International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP O/4 RESISTANT CAPEWEED
(Arctotheca calendula)


Synthetic Auxins (O/4)

Australia, South Australia
INTRODUCTION CAPEWEED
Capeweed (Arctotheca calendula) is a dicot weed in the Asteraceae family.  In South Australia this weed first evolved resistance to Group O/4 herbicides in 2015 and infests Fallow.   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.

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QUIK STATS (last updated Dec 02, 2016 )

Common NameCapeweed
SpeciesArctotheca calendula
GroupSynthetic Auxins (O/4)
Herbicides2,4-D
LocationAustralia, South Australia
Year2015
Situation(s)Fallow
Contributors - (Alphabetically)Christopher Preston 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible Capeweed biotype with this Capeweed 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 Capeweed 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 Capeweed from South Australia 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 South Australia have been instrumental in providing you this information. Particular thanks is given to Christopher Preston for providing detailed information.
Herbicide Resistant Capeweed Globally
(Arctotheca calendula)
Herbicide Resistant Capeweed Globally
(Arctotheca calendula)
Drag a column header and drop it here to group by that column
Herbicide Resistant Capeweed Globally
(Arctotheca calendula)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Australia (Victoria) AustraliaVictoria1986 Alfalfa diquat 1 PSI Electron Diverter (D/22)
21Arctotheca calendulaCapeweed22
2 Australia (South Australia) AustraliaSouth Australia2015 Fallow 2,4-D 1 Synthetic Auxins (O/4)
21Arctotheca calendulaCapeweed15055
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Wednesday, May 24, 2017 .  Available  www.weedscience.org
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