International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
(Beckmannia syzigachne)

Inhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)

China, Anhui,Jiangsu
American Sloughgrass (Beckmannia syzigachne) is a monocot weed in the Poaceae family.  In China this weed first evolved resistance to Group 1 (Legacy A) herbicides in 2010 and infests Winter wheat.   Group 1 (Legacy A) herbicides are known as Inhibition of Acetyl CoA Carboxylase (Inhibition of Acetyl CoA Carboxylase ).  Research has shown that these particular biotypes are resistant to fenoxaprop-ethyl and they may be cross-resistant to other Group 1 (Legacy A) 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 Apr 05, 2012 )

Common NameAmerican Sloughgrass
SpeciesBeckmannia syzigachne
GroupInhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)
LocationChina, Anhui,Jiangsu
Situation(s)Winter wheat
Contributors - (Alphabetically)Jinxin Wang 
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Confirmation Tests

Greenhouse 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.

Genetic studies on HRAC Group 1 resistant American Sloughgrass indicate that the inheritance is determined by a one gene, dominant trait.  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 1 (Legacy A) resistant American Sloughgrass from China please update the database.
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Shandong Agricultural University
College Of Plant Protection
Daizong Road 61#
Tai'an, 271018, Shandong
Email Jinxin Wang


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 Jinxin Wang 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 inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)
31Beckmannia syzigachneAmerican Sloughgrass70
2 ChinaChina 2010 Winter wheat fenoxaprop-ethyl 9 Inhibition of Acetyl CoA Carboxylase ( HRAC Group 1 (Legacy A)
31Beckmannia syzigachneAmerican Sloughgrass5609
3 JapanJapan 2010 Spring Barley, and Wheat trifluralin 25 Inhibition of Microtubule Assembly ( HRAC Group 3 (Legacy K1)
31Beckmannia syzigachneAmerican Sloughgrass7768
Literature about Similar Cases

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