International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
HRAC GROUP 9 (LEGACY G) RESISTANT FEATHER FINGERGRASS
(Chloris virgata)


Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)

Australia, Queensland
INTRODUCTION FEATHER FINGERGRASS
Feather Fingergrass (Chloris virgata) is a monocot weed in the Poaceae family.  In Queensland this weed first evolved resistance to Group 9 (Legacy G) herbicides in 2015 and infests Fallow.   Group 9 (Legacy G) herbicides are known as Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (Inhibition of EPSP synthase).  Research has shown that these particular biotypes are resistant to glyphosate and they may be cross-resistant to other Group 9 (Legacy G) 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 08, 2016 )

Common NameFeather Fingergrass
SpeciesChloris virgata
GroupInhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)
Herbicidesglyphosate
LocationAustralia, Queensland
Year2015
Situation(s)Fallow
Contributors - (Alphabetically)Christopher Preston 
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NOTES ABOUT THIS BIOTYPE

GENERAL

Bhagirath Chauhan

Target-Site Resistance to Glyphosate in Chloris Virgata Biotypes and Alternative Herbicide Options for its Control

 Het Samir Desai 1,2,*, Michael Thompson 1 and Bhagirath Singh Chauhan 1,2

  • 1Queensland Alliance for Agriculture and Food Innovation (QAAFI), The University of Queensland,Gatton 4343, Australia; michael.thompson1@uq.edu.au (M.T.); b.chauhan@uq.edu.au (B.S.C.)
  • 2School of Agriculture and Food Sciences (SAFS), The University of Queensland, Gatton 4343, Australia

*          Correspondence: het.desai@student.montana.edu

Received: 31 July 2020; Accepted: 25 August 2020; Published: 27 August 2020

Abstract: Due to the overdependence on glyphosate to manage weeds in fallow conditions, glyphosate resistance has developed in various biotypes of several grass weeds, including Chloris virgata Sw. The first case of glyphosate resistance in C. virgata was found in 2015 in Australia, and since then several cases have been confirmed in several biotypes across Australia. Pot studies were conducted with 10 biotypes of C. virgata to determine glyphosate resistance levels. The biotypes were identified as either susceptible, moderately resistant or highly resistant based on the glyphosate dose required to kill 50% of plants. Two glyphosate-susceptible (GS) and two glyphosate-resistant (GR) biotypes were identified by the dose-response study and analyzed for the presence of target-site mutation in the 5–enolpyruvylshikimate-3-phosphate synthase (EPSPS) gene. Performance of alternative herbicides to glyphosate as well as the double-knock herbicide approach was evaluated on the two GS (Ch and SGM2) and two GR (SGW2 and CP2) biotypes. Three herbicides, clethodim, haloxyfop and paraquat, were found to be effective (100% control) against all four.

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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible Feather Fingergrass biotype with this Feather Fingergrass 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 9 resistant Feather Fingergrass 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 9 (Legacy G) resistant Feather Fingergrass from Queensland please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

CHRISTOPHER PRESTON
University Of Adelaide - Waite Campus
Crc For Australian Weed Management And School Of Agriculture
Box 2146
Adelaide, 5064, South Australia
Australia
Email Christopher Preston

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 Christopher Preston for providing detailed information.
Herbicide Resistant Feather Fingergrass Globally
(Chloris virgata)
Herbicide Resistant Feather Fingergrass Globally
(Chloris virgata)
Drag a column header and drop it here to group by that column
Herbicide Resistant Feather Fingergrass Globally
(Chloris virgata)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Australia (New South Wales ) AustraliaNew South Wales 2015 Fallow glyphosate 1 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
330Chloris virgataFeather Fingergrass11026
2 Australia (Queensland) AustraliaQueensland2015 Fallow glyphosate 1 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
330Chloris virgataFeather Fingergrass11027
3 Australia (South Australia) AustraliaSouth Australia2015 Roadsides glyphosate 1 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
330Chloris virgataFeather Fingergrass11028
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