International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP G/9 RESISTANT RESCUEGRASS
(Bromus catharticus)


EPSP synthase inhibitors (G/9)

Argentina, Buenos Aires Province
INTRODUCTION RESCUEGRASS
Rescuegrass (Bromus catharticus) is a monocot weed in the Poaceae family.  In Argentina this weed first evolved resistance to Group G/9 herbicides in 2017 and infests Fallow, Wheat, and Winter barley.   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.

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QUIK STATS (last updated Jul 02, 2018 )

Common NameRescuegrass
SpeciesBromus catharticus
GroupEPSP synthase inhibitors (G/9)
Herbicidesglyphosate
LocationArgentina, Buenos Aires Province
Year2017
Situation(s)Fallow, Wheat, and Winter barley
Contributors - (Alphabetically)Marcos Yanniccari 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Rescuegrass biotype with this Rescuegrass 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 G/9 resistant Rescuegrass 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 Rescuegrass from Argentina please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

MARCOS YANNICCARI
Dr
CONICET
Chacra Experimental Integrada Barrow
RN 3 km 487 cc 50
Tres Arroyos, 7500, Buenos Aires
Argentina
Email Marcos Yanniccari

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Argentina have been instrumental in providing you this information. Particular thanks is given to Marcos Yanniccari for providing detailed information.
Herbicide Resistant Rescuegrass Globally
(Bromus catharticus)
Herbicide Resistant Rescuegrass Globally
(Bromus catharticus)
Drag a column header and drop it here to group by that column
Herbicide Resistant Rescuegrass Globally
(Bromus catharticus)
#CountryFirstYearSituationActive IngredientsSite of Action
1 ArgentinaArgentina 2017 Fallow, Wheat, and Winter barley glyphosate 48 EPSP synthase inhibitors (G/9)
338Bromus catharticusRescuegrass17144
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Saturday, November 17, 2018 .  Available  www.weedscience.org
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