INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

INTRODUCTION RAGWEED PARTHENIUM
Ragweed Parthenium (Parthenium hysterophorus) is a dicot weed in the Asteraceae family.  In Mexico this weed first evolved resistance to Group G/9 herbicides in 2017 and infests Oranges.   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 Jun 22, 2020 )

Common NameRagweed Parthenium
SpeciesParthenium hysterophorus
GroupEPSP synthase inhibitors (G/9)
Herbicidesglyphosate
LocationMexico, Martinez de la Torre
Year2017
Situation(s)Oranges
Contributors - (Alphabetically)Hugo Cruz-Hipólito, Rafael De Prado, and Ja Dominguez Valenzuela 
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ACADEMIC ASPECTS

Confirmation Tests

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 Mexico indicate that resistance is due to an altered target site.  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 Mexico please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

HUGO CRUZ-HIPÓLITO
Research Asociate
Universidad De Córdoba
Química Agrícola Y Edafología
Campus Universitario De Rabanales Edif. C-3 3ª Planta
Córdoba, 14002
Spain
Email Hugo Cruz-Hipólito
RAFAEL DE PRADO
Research Asociate
Universidad De Cordoba
Qvimica Agricola Y Edafologa
E T S Ingenieros Agronomos
PO Box 119
Cordoba, E-14080, Andalusia
Spain
Email Rafael De Prado
JA DOMINGUEZ VALENZUELA
Phd
Universidad Autónoma Chapingo
Parasitología Agrícola
Area De Malezas Departamento De Parasitología Agricola
Texcoco, 56230, Andalusia
Mexico
Email Ja Dominguez Valenzuela

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Mexico have been instrumental in providing you this information. Particular thanks is given to Hugo Cruz-Hipólito, Rafael De Prado, and Ja Dominguez Valenzuela 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 MexicoMexico 2017 Oranges glyphosate 29 EPSP synthase inhibitors (G/9)
124Parthenium hysterophorusRagweed Parthenium18196
4 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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PERMISSION MUST BE OBTAINED FIRST if you intend to base a significant portion of a scientific paper on data derived from this site. Citation:
Heap, I.  The International Herbicide-Resistant Weed Database.  Online.  Friday, September 18, 2020 .  Available  www.weedscience.org Copyright © 1993- 2020 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.