International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP B/2 RESISTANT ROCK BULRUSH
(Schoenoplectus juncoides)


ALS inhibitors (B/2)

South Korea
INTRODUCTION ROCK BULRUSH
Rock Bulrush (Schoenoplectus juncoides) is a monocot weed in the Cyperaceae family.  In South Korea this weed first evolved resistance to Group B/2 herbicides in 2001 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 azimsulfuron, bensulfuron-methyl, cyclosulfamuron, ethoxysulfuron, halosulfuron-methyl, imazosulfuron, 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 Jan 22, 2014 )

Common NameRock Bulrush
SpeciesSchoenoplectus juncoides
GroupALS inhibitors (B/2)
Herbicidesazimsulfuron, bensulfuron-methyl, cyclosulfamuron, ethoxysulfuron, halosulfuron-methyl, imazosulfuron, and pyrazosulfuron-ethyl
LocationSouth Korea
Year2001
Situation(s)Rice
Contributors - (Alphabetically)Il-Bin Im 
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NOTES ABOUT THIS BIOTYPE

AREAS FOUND

Il-Bin Im
Kimje of Korea

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AREAS FOUND

Kazuyuki Itoh
Hokkaido and Tohoku district.

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ONGOING RESEARCH

Kazuyuki Itoh
Hiroshi Kohara, Kazuo Konno, and Masakazu Takekawa, Hokkaido Central Agricultural Experiment Station, Kamihoromui, Iwamizawa, Hokkaido, 069-0365, Japan.

Yoshida, S., K. Onodera, S. Soeda, Y. Takeda, S. Sasaki, and N. Hoshi, Furukawa Prefectual Agricultural Experiment Station, 88, Tomikuni, Osaki, Furukawa, Miyagi, Japan.

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OTHER CONTACTS

Il-Bin Im

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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Rock Bulrush biotype with this Rock 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 Rock 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 B/2 resistant Rock Bulrush from South Korea please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

IL-BIN IM
CRO
Bio-Plant Environment Research Center
Weed Control
5306-1. BI Center. Honam University
Kwangsan, 506-714, Kwangju
South Korea
Email Il-Bin Im
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in South Korea have been instrumental in providing you this information. Particular thanks is given to Il-Bin Im for providing detailed information.
Herbicide Resistant Rock Bulrush Globally
(Schoenoplectus juncoides)
Herbicide Resistant Rock Bulrush Globally
(Schoenoplectus juncoides)
Drag a column header and drop it here to group by that column
Herbicide Resistant Rock Bulrush Globally
(Schoenoplectus juncoides)
#CountryFirstYearSituationActive IngredientsSite of Action
1 JapanJapan 1996 Rice bensulfuron-methyl, cyclosulfamuron, ethoxysulfuron, imazosulfuron, and pyrazosulfuron-ethyl 25 ALS inhibitors (B/2)
196Schoenoplectus juncoidesRock Bulrush5131
2 South KoreaSouth Korea 2001 Rice azimsulfuron, bensulfuron-methyl, cyclosulfamuron, ethoxysulfuron, halosulfuron-methyl, imazosulfuron, and pyrazosulfuron-ethyl 27 ALS inhibitors (B/2)
196Schoenoplectus juncoidesRock Bulrush5044
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Thursday, June 20, 2019 .  Available  www.weedscience.org
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