International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP C2/7 RESISTANT RICEFIELD BULRUSH
(Schoenoplectus mucronatus (=Scirpus mucronatus))


PSII inhibitor (Ureas and amides) (C2/7)

United States, California
INTRODUCTION RICEFIELD BULRUSH
Ricefield Bulrush (Schoenoplectus mucronatus (=Scirpus mucronatus)) is a monocot weed in the Cyperaceae family.  In California this weed first evolved resistance to Group C2/7 herbicides in 2014 and infests Rice.   Group C2/7 herbicides are known as PSII inhibitor (Ureas and amides) (Inhibition of photosynthesis at photosystem II).  Research has shown that these particular biotypes are resistant to propanil and they may be cross-resistant to other Group C2/7 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 14, 2014 )

Common NameRicefield Bulrush
SpeciesSchoenoplectus mucronatus (=Scirpus mucronatus)
GroupPSII inhibitor (Ureas and amides) (C2/7)
Herbicidespropanil
LocationUnited States, California
Year2014
Situation(s)Rice
Contributors - (Alphabetically)Albert Fischer, and Rafael Pedroso 
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ACADEMIC ASPECTS

Confirmation Tests

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 C2/7 resistant Ricefield Bulrush 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 C2/7 resistant Ricefield Bulrush from California indicate that resistance is due to enhanced metabolism.  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 C2/7 resistant Ricefield Bulrush from California please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

ALBERT FISCHER
Professor
University Of California
Department of Plant Sciences
Weed Ecophysiology
Mail Stop #4 279/279A Robbins Hall
Davis, 95616, California
United States
Email Albert Fischer
Web   : Web Site Link
RAFAEL PEDROSO
PhD Student and Graduate Student Researcher
University of California at Davis
Plant Sciences
One Shields Avenue
Davis, 95616, California
United States
Email Rafael Pedroso
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in California have been instrumental in providing you this information. Particular thanks is given to Albert Fischer, and Rafael Pedroso 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.  Monday, December 17, 2018 .  Available  www.weedscience.org
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