International Survey of Herbicide-Resistant Weeds

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


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

Spain, Sevilla, Cordoba, Huelva
INTRODUCTION HAIRY FLEABANE
Hairy Fleabane (Conyza bonariensis) is a dicot weed in the Asteraceae family.  In Spain this weed first evolved resistance to Group 9 (Legacy G) herbicides in 2004 and infests Orchards.   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 Jan 20, 2015 )

Common NameHairy Fleabane
SpeciesConyza bonariensis
GroupInhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
Herbicidesglyphosate
LocationSpain, Sevilla, Cordoba, Huelva
Year2004
Situation(s)Orchards
Contributors - (Alphabetically)Jose Maria Urbano 
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NOTES ABOUT THIS BIOTYPE

AREAS FOUND

Jose Maria Urbano
No-till olives orchards of Sevilla and Cordoba.

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BIOASSAYS

Jose Maria Urbano
A survey was made in 50 locations and Conyza bonariensis seed collected in december 2003. For each location, seed collected was planted in separated pots and plants were sprayed at rosette stage with 0,66 l/ha of glyphosate 36%. Fresh and dry biomass was scored 21 days after treatment. Significative differences were found when comparing the response of plants from different locations. The most resistant biotypes ussually corresponded with olives or oranges farms, with no-till and a historial of use of glyphosate, meanwhile the most sensitive biotypes corresponded to peaches farms with less use of glyphosate. The I50 determination revealed that the resistance factor was higher than 10 for the most resistant locations.

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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 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

Researchers have indicated that Group 9/G resistant Hairy Fleabane is ecologically less fit than normal susceptible Hairy Fleabane.  There may be a note below or an article discussing the fitness of this biotype in the Fact Sheets and Other Literature
 
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CONTRIBUTING WEED SCIENTISTS

JOSE MARIA URBANO
Professor
Universidad De Sevilla
Dpto. Ciencias Agroforestales
1102 E Fm 1294
Sevilla, 41013
Spain
Email Jose Maria Urbano

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Spain have been instrumental in providing you this information. Particular thanks is given to Jose Maria Urbano 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 (G/9)
60Conyza bonariensisHairy Fleabane17100
2 Australia (New South Wales ) AustraliaNew South Wales 2010 Industrial sites, and Roadsides glyphosate 1 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
60Conyza bonariensisHairy Fleabane5512
3 Australia (Queensland) AustraliaQueensland2011 Roadsides glyphosate 1 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
60Conyza bonariensisHairy Fleabane5604
4 Australia (South Australia) AustraliaSouth Australia2011 Roadsides glyphosate 1 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
60Conyza bonariensisHairy Fleabane5605
5 Australia (New South Wales ) AustraliaNew South Wales 2016 Grapes paraquat 1 PS I Electron Diversion (D/22)
60Conyza bonariensisHairy Fleabane13045
6 BrazilBrazil 2005 Corn (maize), Fruit, Soybean, and Wheat glyphosate 5 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
60Conyza bonariensisHairy Fleabane5264
7 ColombiaColombia 2006 Coffee glyphosate 10 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
60Conyza bonariensisHairy Fleabane5295
8 EgyptEgypt 1989 Unspecified paraquat 15 PS I Electron Diversion (D/22)
60Conyza bonariensisHairy Fleabane383
9 GreeceGreece 2010 Grapes, Olive, and Orchards glyphosate 19 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
60Conyza bonariensisHairy Fleabane5590
10 IsraelIsrael 1993 Forests, and Industrial sites atrazine, and simazine 23 PSII inhibitors - Serine 264 Binders (C1 C2/5)
60Conyza bonariensisHairy Fleabane102
11 IsraelIsrael 1993 Forests, and Industrial sites chlorsulfuron 23 Inhibition of Acetolactate Synthase (B/2)
60Conyza bonariensisHairy Fleabane103
12 IsraelIsrael 2005 Roadsides glyphosate 23 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
60Conyza bonariensisHairy Fleabane5464
13 JapanJapan 1989 Roadsides diquat, and paraquat 25 PS I Electron Diversion (D/22)
60Conyza bonariensisHairy Fleabane128
14 PortugalPortugal 2010 Orchards glyphosate 34 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
60Conyza bonariensisHairy Fleabane5539
15 South AfricaSouth Africa 2003 Grapes, and Orchards paraquat 37 PS I Electron Diversion (D/22)
60Conyza bonariensisHairy Fleabane5191
16 South AfricaSouth Africa 2003 Grapes, and Orchards glyphosate 37 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
60Conyza bonariensisHairy Fleabane5192
17 SpainSpain 1987 Orchards simazine 38 PSII inhibitors - Serine 264 Binders (C1 C2/5)
60Conyza bonariensisHairy Fleabane181
18 SpainSpain 2004 Orchards glyphosate 38 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
60Conyza bonariensisHairy Fleabane5223
19 United States (California) United StatesCalifornia2007 Roadsides glyphosate 45 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (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
PS I Electron Diversion (D/22)
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
60Conyza bonariensisHairy Fleabane5390
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