International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP G/9 RESISTANT SWEET SUMMER GRASS
(Brachiaria eruciformis)


EPSP synthase inhibitors (G/9)

Australia, Queensland
INTRODUCTION SWEET SUMMER GRASS
Sweet Summer Grass (Brachiaria eruciformis) is a monocot weed in the Poaceae family.  In Queensland 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.

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QUIK STATS (last updated Sep 01, 2014 )

Common NameSweet Summer Grass
SpeciesBrachiaria eruciformis
GroupEPSP synthase inhibitors (G/9)
Herbicidesglyphosate
LocationAustralia, Queensland
Year2014
Situation(s)Fallow
Contributors - (Alphabetically)Tony Cook, and Max Quinlivan 
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ACADEMIC ASPECTS

Confirmation Tests

Field, and Greenhouse trials comparing a known susceptible Sweet Summer Grass biotype with this Sweet Summer Grass 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 Sweet Summer Grass 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 Sweet Summer Grass from Queensland please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

TONY COOK
Technical Specialist Weeds
NSW Department of Primary Industries
Biosecurity NSW
Tamworth Agricultural Institute
4 Marsden Park Rd.
Calala, 2340, New South Wales
Australia
Email Tony Cook
Web   : Web Site Link
MAX QUINLIVAN
Extension Officer
Agri-Science Queensland
Department of Agriculture
Fisheries and Forestry
99 Hospital Rd
LMB 6
Emerald, 4720, Queensland
Australia
Email Max Quinlivan
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Queensland have been instrumental in providing you this information. Particular thanks is given to Tony Cook, and Max Quinlivan for providing detailed information.
Herbicide Resistant Sweet Summer Grass Globally
(Brachiaria eruciformis)
Herbicide Resistant Sweet Summer Grass Globally
(Brachiaria eruciformis)
Drag a column header and drop it here to group by that column
Herbicide Resistant Sweet Summer Grass Globally
(Brachiaria eruciformis)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Australia (Queensland) AustraliaQueensland2014 Fallow glyphosate 1 EPSP synthase inhibitors (G/9)
318Brachiaria eruciformisSweet Summer Grass8921
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Saturday, July 22, 2017 .  Available  www.weedscience.org
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