International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP B/2 RESISTANT PASTO HONDURAS (MEXICANGRASS)
(Ixophorus unisetus)


ALS inhibitors (B/2)

Mexico, Jalisco and Guanajuato
INTRODUCTION PASTO HONDURAS (MEXICANGRASS)
Pasto Honduras (Mexicangrass) (Ixophorus unisetus) is a monocot weed in the Poaceae family.  In Mexico this weed first evolved resistance to Group B/2 herbicides in 2014 and infests Corn (maize).   Group B/2 herbicides are known as ALS inhibitors (Inhibition of acetolactate synthase ALS (acetohydroxyacid synthase AHAS)).  Research has shown that these particular biotypes are resistant to nicosulfuron and they may be cross-resistant to other Group B/2 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 Oct 17, 2014 )

Common NamePasto Honduras (Mexicangrass)
SpeciesIxophorus unisetus
GroupALS inhibitors (B/2)
Herbicidesnicosulfuron
LocationMexico, Jalisco and Guanajuato
Year2014
Situation(s)Corn (maize)
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 Pasto Honduras (Mexicangrass) biotype with this Pasto Honduras (Mexicangrass) 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 B/2 resistant Pasto Honduras (Mexicangrass) 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 B/2 resistant Pasto Honduras (Mexicangrass) 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 Pasto Honduras (Mexicangrass) Globally
(Ixophorus unisetus)
Herbicide Resistant Pasto Honduras (Mexicangrass) Globally
(Ixophorus unisetus)
Drag a column header and drop it here to group by that column
Herbicide Resistant Pasto Honduras (Mexicangrass) Globally
(Ixophorus unisetus)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Costa RicaCosta Rica 1988 Roadsides imazapyr 11 ALS inhibitors (B/2)
100Ixophorus unisetusPasto Honduras (Mexicangrass)74
2 MexicoMexico 2014 Corn (maize) nicosulfuron 29 ALS inhibitors (B/2)
100Ixophorus unisetusPasto Honduras (Mexicangrass)9925
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Monday, June 24, 2019 .  Available  www.weedscience.org
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