International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP B/2 RESISTANT AFRICAN TURNIPWEED
(Sisymbrium thellungii)


ALS inhibitors (B/2)

Australia, Queensland
INTRODUCTION AFRICAN TURNIPWEED
African Turnipweed (Sisymbrium thellungii) is a dicot weed in the Brassicaceae family.  In Queensland this weed first evolved resistance to Group B/2 herbicides in 1996 and infests Cereals, and Wheat.   Group B/2 herbicides are known as ALS inhibitors (Inhibition of acetolactate synthase ALS (acetohydroxyacid synthase AHAS)).  Research has shown that these particular biotypes are resistant to chlorsulfuron and they may be cross-resistant to other Group B/2 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 NameAfrican Turnipweed
SpeciesSisymbrium thellungii
GroupALS inhibitors (B/2)
Herbicideschlorsulfuron
LocationAustralia, Queensland
Year1996
Situation(s)Cereals, and Wheat
Contributors - (Alphabetically)Steve Walker 
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NOTES ABOUT THIS BIOTYPE

AREAS FOUND

Steve Walker
Found in southern Queensland.

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GENERAL

Steve Walker
Herbicide usage records showed that resistance has developed after 3-10 years of selection with chlorsulfuron with no correlation between the frequency of use and the degree of resistance for any of the species where eight or more collections were made.

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GENERAL

Steve Walker
Weeds resistant to chlorsulfuron and atrazine from the north-east grain region of Australia. (Weed Research, Adkins et al. 1997).

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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible African Turnipweed biotype with this African Turnipweed 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 B/2 resistant African Turnipweed 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 B/2 resistant African Turnipweed from Queensland please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

STEVE WALKER
Principal Agronomist
Farming Systems Institute, Qdpi
Leslie Research Centre
303 North Roberts
PO Box 200201,
Toowoomba, 4350, Queensland
Australia
Email Steve Walker

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Queensland have been instrumental in providing you this information. Particular thanks is given to Steve Walker for providing detailed information.
Herbicide Resistant African Turnipweed Globally
(Sisymbrium thellungii)
Herbicide Resistant African Turnipweed Globally
(Sisymbrium thellungii)
Drag a column header and drop it here to group by that column
Herbicide Resistant African Turnipweed Globally
(Sisymbrium thellungii)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Australia (Queensland) AustraliaQueensland1996 Cereals, and Wheat chlorsulfuron 1 ALS inhibitors (B/2)
160Sisymbrium thellungiiAfrican Turnipweed529
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Wednesday, November 13, 2019 .  Available  www.weedscience.org
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