International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
HRAC GROUP 15 (LEGACY K3 N) RESISTANT SERRATED TUSSOCK
(Nassella trichotoma)


Very Long-Chain Fatty Acid Synthesis inhibitorsHRAC Group 15 (Legacy K3 N)

Australia, Victoria
INTRODUCTION SERRATED TUSSOCK
Serrated Tussock (Nassella trichotoma) is a monocot weed in the Poaceae family.  In Victoria this weed first evolved resistance to Group 15 (Legacy K3 N) herbicides in 2002 and infests Pastures.   Group 15 (Legacy K3 N) herbicides are known as Very Long-Chain Fatty Acid Synthesis inhibitors (Inhibition of Very Long-Chain Fatty Acid Synthesis ).  Research has shown that these particular biotypes are resistant to flupropanate and they may be cross-resistant to other Group 15 (Legacy K3 N) 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 23, 2003 )

Common NameSerrated Tussock
SpeciesNassella trichotoma
GroupVery Long-Chain Fatty Acid Synthesis inhibitors HRAC Group 15 (Legacy K3 N)
Herbicidesflupropanate
LocationAustralia, Victoria
Year2002
Situation(s)Pastures
Contributors - (Alphabetically)Christopher Preston 
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NOTES ABOUT THIS BIOTYPE

GENERAL

Christopher Preston
Flupropanate had been used for 17 years on this pasture. R/S comparison in pot trials conducted twice showed an 8-fold increase in resistance. The local contact for this case is David McLaren (David.McLaren@nre.vic.gov.au)

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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Serrated Tussock biotype with this Serrated Tussock 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 15 resistant Serrated Tussock 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 15 (Legacy K3 N) resistant Serrated Tussock from Victoria 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 Victoria have been instrumental in providing you this information. Particular thanks is given to Christopher Preston for providing detailed information.
Herbicide Resistant Serrated Tussock Globally
(Nassella trichotoma)
Herbicide Resistant Serrated Tussock Globally
(Nassella trichotoma)
Drag a column header and drop it here to group by that column
Herbicide Resistant Serrated Tussock Globally
(Nassella trichotoma)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Australia (Victoria) AustraliaVictoria2002 Pastures flupropanate 1 Very Long-Chain Fatty Acid Synthesis inhibitors ( HRAC Group 15 (Legacy K3 N)
221Nassella trichotomaSerrated Tussock5189
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