International Survey of Herbicide-Resistant Weeds

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


EPSP synthase inhibitors (G/9)

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 G/9 herbicides in 2006 and infests Coffee.   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 Feb 11, 2010 )

Common NameHairy Fleabane
SpeciesConyza bonariensis
GroupEPSP synthase inhibitors (G/9)
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 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

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 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. Research Assistant
National Center For Coffee Research (cenicafé)
Depatment Of Agronomy
Marketing
Chinchiná, 2427, 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 Australia (New South Wales ) AustraliaNew South Wales 2010 Industrial sites, and Roadsides glyphosate 1 EPSP synthase inhibitors (G/9)
60Conyza bonariensisHairy Fleabane5512
2 Australia (Queensland) AustraliaQueensland2011 Roadsides glyphosate 1 EPSP synthase inhibitors (G/9)
60Conyza bonariensisHairy Fleabane5604
3 Australia (South Australia) AustraliaSouth Australia2011 Roadsides glyphosate 1 EPSP synthase inhibitors (G/9)
60Conyza bonariensisHairy Fleabane5605
4 Australia (New South Wales ) AustraliaNew South Wales 2016 Grapes paraquat 1 PSI Electron Diverter (D/22)
60Conyza bonariensisHairy Fleabane13045
5 BrazilBrazil 2005 Corn (maize), Fruit, Soybean, and Wheat glyphosate 5 EPSP synthase inhibitors (G/9)
60Conyza bonariensisHairy Fleabane5264
6 ColombiaColombia 2006 Coffee glyphosate 10 EPSP synthase inhibitors (G/9)
60Conyza bonariensisHairy Fleabane5295
7 EgyptEgypt 1989 Unspecified paraquat 15 PSI Electron Diverter (D/22)
60Conyza bonariensisHairy Fleabane383
8 GreeceGreece 2010 Grapes, Olive, and Orchards glyphosate 19 EPSP synthase inhibitors (G/9)
60Conyza bonariensisHairy Fleabane5590
9 IsraelIsrael 1993 Forests, and Industrial sites atrazine, and simazine 23 Photosystem II inhibitors (C1/5)
60Conyza bonariensisHairy Fleabane102
10 IsraelIsrael 1993 Forests, and Industrial sites chlorsulfuron 23 ALS inhibitors (B/2)
60Conyza bonariensisHairy Fleabane103
11 IsraelIsrael 2005 Roadsides glyphosate 23 EPSP synthase inhibitors (G/9)
60Conyza bonariensisHairy Fleabane5464
12 JapanJapan 1989 Roadsides diquat, and paraquat 25 PSI Electron Diverter (D/22)
60Conyza bonariensisHairy Fleabane128
13 PortugalPortugal 2010 Orchards glyphosate 34 EPSP synthase inhibitors (G/9)
60Conyza bonariensisHairy Fleabane5539
14 South AfricaSouth Africa 2003 Grapes, and Orchards paraquat 37 PSI Electron Diverter (D/22)
60Conyza bonariensisHairy Fleabane5191
15 South AfricaSouth Africa 2003 Grapes, and Orchards glyphosate 37 EPSP synthase inhibitors (G/9)
60Conyza bonariensisHairy Fleabane5192
16 SpainSpain 1987 Orchards simazine 38 Photosystem II inhibitors (C1/5)
60Conyza bonariensisHairy Fleabane181
17 SpainSpain 2004 Orchards glyphosate 38 EPSP synthase inhibitors (G/9)
60Conyza bonariensisHairy Fleabane5223
18 United States (California) United StatesCalifornia2007 Roadsides glyphosate 45 EPSP synthase inhibitors (G/9)
60Conyza bonariensisHairy Fleabane5310
19 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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