International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP O/4 RESISTANT WILD CARROT
(Daucus carota)


Synthetic Auxins (O/4)

Canada, Ontario
INTRODUCTION WILD CARROT
Wild Carrot (Daucus carota) is a dicot weed in the Apiaceae family.  In Ontario this weed first evolved resistance to Group O/4 herbicides in 1957 and infests Roadsides.   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 Feb 05, 2002 )

Common NameWild Carrot
SpeciesDaucus carota
GroupSynthetic Auxins (O/4)
Herbicides2,4-D
LocationCanada, Ontario
Year1957
Situation(s)Roadsides
Contributors - (Alphabetically)Chris Hall, and Clarence Swanton 
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NOTES ABOUT THIS BIOTYPE

GENERAL

Clarence Swanton
Whitehead, C. W., and C. M. Switzer. 1963. The differential response of strains of wild carrot to 2,4-D and related herbicides. Canadian Journal of Plant Science. 43 (3) : 255-262. Also Switzer, C.M. 1957. The existence of 2,4-D resistant strains of wild carrot. Proc. N.E.W.C.C. 11:315-318.

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GENERAL

Hugh Beckie
L. L. Van Eerd, G. R. Stephenson, and J. C. Hall. 2000. 2,4-D resistance in wild carrot (Daucus carota). Weed Sci. Soc. Am. Abstr. 40:64.

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HISTORY - FIRST CASE

Shane Friesen
2,4-D resistant wild carrot populations were first reported by Switzer in 1957 (see Switzer, C.M., 1957. The existence of 2,4-D resistant wild carrot. Proc. N.C.W.C.C. 9:75-77).

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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Wild Carrot biotype with this Wild Carrot 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 Wild Carrot 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 Wild Carrot from Ontario please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

CHRIS HALL
University Of Guelph
Department Of Environmental Biology
Dept. Producao Vegetal
Caixa Postal 09, Av. Padua Dias 11
Guelph, N1G 2W1, Ontario
Canada
Email Chris Hall
CLARENCE SWANTON
University Of Guelph
Dept. Of Crop Science
Ontario Agricultural College
PO Box 249
Guelph, N1G 2W1, Ontario
Canada
Email Clarence Swanton

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Ontario have been instrumental in providing you this information. Particular thanks is given to Chris Hall, and Clarence Swanton for providing detailed information.
Herbicide Resistant Wild Carrot Globally
(Daucus carota)
Herbicide Resistant Wild Carrot Globally
(Daucus carota)
Drag a column header and drop it here to group by that column
Herbicide Resistant Wild Carrot Globally
(Daucus carota)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Canada (Ontario) CanadaOntario1957 Roadsides 2,4-D 7 Synthetic Auxins (O/4)
76Daucus carotaWild Carrot307
2 United States (Michigan) United StatesMichigan1993 Cropland, and Roadsides 2,4-D 45 Synthetic Auxins (O/4)
76Daucus carotaWild Carrot505
3 United States (Ohio) United StatesOhio1994 Soybean 2,4-D 45 Synthetic Auxins (O/4)
76Daucus carotaWild Carrot5234
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