International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
(Bromus rubens)

EPSP synthase inhibitors (G/9)

Australia, Western Australia
Red Brome (Bromus rubens) is a monocot weed in the Poaceae family.  In Western Australia this weed first evolved resistance to Group G/9 herbicides in 2014 and infests Fallow.   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 03, 2015 )

Common NameRed Brome
SpeciesBromus rubens
GroupEPSP synthase inhibitors (G/9)
LocationAustralia, Western Australia
Contributors - (Alphabetically)Abul Hashem 
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Confirmation Tests

Greenhouse trials comparing a known susceptible Red Brome biotype with this Red Brome 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 Red Brome 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 Red Brome from Western Australia please update the database.
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Senior Research Officer (weed Science)
Agriculture Western Australia
Department Of Agriculture And Food Wa
Hampton Roads Ag Res And Ext Center
1444 Diamond Springs Rd,
Northam, 6401, Western Australia
Email Abul Hashem


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 Abul Hashem for providing detailed information.
Herbicide Resistant Red Brome Globally
(Bromus rubens)
Herbicide Resistant Red Brome Globally
(Bromus rubens)
Drag a column header and drop it here to group by that column
Herbicide Resistant Red Brome Globally
(Bromus rubens)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Australia (Western Australia) AustraliaWestern Australia2014 Fallow glyphosate 1 EPSP synthase inhibitors (G/9)
324Bromus rubensRed Brome10964
2 SpainSpain 2018 Almonds, Olive, and Orchards glyphosate 38 EPSP synthase inhibitors (G/9)
324Bromus rubensRed Brome18210
Literature about Similar Cases

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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Monday, January 18, 2021 .  Available
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