International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP G/9 RESISTANT RAGWEED PARTHENIUM
(Parthenium hysterophorus)


EPSP synthase inhibitors (G/9)

Colombia, Cauca
INTRODUCTION RAGWEED PARTHENIUM
Ragweed Parthenium (Parthenium hysterophorus) is a dicot weed in the Asteraceae family.  In Colombia this weed first evolved resistance to Group G/9 herbicides in 2004 and infests Fruit.   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 May 22, 2009 )

Common NameRagweed Parthenium
SpeciesParthenium hysterophorus
GroupEPSP synthase inhibitors (G/9)
Herbicidesglyphosate
LocationColombia, Cauca
Year2004
Situation(s)Fruit
Contributors - (Alphabetically)Cilia Fuentes, and Jesus Ma. Rosario Soccorro 
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ACADEMIC ASPECTS

Confirmation Tests

Field, Greenhouse, and Laboratory trials comparing a known susceptible Ragweed Parthenium biotype with this Ragweed Parthenium 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 Ragweed Parthenium 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

Studies on the mechanism of resistance of Group G/9 resistant Ragweed Parthenium from Colombia indicate that resistance is due to altered translocation.  There may be a note below or an article discussing the mechanism of resistance in the Fact Sheets and Other Literature
 
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 Ragweed Parthenium from Colombia please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

CILIA FUENTES
Associate Professor
National University Of Colombia
Depart. Of Agronomy
141 Experiment Station Rd
Bogotá D.c., ----
Colombia
Email Cilia Fuentes
Web   : Web Site Link
JESUS MA. ROSARIO SOCCORRO
Associate Researcher
Córdoba University
Agricultural Chemistry And Edafology
Campus De Rabanales
Córdoba, ----, Andalucía Region
Spain
Email Jesus Ma. Rosario Soccorro
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 Cilia Fuentes, and Jesus Ma. Rosario Soccorro for providing detailed information.
Herbicide Resistant Ragweed Parthenium Globally
(Parthenium hysterophorus)
Herbicide Resistant Ragweed Parthenium Globally
(Parthenium hysterophorus)
Drag a column header and drop it here to group by that column
Herbicide Resistant Ragweed Parthenium Globally
(Parthenium hysterophorus)
#CountryFirstYearSituationActive IngredientsSite of Action
1 BrazilBrazil 2004 Soybean chlorimuron-ethyl, cloransulam-methyl, foramsulfuron, imazethapyr, and iodosulfuron-methyl-sodium 5 ALS inhibitors (B/2)
124Parthenium hysterophorusRagweed Parthenium5238
2 ColombiaColombia 2004 Fruit glyphosate 10 EPSP synthase inhibitors (G/9)
124Parthenium hysterophorusRagweed Parthenium5380
3 United States (Florida) United StatesFlorida2014 Fallow, Industrial sites, Railways, and Roadsides glyphosate 45 EPSP synthase inhibitors (G/9)
124Parthenium hysterophorusRagweed Parthenium11003
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Monday, August 21, 2017 .  Available  www.weedscience.org
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