International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP A/1 RESISTANT HARE BARLEY
(Hordeum murinum ssp. leporinum)


ACCase inhibitors (A/1)

Australia, New South Wales
INTRODUCTION HARE BARLEY
Hare Barley (Hordeum murinum ssp. leporinum) is a monocot weed in the Poaceae family.  In New South Wales this weed first evolved resistance to Group A/1 herbicides in 2001 and infests Canola.   Group A/1 herbicides are known as ACCase inhibitors (Inhibition of acetyl CoA carboxylase (ACCase)).  Research has shown that these particular biotypes are resistant to clethodim, and haloxyfop-P-methyl and they may be cross-resistant to other Group A/1 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 20, 2003 )

Common NameHare Barley
SpeciesHordeum murinum ssp. leporinum
GroupACCase inhibitors (A/1)
Herbicidesclethodim, and haloxyfop-P-methyl
LocationAustralia, New South Wales
Year2001
Situation(s)Canola
Contributors - (Alphabetically)John Broster 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Hare Barley biotype with this Hare Barley 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 Group A/1 resistant Hare Barley 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 A/1 resistant Hare Barley from New South Wales please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

JOHN BROSTER
Research Agronomist
Charles Sturt University
EH Graham Centre
Locked Bag 588
Wagga Wagga, 2678, New South Wales
Australia
Email John Broster

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in New South Wales have been instrumental in providing you this information. Particular thanks is given to John Broster for providing detailed information.
Herbicide Resistant Hare Barley Globally
(Hordeum murinum ssp. leporinum)
Herbicide Resistant Hare Barley Globally
(Hordeum murinum ssp. leporinum)
Drag a column header and drop it here to group by that column
Herbicide Resistant Hare Barley Globally
(Hordeum murinum ssp. leporinum)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Australia (Victoria) AustraliaVictoria1988 Alfalfa diquat, and paraquat 1 PSI Electron Diverter (D/22)
98Hordeum murinum ssp. leporinumHare Barley18
2 Australia (South Australia) AustraliaSouth Australia1996 Canola, Pastures, and Winter pulses fluazifop-P-butyl, haloxyfop-etotyl, and quizalofop-P-ethyl 1 ACCase inhibitors (A/1)
98Hordeum murinum ssp. leporinumHare Barley1143
3 Australia (New South Wales ) AustraliaNew South Wales 2001 Canola clethodim, and haloxyfop-P-methyl 1 ACCase inhibitors (A/1)
98Hordeum murinum ssp. leporinumHare Barley5098
4 Australia (South Australia) AustraliaSouth Australia2001 Alfalfa paraquat 1 PSI Electron Diverter (D/22)
98Hordeum murinum ssp. leporinumHare Barley5203
Literature about Similar Cases

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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Wednesday, April 26, 2017 .  Available  www.weedscience.org
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