International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
HRAC GROUP 2 (LEGACY B) RESISTANT TALL BUTTERCUP
(Ranunculus acris)


Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

New Zealand
INTRODUCTION TALL BUTTERCUP
Tall Buttercup (Ranunculus acris) is a dicot weed in the Ranunculaceae family.  In New Zealand this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2010 and infests Pastures.   Group 2 (Legacy B) herbicides are known as Inhibition of Acetolactate Synthase (Inhibition of Acetolactate Synthase ).  Research has shown that these particular biotypes are resistant to flumetsulam, and thifensulfuron-methyl and they may be cross-resistant to other Group 2 (Legacy B) 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 Nov 17, 2016 )

Common NameTall Buttercup
SpeciesRanunculus acris
GroupInhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicidesflumetsulam, and thifensulfuron-methyl
LocationNew Zealand
Year2010
Situation(s)Pastures
Contributors - (Alphabetically)Kerry Harrington 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Tall Buttercup biotype with this Tall Buttercup 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 2 resistant Tall Buttercup 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 2 (Legacy B) resistant Tall Buttercup from New Zealand please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

KERRY HARRINGTON
Associate Professor in Weed Science
Massey University
School of Agriculture
Private Bag 11-222
Palmerston North, 4442, Manawatu
New Zealand
Email Kerry Harrington
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in New Zealand have been instrumental in providing you this information. Particular thanks is given to Kerry Harrington for providing detailed information.
Herbicide Resistant Tall Buttercup Globally
(Ranunculus acris)
Herbicide Resistant Tall Buttercup Globally
(Ranunculus acris)
Drag a column header and drop it here to group by that column
Herbicide Resistant Tall Buttercup Globally
(Ranunculus acris)
#CountryFirstYearSituationActive IngredientsSite of Action
1 New ZealandNew Zealand 1988 Pastures MCPA 30 Auxin Mimics ( HRAC Group 4 (Legacy O)
140Ranunculus acrisTall Buttercup159
2 New ZealandNew Zealand 2010 Pastures flumetsulam, and thifensulfuron-methyl 30 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
140Ranunculus acrisTall Buttercup5732
3 New ZealandNew Zealand 2010 Pastures flumetsulam, MCPA, and thifensulfuron-methyl 30 Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
Auxin Mimics ( HRAC Group 4 (Legacy O)
140Ranunculus acrisTall Buttercup14057
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