International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP O/4 RESISTANT TALL BUTTERCUP
(Ranunculus acris)


Synthetic Auxins (O/4)

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 O/4 herbicides in 1988 and infests Pastures.   Group O/4 herbicides are known as Synthetic Auxins (Synthetic auxins (action like indoleacetic acid)).  Research has shown that these particular biotypes are resistant to MCPA and they may be cross-resistant to other Group O/4 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 Jun 06, 2000 )

Common NameTall Buttercup
SpeciesRanunculus acris
GroupSynthetic Auxins (O/4)
HerbicidesMCPA
LocationNew Zealand
Year1988
Situation(s)Pastures
Contributors - (Alphabetically)Graeme Bourdot, and Anis Rahman 
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NOTES ABOUT THIS BIOTYPE

AREAS FOUND

Anis Rahman
Golden Bay (South Island). Taranaki ; Hawkes Bay, Wairarapa.

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GENERAL

Anis Rahman
A weed of limited distribution. Confined to dairy pastures in certain locations where some pastures have been treated with phenoxy herbicides for 10 to 20 years.

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ACADEMIC ASPECTS

Confirmation Tests

Field, and 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 Group O/4 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 O/4 resistant Tall Buttercup from New Zealand please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

GRAEME BOURDOT
Canterbury Agricultural & Science Centregerald
Street, P.o. Box 60
Lincoln
New Zealand
Email Graeme Bourdot
ANIS RAHMAN
Ruakura Agricultural Centre
Ag. Research
3205 College Ave
Hamilton
New Zealand
Email Anis Rahman

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 Graeme Bourdot, and Anis Rahman 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 Synthetic Auxins (O/4)
140Ranunculus acrisTall Buttercup159
2 New ZealandNew Zealand 2010 Pastures flumetsulam, and thifensulfuron-methyl 30 ALS inhibitors (B/2)
140Ranunculus acrisTall Buttercup5732
3 New ZealandNew Zealand 2010 Pastures flumetsulam, MCPA, and thifensulfuron-methyl 30 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Synthetic Auxins (O/4)
140Ranunculus acrisTall Buttercup14057
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Monday, November 18, 2019 .  Available  www.weedscience.org
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