International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
HRAC GROUP 9 (LEGACY G) RESISTANT SALTMARSH ASTER
(Aster squamatus)


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

Mexico
INTRODUCTION SALTMARSH ASTER
Saltmarsh Aster (Aster squamatus) is a dicot weed in the Asteraceae family.  In Mexico this weed first evolved resistance to Group 9 (Legacy G) herbicides in 2021 and infests Oranges.   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 Sep 27, 2021 )

Common NameSaltmarsh Aster
SpeciesAster squamatus
GroupInhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
Herbicidesglyphosate
LocationMexico
Year2021
Situation(s)Oranges
Contributors - (Alphabetically)Hugo Cruz-Hipólito, Rafael De Prado, Ja Dominguez Valenzuela, Candelario Palma-Bautista, and José G. Vázquez-García 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible Saltmarsh Aster biotype with this Saltmarsh Aster 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 Saltmarsh Aster 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 9 (Legacy G) resistant Saltmarsh Aster from Mexico indicate that resistance is due to enhanced metabolism, and 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 9 (Legacy G) resistant Saltmarsh Aster 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
CANDELARIO PALMA-BAUTISTA
Research Associate
University of Cordoba
Department of Agricultural Chemistry and Edaphology
Rabanales University Campus
Building C-3 3rd Floor
Cordoba, 14071, Cordoba
Spain
Email Candelario Palma-Bautista
JOSÉ G. VÁZQUEZ-GARCÍA
Research Associate
University of Cordoba
Agricultural Chemistry and Edaphology
Campus of Rabanales
Cordoba, 14071, Province
Spain
Email José G. Vázquez-García

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, Ja Dominguez Valenzuela, Candelario Palma-Bautista, and José G. Vázquez-García for providing detailed information.
Herbicide Resistant Saltmarsh Aster Globally
(Aster squamatus)
Herbicide Resistant Saltmarsh Aster Globally
(Aster squamatus)
Drag a column header and drop it here to group by that column
Herbicide Resistant Saltmarsh Aster Globally
(Aster squamatus)
#CountryFirstYearSituationActive IngredientsSite of Action
1 MexicoMexico 2021 Oranges glyphosate 29 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
353Aster squamatusSaltmarsh Aster21229
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Sunday, November 28, 2021 .  Available  www.weedscience.org
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