International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
(Chloris truncata)

EPSP synthase inhibitors (G/9)

Australia, Victoria
Windmill Grass (Chloris truncata) is a monocot weed in the Poaceae family.  In Victoria this weed first evolved resistance to Group G/9 herbicides in 2015 and infests Roadsides.   Group G/9 herbicides are known as EPSP synthase inhibitors (Inhibition of EPSP synthase).  Research has shown that these particular biotypes are resistant to glyphosate and they may be cross-resistant to other Group G/9 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 Feb 08, 2016 )

Common NameWindmill Grass
SpeciesChloris truncata
GroupEPSP synthase inhibitors (G/9)
LocationAustralia, Victoria
Contributors - (Alphabetically)Christopher Preston 
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Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible Windmill Grass biotype with this Windmill Grass 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 G/9 resistant Windmill Grass 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 G/9 resistant Windmill Grass from Victoria please update the database.
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University Of Adelaide - Waite Campus
Crc For Australian Weed Management And School Of Agriculture
Box 2146
Adelaide, 5064, South Australia
Email Christopher Preston


The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Victoria have been instrumental in providing you this information. Particular thanks is given to Christopher Preston for providing detailed information.
Herbicide Resistant Windmill Grass Globally
(Chloris truncata)
Herbicide Resistant Windmill Grass Globally
(Chloris truncata)
Drag a column header and drop it here to group by that column
Herbicide Resistant Windmill Grass Globally
(Chloris truncata)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Australia (New South Wales ) AustraliaNew South Wales 2010 Fallow glyphosate 1 EPSP synthase inhibitors (G/9)
262Chloris truncataWindmill Grass5509
2 Australia (Victoria) AustraliaVictoria2015 Roadsides glyphosate 1 EPSP synthase inhibitors (G/9)
262Chloris truncataWindmill Grass11021
Literature about Similar Cases

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