<b>HRAC Group 1</b> <font size='2'> (Legacy A) </font> resistant Ehrharta longiflora from Australia, Western Australia

INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

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

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

Australia, Western Australia

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
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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.

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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.

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Herbicide Resistant Longflowered veldtgrass Globally
(Ehrharta longiflora)

Country

FirstYear

Situation

Active Ingredients

Site of Action

Australia (Western Australia)

2014

Bushland Reserve

clethodim, haloxyfop-methyl, and quizalofop-ethyl

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

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PERMISSION MUST BE OBTAINED FIRST if you intend to base a significant portion of a scientific paper on data derived from this site. Citation:
Heap, I. The International Herbicide-Resistant Weed Database. Online. Saturday, July 5, 2025 . Available www.weedscience.org Copyright © 1993- 2025 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.