International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP C2/7 RESISTANT AMERICAN SLOUGHGRASS
(Beckmannia syzigachne)


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

China
INTRODUCTION AMERICAN SLOUGHGRASS
American Sloughgrass (Beckmannia syzigachne) is a monocot weed in the Poaceae family.  In China this weed first evolved resistance to Group C2/7 herbicides in 1993 and infests Cereals, and Wheat.   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 chlorotoluron 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 Jun 06, 2000 )

Common NameAmerican Sloughgrass
SpeciesBeckmannia syzigachne
GroupPSII inhibitor (Ureas and amides) (C2/7)
Herbicideschlorotoluron
LocationChina
Year1993
Situation(s)Cereals, and Wheat
Contributors - (Alphabetically)Heling Tu, and Tang-Hong Yuan 
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NOTES ABOUT THIS BIOTYPE

AREAS FOUND

Tang-Hong Yuan
Found in a suburb of Shanghai.

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GENERAL

Tang-Hong Yuan
Due to no crop rotation or cultivation, along with 20 years use of chlortoluron.

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ACADEMIC ASPECTS

Confirmation Tests

Field, 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 C2/7 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 C2/7 resistant American Sloughgrass from China please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

HELING TU
Quinghai Academy Of Agricultural Science
464 Plant& Soil Sciences Building
Xining, Qinghai
China
TANG-HONG YUAN
Shanghai Academy Of Agricultural Sciences
Plant Protection Institute
26 No555
Shanghai, Qinghai
China
Email Tang-Hong Yuan

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in China have been instrumental in providing you this information. Particular thanks is given to Heling Tu, and Tang-Hong Yuan 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.  Friday, November 22, 2019 .  Available  www.weedscience.org
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