International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
(Cynosurus echinatus)

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

Chile, IX región
Hedgehog Dogtailgrass (Cynosurus echinatus) is a monocot weed in the Poaceae family.  In Chile this weed first evolved resistance to Group 1 (Legacy A) herbicides in 1999 and infests Canola, and 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 clodinafop-propargyl 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 Aug 07, 2012 )

Common NameHedgehog Dogtailgrass
SpeciesCynosurus echinatus
GroupInhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)
LocationChile, IX región
Situation(s)Canola, and Wheat
Contributors - (Alphabetically)Nelson Espinoza 
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Confirmation Tests

Greenhouse trials comparing a known susceptible Hedgehog Dogtailgrass biotype with this Hedgehog Dogtailgrass 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 Hedgehog Dogtailgrass 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 1 (Legacy A) resistant Hedgehog Dogtailgrass from Chile please update the database.
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Investigador Malherbología
Producción Vegetal
USDA-ARS, 302 Natural Resources Bldg
Cropping Systems& Water Quality
Email Nelson Espinoza
Web   : Web Site Link


The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Chile have been instrumental in providing you this information. Particular thanks is given to Nelson Espinoza for providing detailed information.
Herbicide Resistant Hedgehog Dogtailgrass Globally
(Cynosurus echinatus)
Herbicide Resistant Hedgehog Dogtailgrass Globally
(Cynosurus echinatus)
Drag a column header and drop it here to group by that column
Herbicide Resistant Hedgehog Dogtailgrass Globally
(Cynosurus echinatus)
#CountryFirstYearSituationActive IngredientsSite of Action
1 ChileChile 1999 Canola, and Wheat clodinafop-propargyl 8 Inhibition of Acetyl CoA Carboxylase ( HRAC Group 1 (Legacy A)
205Cynosurus echinatusHedgehog Dogtailgrass5104
2 ChileChile 2004 Wheat diclofop-methyl, flucarbazone-Na, halosulfuron-methyl, haloxyfop-methyl, and tepraloxydim 8 Multiple Resistance: 2 Sites of Action
Inhibition of Acetyl CoA Carboxylase ( HRAC Group 1 (Legacy A)
Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
205Cynosurus echinatusHedgehog Dogtailgrass5421
Literature about Similar Cases

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