HRAC GROUP 1 (LEGACY A) RESISTANT LONGFLOWERED VELDTGRASS
(Ehrharta longiflora)

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

Australia, Western Australia

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INTRODUCTION LONGFLOWERED VELDTGRASS 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.

QUIK STATS (last updated Feb 03, 2015 ) Common Name Longflowered veldtgrass Species Ehrharta longiflora Group Inhibition of Acetyl CoA Carboxylase HRAC Group 1 (Legacy A) Herbicides clethodim, haloxyfop-methyl, and quizalofop-ethyl Location Australia, Western Australia Year 2014 Situation(s) Bushland Reserve Contributors - (Alphabetically) Peter Boutsalis, and Sally Peltzer  Edit this Case  |  Add New Case of Resistance  |  Add Note

ACADEMIC ASPECTS 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.   Genetics 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.   Edit Case  |  Add Note  |  Add Article  |  Add New Case  |  Help

CONTRIBUTING WEED SCIENTISTS PETER BOUTSALIS Postdoctural Fellow/ Consultant University Of Adelaide / Plant Science Consulting Plant And Pest Science 800 N Lindbergh Blvd 02G Adelaide, 5064, South Australia Australia Email Peter Boutsalis SALLY PELTZER Western Australia Research and Communications Officer Western Australian Department of Agriculture and Food Weed Research 444 Albany Highway Orana Albany, 6330, Western Australia Australia Email Sally Peltzer

ACKNOWLEDGEMENTS 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) Drag a column header and drop it here to group by that column Herbicide Resistant Longflowered veldtgrass Globally (Ehrharta longiflora) # Country Country StateName FirstYear Situation Active Ingredients CountryID Site of Action WeedID Species CommonName ResistID 1 Australia (Western Australia) Australia Western Australia 2014 Bushland Reserve clethodim, haloxyfop-methyl, and quizalofop-ethyl 1 Inhibition of Acetyl CoA Carboxylase ( HRAC Group 1 (Legacy A) 315 Ehrharta longiflora Longflowered veldtgrass 8899

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