International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP C1/5 RESISTANT BUR BEGGARTICKS
(Bidens tripartita)


Photosystem II inhibitors (C1/5)

Austria
INTRODUCTION BUR BEGGARTICKS
Bur Beggarticks (Bidens tripartita) is a dicot weed in the Asteraceae family.  In Austria this weed first evolved resistance to Group C1/5 herbicides in 1979 and infests Corn (maize).   Group C1/5 herbicides are known as Photosystem II inhibitors (Inhibition of photosynthesis at photosystem II).  Research has shown that these particular biotypes are resistant to atrazine and they may be cross-resistant to other Group C1/5 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 Sep 15, 2000 )

Common NameBur Beggarticks
SpeciesBidens tripartita
GroupPhotosystem II inhibitors (C1/5)
Herbicidesatrazine
LocationAustria
Year1979
Situation(s)Corn (maize)
Contributors - (Alphabetically) 
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NOTES ABOUT THIS BIOTYPE

GENERAL

Resistant to 5 kg/ha.

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GENERAL

R. Szith and H. Furlan (1979). Der dreiteilige zweizahn (Bidens tripartita, L.) ein neues atrazinresistentes unkraut im mais, Der Pflanzenarzt, 32, 6.

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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Bur Beggarticks biotype with this Bur Beggarticks 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 C1/5 resistant Bur Beggarticks 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

Triazine resistant weeds often exhibit a lower relative fitness when compared to susceptible biotypes.  The most common mutation conferring triazine resistance (Ser 264 to Gly mutation of the psbA gene) also causes a reduction in CO2 fixation, quantum yield, and seed and biomass production.  There is no record in this database referring specifically to fitness studies on Group C1/5 resistant Bur Beggarticks from Austria.
 
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CONTRIBUTING WEED SCIENTISTS


ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Austria have been instrumental in providing you this information. 
Herbicide Resistant Bur Beggarticks Globally
(Bidens tripartita)
Herbicide Resistant Bur Beggarticks Globally
(Bidens tripartita)
Drag a column header and drop it here to group by that column
Herbicide Resistant Bur Beggarticks Globally
(Bidens tripartita)
#CountryFirstYearSituationActive IngredientsSite of Action
1 AustriaAustria 1979 Corn (maize) atrazine 2 Photosystem II inhibitors (C1/5)
33Bidens tripartitaBur Beggarticks287
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Thursday, June 20, 2019 .  Available  www.weedscience.org
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