International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP C2/7 RESISTANT JAPANESE FOXTAIL
(Alopecurus japonicus)


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

China
INTRODUCTION JAPANESE FOXTAIL
Japanese Foxtail (Alopecurus japonicus) is a monocot weed in the Poaceae family.  In China this weed first evolved resistance to Group C2/7 herbicides in 1990 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 Sep 15, 2000 )

Common NameJapanese Foxtail
SpeciesAlopecurus japonicus
GroupPSII inhibitor (Ureas and amides) (C2/7)
Herbicideschlorotoluron
LocationChina
Year1990
Situation(s)Cereals, and Wheat
Contributors - (Alphabetically)Tang-Hong Yuan 
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NOTES ABOUT THIS BIOTYPE

AREAS FOUND

Tang-Hong Yuan
Near the city of Shanghai.

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GENERAL

Tang-Hong Yuan
Serious problem in wheat and barley. Single use of chlortoluron for up to 20 years. Single cropping system without cultivation.

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ACADEMIC ASPECTS

Confirmation Tests

Field, and Greenhouse trials comparing a known susceptible Japanese Foxtail biotype with this Japanese Foxtail 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 Japanese Foxtail 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 Japanese Foxtail from China please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

TANG-HONG YUAN
Shanghai Academy Of Agricultural Sciences
Plant Protection Institute
26 No555
Shanghai
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 Tang-Hong Yuan for providing detailed information.
Herbicide Resistant Japanese Foxtail Globally
(Alopecurus japonicus)
Herbicide Resistant Japanese Foxtail Globally
(Alopecurus japonicus)
Drag a column header and drop it here to group by that column
Herbicide Resistant Japanese Foxtail Globally
(Alopecurus japonicus)
#CountryFirstYearSituationActive IngredientsSite of Action
1 ChinaChina 1990 Cereals, and Wheat chlorotoluron 9 PSII inhibitor (Ureas and amides) (C2/7)
5Alopecurus japonicusJapanese Foxtail68
2 ChinaChina 2007 Canola, and Winter wheat clodinafop-propargyl, fenoxaprop-P-ethyl, haloxyfop-methyl, and pinoxaden 9 ACCase inhibitors (A/1)
5Alopecurus japonicusJapanese Foxtail5608
3 ChinaChina 2010 Unspecified paraquat 9 PSI Electron Diverter (D/22)
5Alopecurus japonicusJapanese Foxtail5649
4 ChinaChina 2014 Wheat fenoxaprop-P-ethyl, mesosulfuron-methyl, nicosulfuron, pyribenzoxim, pyroxsulam, and sulfosulfuron 9 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
5Alopecurus japonicusJapanese Foxtail10955
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Friday, July 19, 2019 .  Available  www.weedscience.org
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