International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP O/4 RESISTANT MUSK THISTLE
(Carduus nutans)


Synthetic Auxins (O/4)

New Zealand
INTRODUCTION MUSK THISTLE
Musk Thistle (Carduus nutans) is a dicot weed in the Asteraceae family.  In New Zealand this weed first evolved resistance to Group O/4 herbicides in 1981 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 2,4-D 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.

If we do not have a picture for this weed, or you can provide a better picture (scan, digital camera etc) please please e-mail it to us.

QUIK STATS (last updated Jun 06, 2000 )

Common NameMusk Thistle
SpeciesCarduus nutans
GroupSynthetic Auxins (O/4)
Herbicides2,4-D
LocationNew Zealand
Year1981
Situation(s)Pastures
Contributors - (Alphabetically)Kerry Harrington, and Anis Rahman 
Edit this Case  |  Add New Case of Resistance  |  Add Note

NOTES ABOUT THIS BIOTYPE

AREAS FOUND

Anis Rahman
Waikato, Hawkes Bay, Manawatu, etc.

Edit this Note  |  Add New Note
 
CONTROL STRATEGIES

Anis Rahman
This thistle is controlled by adding clopyralid to the phenoxy herbicide which causes severe damage to clovers in pasture. True cost is not shown as there is damage to the clover.

Edit this Note  |  Add New Note
 
GENERAL

Anis Rahman
This weed is a problem in pastures. Our pastures have two components viz. ryegrass and clovers. It is difficult to find herbicides selective enough to both components that will control the thistles. Also resistant to MCPA.

Edit this Note  |  Add New Note
 

ACADEMIC ASPECTS

Confirmation Tests

Field, and Greenhouse trials comparing a known susceptible Musk Thistle biotype with this Musk Thistle 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 Musk Thistle 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 Musk Thistle from New Zealand please update the database.
 
Edit Case  |  Add Note  |  Add Article  |  Add New Case  |  Help

CONTRIBUTING WEED SCIENTISTS

KERRY HARRINGTON
Massey University
624 Betts Rd
Palmerston North
New Zealand
Email Kerry Harrington
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 Kerry Harrington, and Anis Rahman for providing detailed information.
Herbicide Resistant Musk Thistle Globally
(Carduus nutans)
Herbicide Resistant Musk Thistle Globally
(Carduus nutans)
Drag a column header and drop it here to group by that column
Herbicide Resistant Musk Thistle Globally
(Carduus nutans)
#CountryFirstYearSituationActive IngredientsSite of Action
1 New ZealandNew Zealand 1981 Pastures 2,4-D 30 Synthetic Auxins (O/4)
42Carduus nutansMusk Thistle158
Literature about Similar Cases

123
Page size:
select
Page: of 3
Items 1 to 5 of 12

123
Page size:
select
Page: of 3
Items 1 to 5 of 12
PERMISSION MUST BE OBTAINED FIRST if you intend to base a significant portion of a scientific paper on data derived from this site.
Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Monday, September 16, 2019 .  Available  www.weedscience.org
Copyright © 1993- 2019 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.