International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP G/9 RESISTANT TROPICAL SPRANGLETOP (JUDDSGRASS)
(Leptochloa virgata)


EPSP synthase inhibitors (G/9)

Mexico, Veracruz
INTRODUCTION TROPICAL SPRANGLETOP (JUDDSGRASS)
Tropical Sprangletop (Juddsgrass) (Leptochloa virgata) is a monocot weed in the Poaceae family.  In Mexico this weed first evolved resistance to Group G/9 herbicides in 2010 and infests Orchards.   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 Mar 14, 2012 )

Common NameTropical Sprangletop (Juddsgrass)
SpeciesLeptochloa virgata
GroupEPSP synthase inhibitors (G/9)
Herbicidesglyphosate
LocationMexico, Veracruz
Year2010
Situation(s)Orchards
Contributors - (Alphabetically)Hugo Cruz-Hipólito, Rafael De Prado, Ja Dominguez Valenzuela, and Macrina Perez Lopez 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Tropical Sprangletop (Juddsgrass) biotype with this Tropical Sprangletop (Juddsgrass) 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 Tropical Sprangletop (Juddsgrass) 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 Tropical Sprangletop (Juddsgrass) 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
MACRINA PEREZ LOPEZ
Phd Student
Universidad De Cordoba
Quimica Agricola Y Edafologia
Campus De Rabanales C-3 Edif. Marie Curie Carr. Nac. Km. 396
Cordoba, 14017, Andalusia
Spain
Email Macrina Perez Lopez

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, and Macrina Perez Lopez for providing detailed information.
Herbicide Resistant Tropical Sprangletop (Juddsgrass) Globally
(Leptochloa virgata)
Herbicide Resistant Tropical Sprangletop (Juddsgrass) Globally
(Leptochloa virgata)
Drag a column header and drop it here to group by that column
Herbicide Resistant Tropical Sprangletop (Juddsgrass) Globally
(Leptochloa virgata)
#CountryFirstYearSituationActive IngredientsSite of Action
1 MexicoMexico 2010 Orchards glyphosate 29 EPSP synthase inhibitors (G/9)
270Leptochloa virgataTropical Sprangletop (Juddsgrass)5602
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Tuesday, July 25, 2017 .  Available  www.weedscience.org
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