International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP K1/3 RESISTANT AMERICAN SLOUGHGRASS
(Beckmannia syzigachne)


Microtubule inhibitors (K1/3)

Japan, Fukuoka, Saga
INTRODUCTION AMERICAN SLOUGHGRASS
American Sloughgrass (Beckmannia syzigachne) is a monocot weed in the Poaceae family.  In Japan this weed first evolved resistance to Group K1/3 herbicides in 2010 and infests Spring Barley, and Wheat.   Group K1/3 herbicides are known as Microtubule inhibitors (Microtubule assembly inhibition).  Research has shown that these particular biotypes are resistant to trifluralin and they may be cross-resistant to other Group K1/3 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 Dec 29, 2013 )

Common NameAmerican Sloughgrass
SpeciesBeckmannia syzigachne
GroupMicrotubule inhibitors (K1/3)
Herbicidestrifluralin
LocationJapan, Fukuoka, Saga
Year2010
Situation(s)Spring Barley, and Wheat
Contributors - (Alphabetically)Satoshi Iwakami, Tohru Tominaga, and Akira Uchino 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible American Sloughgrass biotype with this American Sloughgrass 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 K1/3 resistant American Sloughgrass 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 K1/3 resistant American Sloughgrass from Japan please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

SATOSHI IWAKAMI
Weed Scientist
University of Tsukuba
Faculty of Life and Environmental Sciences
1-1-1 Tennoudai
Tsukuba, 305-8577, Ibaraki
Japan
Email Satoshi Iwakami
TOHRU TOMINAGA
Professor
Kyoto University
Graduate School of Agriculture
Kitashirakawa-Oiwakecho
Sakyo
Kyoto, 606-8502, Kyoto
Japan
Email Tohru Tominaga
AKIRA UCHINO
Weed Scientist
NARO Agricultural Research Center
Graduate School of Agriculture
3-1-1 Kannondai
Tsukuba, 305-8666, Ibaraki
Japan
Email Akira Uchino

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Japan have been instrumental in providing you this information. Particular thanks is given to Satoshi Iwakami, Tohru Tominaga, and Akira Uchino for providing detailed information.
Herbicide Resistant American Sloughgrass Globally
(Beckmannia syzigachne)
Herbicide Resistant American Sloughgrass Globally
(Beckmannia syzigachne)
Drag a column header and drop it here to group by that column
Herbicide Resistant American Sloughgrass Globally
(Beckmannia syzigachne)
#CountryFirstYearSituationActive IngredientsSite of Action
1 ChinaChina 1993 Cereals, and Wheat chlorotoluron 9 PSII inhibitor (Ureas and amides) (C2/7)
31Beckmannia syzigachneAmerican Sloughgrass70
2 ChinaChina 2010 Winter wheat fenoxaprop-P-ethyl 9 ACCase inhibitors (A/1)
31Beckmannia syzigachneAmerican Sloughgrass5609
3 JapanJapan 2010 Spring Barley, and Wheat trifluralin 25 Microtubule inhibitors (K1/3)
31Beckmannia syzigachneAmerican Sloughgrass7768
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Sunday, June 25, 2017 .  Available  www.weedscience.org
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