International Survey of Herbicide-Resistant Weeds

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(Leptochloa chinensis)

ACCase inhibitors (A/1)

China, Hubei
Chinese Sprangletop (Leptochloa chinensis) is a monocot weed in the Poaceae family.  In China this weed first evolved resistance to Group A/1 herbicides in 2011 and infests Rice.   Group A/1 herbicides are known as ACCase inhibitors (Inhibition of Acetyl CoA Carboxylase ).  Research has shown that these particular biotypes are resistant to cyhalofop-butyl and they may be cross-resistant to other Group A/1 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 Sep 07, 2012 )

Common NameChinese Sprangletop
SpeciesLeptochloa chinensis
GroupACCase inhibitors (A/1)
LocationChina, Hubei
Contributors - (Alphabetically)Xuegang Peng 
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Confirmation Tests

Field trials comparing a known susceptible Chinese Sprangletop biotype with this Chinese Sprangletop 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 Group A/1 resistant Chinese Sprangletop 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 A/1 resistant Chinese Sprangletop from China please update the database.
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Research Associate
Qingdao kingagroot Ltd.
Research institute of maligant weeds
Email Xuegang Peng


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 Xuegang Peng for providing detailed information.
Herbicide Resistant Chinese Sprangletop Globally
(Leptochloa chinensis)
Herbicide Resistant Chinese Sprangletop Globally
(Leptochloa chinensis)
Drag a column header and drop it here to group by that column
Herbicide Resistant Chinese Sprangletop Globally
(Leptochloa chinensis)
#CountryFirstYearSituationActive IngredientsSite of Action
1 ChinaChina 2011 Rice cyhalofop-butyl 9 ACCase inhibitors (A/1)
223Leptochloa chinensisChinese Sprangletop5671
2 MalaysiaMalaysia 2006 Rice propanil 28 PSII inhibitors - Serine 264 Binders (C2/7)
223Leptochloa chinensisChinese Sprangletop10948
3 South KoreaSouth Korea 2012 Rice cyhalofop-butyl, fenoxaprop-P-ethyl, and metamifop 27 ACCase inhibitors (A/1)
223Leptochloa chinensisChinese Sprangletop7855
4 ThailandThailand 2002 Rice fenoxaprop-P-ethyl, profoxydim, and quizalofop-ethyl 47 ACCase inhibitors (A/1)
223Leptochloa chinensisChinese Sprangletop5199
Literature about Similar Cases

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