INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

HRAC GROUP 2 (LEGACY B) RESISTANT RICEFIELD BULRUSH
(Schoenoplectus mucronatus (=Scirpus mucronatus))


Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

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 2 (Legacy B) herbicides in 1997 and infests Rice.   Group 2 (Legacy B) herbicides are known as Inhibition of Acetolactate Synthase (Inhibition of Acetolactate Synthase ).  Research has shown that these particular biotypes are resistant to bensulfuron-methyl and they may be cross-resistant to other Group 2 (Legacy B) 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.

If we do not have a picture for this weed, or you can provide a better picture (scan, digital camera etc) please please e-mail it to us.

QUIK STATS (last updated Sep 15, 2000 )

Common NameRicefield Bulrush
SpeciesSchoenoplectus mucronatus (=Scirpus mucronatus)
GroupInhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicidesbensulfuron-methyl
LocationUnited States, California
Year1997
Situation(s)Rice
Contributors - (Alphabetically)Jim Hill 
Edit this Case  |  Add New Case of Resistance  |  Add Note

ACADEMIC ASPECTS

Confirmation Tests

Field, and Greenhouse 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 HRAC Group 2 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

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 2 (Legacy B) resistant Ricefield Bulrush from California please update the database.
 
Edit Case  |  Add Note  |  Add Article  |  Add New Case  |  

CONTRIBUTING WEED SCIENTISTS

JIM HILL
CE Specialist
University Of California
Agriculture and Natural Resources
One Shields Avenue
177 Hunt Hall
Davis, 95616, California
United States
Email Jim Hill
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 Jim Hill 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 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
182Schoenoplectus mucronatus (=Scirpus mucronatus)Ricefield Bulrush5396
2 ItalyItaly 1995 Rice azimsulfuron, bensulfuron-methyl, cinosulfuron, and ethoxysulfuron 24 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
182Schoenoplectus mucronatus (=Scirpus mucronatus)Ricefield Bulrush1129
3 United States (California) United StatesCalifornia1997 Rice bensulfuron-methyl 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
182Schoenoplectus mucronatus (=Scirpus mucronatus)Ricefield Bulrush1099
4 United States (California) United StatesCalifornia2014 Rice propanil 45 PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
182Schoenoplectus mucronatus (=Scirpus mucronatus)Ricefield Bulrush9924
Literature about Similar Cases

1
Page size:
select
Page: of 1
Items 1 to 3 of 3

1
Page size:
select
Page: of 1
Items 1 to 3 of 3

PERMISSION MUST BE OBTAINED FIRST if you intend to base a significant portion of a scientific paper on data derived from this site. Citation:
Heap, I.  The International Herbicide-Resistant Weed Database.  Online.  Wednesday, December 4, 2024 .  Available  www.weedscience.org Copyright © 1993- 2024 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.