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)

Brazil, Rio Grande do Sul, Sao Paulo
INTRODUCTION HAIRY FLEABANE
Hairy Fleabane (Conyza bonariensis) is a dicot weed in the Asteraceae family.  In Brazil this weed first evolved resistance to Group G/9 herbicides in 2005 and infests Corn (maize), Fruit, Soybean, and Wheat.   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 02, 2008 )

Common NameHairy Fleabane
SpeciesConyza bonariensis
GroupEPSP synthase inhibitors (G/9)
Herbicidesglyphosate
LocationBrazil, Rio Grande do Sul, Sao Paulo
Year2005
Situation(s)Corn (maize), Fruit, Soybean, and Wheat
Contributors - (Alphabetically)Mario Antonio Bianchi, Pedro Christoffoleti, Antonio Galli, Murilo Moreira, Marcelo Nicolai, Mauro Rizzardi, Erivelton Scherer Roman, and Leandro Vargas 
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ACADEMIC ASPECTS

Confirmation Tests

Field, and 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 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 Brazil please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

MARIO ANTONIO BIANCHI
Research - Weed Science
Fundacep Fecotrigo
3503 6th Street East
Cruz Alta, 10
Brazil
Email Mario Antonio Bianchi
PEDRO CHRISTOFFOLETI
Associate Professor III
Universidade de Sao Paulo
Crop Science Department
ESALQ - USP - LPV - Av. Padua Dias 11 - C. Postal 09
Piracicaba, 13418-900, São Paulo
Brazil
Email Pedro Christoffoleti
Web   : Web Site Link
ANTONIO GALLI
Crop Chemical Manager
Monsanto
Technology Development
1211 Pinecrest Dr.
Ribeirao Preto, 14021-520, São Paulo
Brazil
Email Antonio Galli
Web   : Web Site Link
MURILO MOREIRA
Graduate Student - Msc
University Of Sao Paulo
Crop Science
Jk Suha Reka Block 209a
pp.20,floor 8
Piracicaba, 13418-900, São Paulo
Brazil
Email Murilo Moreira
Web   : Web Site Link
MARCELO NICOLAI
Graduate Student Phd
University Of Sao Paulo
Crop Science
A438 Plant& Soil Science Building
Department Of Horticulture,
Piracicaba, 13418-900, São Paulo
Brazil
Email Marcelo Nicolai
Web   : Web Site Link
MAURO RIZZARDI
Professor
Universidade De Passo Fundo
Crop Science
3713 Whispering Lane
Passo Fundo, 99010110, Rio Grande Do Sul
Brazil
Email Mauro Rizzardi
Web   : Web Site Link
ERIVELTON SCHERER ROMAN
Weed Scientist
Brazilian Agricultural Research Organization
Weed Science
7633 Breckenridge Ln
Passo Fundo, 99001-970, RS
Brazil
Email Erivelton Scherer Roman
Web   : Web Site Link
LEANDRO VARGAS
Weed Scientist
Embrapa Trigo
Weed Science
Horticultural Science
Campus Box 7609, 262 Kilgore Hall
Passo Fundo - Rs, 99001-970, RS
Brazil
Email Leandro Vargas
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Brazil have been instrumental in providing you this information. Particular thanks is given to Mario Antonio Bianchi, Pedro Christoffoleti, Antonio Galli, Murilo Moreira, Marcelo Nicolai, Mauro Rizzardi, Erivelton Scherer Roman, and Leandro Vargas 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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