International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
(Ehrharta longiflora)

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

Australia, Western Australia
Longflowered veldtgrass (Ehrharta longiflora) is a monocot weed in the Poaceae family.  In Western Australia this weed first evolved resistance to Group 1 (Legacy A) herbicides in 2014 and infests Bushland Reserve.   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 clethodim, haloxyfop-methyl, and quizalofop-ethyl 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.

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QUIK STATS (last updated Feb 03, 2015 )

Common NameLongflowered veldtgrass
SpeciesEhrharta longiflora
GroupInhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A)
Herbicidesclethodim, haloxyfop-methyl, and quizalofop-ethyl
LocationAustralia, Western Australia
Situation(s)Bushland Reserve
Contributors - (Alphabetically)Peter Boutsalis, and Sally Peltzer 
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Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible Longflowered veldtgrass biotype with this Longflowered veldtgrass 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 Longflowered veldtgrass 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 Longflowered veldtgrass from Western Australia please update the database.
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Postdoctural Fellow/ Consultant
University Of Adelaide / Plant Science Consulting
Plant And Pest Science
800 N Lindbergh Blvd
Adelaide, 5064, South Australia
Email Peter Boutsalis
Western Australia Research and Communications Officer
Western Australian Department of Agriculture and Food
Weed Research
444 Albany Highway
Albany, 6330, Western Australia
Email Sally Peltzer


The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Western Australia have been instrumental in providing you this information. Particular thanks is given to Peter Boutsalis, and Sally Peltzer for providing detailed information.
Herbicide Resistant Longflowered veldtgrass Globally
(Ehrharta longiflora)
Herbicide Resistant Longflowered veldtgrass Globally
(Ehrharta longiflora)
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Herbicide Resistant Longflowered veldtgrass Globally
(Ehrharta longiflora)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Australia (Western Australia) AustraliaWestern Australia2014 Bushland Reserve clethodim, haloxyfop-methyl, and quizalofop-ethyl 1 Inhibition of Acetyl CoA Carboxylase ( HRAC Group 1 (Legacy A)
315Ehrharta longifloraLongflowered veldtgrass 8899
Literature about Similar Cases

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