International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP A/1 RESISTANT KENG STIFFGRASS
(Sclerochloa kengiana)


ACCase inhibitors (A/1)

China, Jiangsu and Shandong Province
INTRODUCTION KENG STIFFGRASS
Keng Stiffgrass (Sclerochloa kengiana) is a monocot weed in the Poaceae family.  In China this weed first evolved resistance to Group A/1 herbicides in 2010 and infests Winter wheat.   Group A/1 herbicides are known as ACCase inhibitors (Inhibition of acetyl CoA carboxylase (ACCase)).  Research has shown that these particular biotypes are resistant to clodinafop-propargyl, and fenoxaprop-P-ethyl 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 Dec 17, 2013 )

Common NameKeng Stiffgrass
SpeciesSclerochloa kengiana
GroupACCase inhibitors (A/1)
Herbicidesclodinafop-propargyl, and fenoxaprop-P-ethyl
LocationChina, Jiangsu and Shandong Province
Year2010
Situation(s)Winter wheat
Contributors - (Alphabetically)Jinxin Wang, and Guohui Yuan 
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ACADEMIC ASPECTS

Confirmation Tests

Field, Greenhouse, and Laboratory trials comparing a known susceptible Keng Stiffgrass biotype with this Keng Stiffgrass 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 A/1 resistant Keng Stiffgrass 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

Studies on the mechanism of resistance of Group A/1 resistant Keng Stiffgrass from China indicate that resistance is due to an altered target site.  There may be a note below or an article discussing the mechanism of resistance in the Fact Sheets and Other Literature
 
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 Keng Stiffgrass from China please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

JINXIN WANG
Professor
Shandong Agricultural University
College Of Plant Protection
Daizong Road 61#
Tai'an, 271018, Shandong
China
Email Jinxin Wang
GUOHUI YUAN
Weed Scientist
Shandong Agricultural University
Laboratory of Pesticide Toxicology and Application Technique College of Plant Protection
Daizong Road 61#
Tai’an, 271018, Shandong
China
Email Guohui 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 Jinxin Wang, and Guohui Yuan for providing detailed information.
Herbicide Resistant Keng Stiffgrass Globally
(Sclerochloa kengiana)
Herbicide Resistant Keng Stiffgrass Globally
(Sclerochloa kengiana)
Drag a column header and drop it here to group by that column
Herbicide Resistant Keng Stiffgrass Globally
(Sclerochloa kengiana)
#CountryFirstYearSituationActive IngredientsSite of Action
1 ChinaChina 2010 Winter wheat clodinafop-propargyl, and fenoxaprop-P-ethyl 9 ACCase inhibitors (A/1)
297Sclerochloa kengianaKeng Stiffgrass7771
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Monday, March 27, 2017 .  Available  www.weedscience.org
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