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)

United States, California
INTRODUCTION HAIRY FLEABANE
Hairy Fleabane (Conyza bonariensis) is a dicot weed in the Asteraceae family.  In United States this weed first evolved resistance to Group G/9 herbicides in 2007 and infests Roadsides.   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 Jan 03, 2014 )

Common NameHairy Fleabane
SpeciesConyza bonariensis
GroupEPSP synthase inhibitors (G/9)
Herbicidesglyphosate
LocationUnited States
Year2007
Situation(s)Roadsides
Contributors - (Alphabetically)Brad Hanson, Kurt Hembree, Marcelo L. Moretti, and Anil Shrestha 
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NOTES ABOUT THIS BIOTYPE

GENERAL

Anil Shrestha
A greenhouse experiment was conducted in April-August, 2007 at the University of California, Kearney Agricultural Center, Parlier, CA. The experiment was conducted by Anil Shrestha, UCIPM, Parlier; Brad Hanson, USDA-ARS, Parlier; and Kurt Hembree, UCCE, Fresno. The experiment was a completely randomized design with five replications. The experiment was repeated. Seeds of Conyza bonariensis were collected from Fresno, Davis, and Reedley, CA. Plants grown from these seeds were subjected to 0, 0.22, 0.43, 0.87, 1.74, 3.47, 6.94, and 13.89 kg ae/ha of glyphosate (Roundup Weathermax) at the 8-15 leaf stage (experiment 1) and 18-25 leaf stage (experiment 2). The plants from Fresno and Davis did not survive the 0.87 kg ae/ha or higher doses whereas, the plants from Reedley survived up to the 6.94 kg ae/ha dose. A couple of plants from Reedley even survived the 13.89 kg ae/ha dose. Evaluations were taken 14 days after spraying and a plant was considered dead if it had no green tissue remaining. Dry mass data was also taken. A full report on this study will be available soon.

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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 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 United States please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

BRAD HANSON
Cooperative Extension Weed Specialist
University Of California, Davis
Department Of Plant Sciences
MS-4, One Shields Ave
276 Robbins Hall
Davis, 91616, California
United States
Email Brad Hanson
Web   : Web Site Link
KURT HEMBREE
Weed Management Farm Advisor
University Of California Cooperative Extension
Agriculture and Natural Resources
550 E. Shaw Avenue
Suite 210
Fresno, 93702, California
United States
Email Kurt Hembree
Web   : Web Site Link
MARCELO L. MORETTI
PhD candidate
University of California - Davis
Plant Sciences
One Shields Ave
Davis, 95616, California
United States
Email Marcelo L. Moretti
Web   : Web Site Link
ANIL SHRESTHA
Professor - Weed Science
California State University
Dept. Of Plant Science
2415 E San Ramon Ave. M/S AS72
Fresno, 93740, California
United States
Email Anil Shrestha
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in United States have been instrumental in providing you this information. Particular thanks is given to Brad Hanson, Kurt Hembree, Marcelo L. Moretti, and Anil Shrestha 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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