International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP B/2 RESISTANT RICEFIELD BULRUSH
(Schoenoplectus mucronatus (=Scirpus mucronatus))


ALS inhibitors (B/2)

Chile, Linares
INTRODUCTION RICEFIELD BULRUSH
Ricefield Bulrush (Schoenoplectus mucronatus (=Scirpus mucronatus)) is a monocot weed in the Cyperaceae family.  In Chile this weed first evolved resistance to Group B/2 herbicides in 2005 and infests Rice.   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 bensulfuron-methyl, bispyribac-sodium, cyclosulfamuron, ethoxysulfuron, imazamox, and pyrazosulfuron-ethyl 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 20, 2009 )

Common NameRicefield Bulrush
SpeciesSchoenoplectus mucronatus (=Scirpus mucronatus)
GroupALS inhibitors (B/2)
Herbicidesbensulfuron-methyl, bispyribac-sodium, cyclosulfamuron, ethoxysulfuron, imazamox, and pyrazosulfuron-ethyl
LocationChile, Linares
Year2005
Situation(s)Rice
Contributors - (Alphabetically)Hugo Cruz-Hipólito, Rafael De Prado, and Victor Kramm 
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ACADEMIC ASPECTS

Confirmation Tests

Field, Greenhouse, and Laboratory trials comparing a known susceptible Ricefield Bulrush biotype with this Ricefield Bulrush 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 Ricefield Bulrush indicate that the inheritance is determined by a one gene, dominant, cytoplasmic trait.  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 B/2 resistant Ricefield Bulrush from Chile 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 B/2 resistant Ricefield Bulrush from Chile 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
VICTOR KRAMM
Research Asociate
Instituto De Investigaciones Agropecuarias, Centro Regional
Qvimica Agricola Y Edafologa
E T S Ingenieros Agronomos
P.o.box 9
Villa Alegre, E-14080, Andalusia
Chile
Email Victor Kramm

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Chile have been instrumental in providing you this information. Particular thanks is given to Hugo Cruz-Hipólito, Rafael De Prado, and Victor Kramm for providing detailed information.
Herbicide Resistant Ricefield Bulrush Globally
(Schoenoplectus mucronatus (=Scirpus mucronatus))
Herbicide Resistant Ricefield Bulrush Globally
(Schoenoplectus mucronatus (=Scirpus mucronatus))
Drag a column header and drop it here to group by that column
Herbicide Resistant Ricefield Bulrush Globally
(Schoenoplectus mucronatus (=Scirpus mucronatus))
#CountryFirstYearSituationActive IngredientsSite of Action
1 ChileChile 2005 Rice bensulfuron-methyl, bispyribac-sodium, cyclosulfamuron, ethoxysulfuron, imazamox, and pyrazosulfuron-ethyl 8 ALS inhibitors (B/2)
182Schoenoplectus mucronatus (=Scirpus mucronatus)Ricefield Bulrush5396
2 ItalyItaly 1995 Rice azimsulfuron, bensulfuron-methyl, cinosulfuron, and ethoxysulfuron 24 ALS inhibitors (B/2)
182Schoenoplectus mucronatus (=Scirpus mucronatus)Ricefield Bulrush1129
3 United States (California) United StatesCalifornia1997 Rice bensulfuron-methyl 45 ALS inhibitors (B/2)
182Schoenoplectus mucronatus (=Scirpus mucronatus)Ricefield Bulrush1099
4 United States (California) United StatesCalifornia2014 Rice propanil 45 PSII inhibitor (Ureas and amides) (C2/7)
182Schoenoplectus mucronatus (=Scirpus mucronatus)Ricefield Bulrush9924
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Friday, September 20, 2019 .  Available  www.weedscience.org
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