collected in four farms of Colombia, three of them characterized by high frequency of glyphosate application during the previous 10 years, located in the municipalities of Chinchiná and Palestina, Caldas (biotypes A, B and C) and the other one without influence of herbicides during the previous 20 years, that was taken as point of reference, located in the municipality of Los Santos, Santander (biotype D). Were used two methodologies: seeds in Petri dishes, and pot dose – response experiment in greenhouse condition, were used different glyphosate concentrations (0 to 144 mg a.e 5 cm-3 water) and doses (0 to 5.760 g a.e. ha-1) of the herbicide respectively. In both tests an experimental design completely random with 10 repetitions was carried out. In both methodologies, the biotype D, showed higher values of weed control than the biotypes A, B and C. However the methodology of pot dose – response showed more relevant results, the biotype D reached values highest than 90 % of control with a glyphosate dose of 480 g i.a.ha-1, while the biotypes A, B y C required 2.880 g i.a.ha-1 to reach the same values of control. Using the commercial dose (1.440 g i.a.ha-1) on the biotypes A, B and C, it did not reach values of control highest than 60%. The results confirmed that the biotype A, B and C were resistant to glyphosate, due to statistical differences (Tukey 5%) of them with the biotype D.

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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 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 Colombia please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

HERNÁN DARÍO MENZA FRANCO
Ingeniero Agrónomo
Universidad Nacional De Colombia
Agronomia
Horticulture& Landscape Arch
625 Agriculture Mall,
Palmira, Valle
Colombia
Email Hernán Darío Menza Franco
LUIS FERNANDO SALAZAR-GUTIÉRREZ
Agronomyst Eng. Researcher. Ph.D.
National Center For Coffee Research (Cenicafé)
Depatment Of Soil
Planalto, km 4
Vía antigua Chinchiná-Manizales Manizales (Caldas) Colombia
Manizales, 170009, Caldas
Colombia
Email Luis Fernando Salazar-Gutiérrez
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Colombia have been instrumental in providing you this information. Particular thanks is given to Hernán Darío Menza Franco, and Luis Fernando Salazar-Gutiérrez 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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