<b>HRAC Group 5</b> <font size='2'> (Legacy C1 C2) </font> resistant Bidens tripartita from Austria

INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

HRAC GROUP 5 (LEGACY C1 C2) RESISTANT BUR BEGGARTICKS
(Bidens tripartita)

PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)

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 5 (Legacy C1 C2) herbicides in 1979 and infests Corn (maize). Group 5 (Legacy C1 C2) herbicides are known as PSII inhibitors - Serine 264 Binders (Inhbition of Photosynthesis at PSll - Serine 264 Binders ). Research has shown that these particular biotypes are resistant to atrazine and they may be cross-resistant to other Group 5 (Legacy C1 C2) 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.

QUIK STATS (last updated Sep 15, 2000 )
Common Name	Bur Beggarticks
Species	Bidens tripartita
Group	PSII inhibitors - Serine 264 Binders HRAC Group 5 (Legacy C1 C2)
Herbicides	atrazine
Location	Austria
Year	1979
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 HRAC Group 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

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 5 (Legacy C1 C2) resistant Bur Beggarticks from Austria please update the database.

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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.

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Herbicide Resistant Bur Beggarticks Globally
(Bidens tripartita)

Country

FirstYear

Situation

Active Ingredients

Site of Action

Austria

1979

Corn (maize)

atrazine

PSII inhibitors - Serine 264 Binders ( HRAC Group 5 (Legacy C1 C2)

Literature about Similar Cases

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Rho, Y. D. ; Matsumoto, H. ; Usui, K. ; Ishizuka, K.. 1996. Involvement of foliar absorption and translocation in differential response between Bidens tripartita and B. frondosa to bensulfuron methyl. Weed Research, Japan 41 : 211 - 215.

The response of two Bidens species (B. tripartita and B. frondosa) to bensulfuron-methyl was compared and factors accounting for their differential response were investigated. A greenhouse experiment showed that B. tripartita had greater tolerance to the herbicide than B. frondosa, although the latter had moderate tolerance which was comparable to that of barnyardgrass (Echinochloa crus-galli). Absorption of ¹⁴C from above-ground (shoot) tissue following ¹⁴C-bensulfuron methyl application was more rapid in B. frondosa than in B. tripartita. Absorption from the cotyledon was also much greater in B. frondosa, and absorbed ¹⁴C was distributed throughout the shoots of the species. Differential foliar absorption and translocation between the Bidens species may partly explain their differential response to bensulfuron-methyl..

Bachthaler, G. ; Kees, H. ; Dinzenhofer, B.. 1983. The build-up of resistant lines of arable weeds after continued use of herbicides, especialy triazines. Present state of knowledge of causes and practical consequences. Nachrichtenblatt des Deutschen Pflanzenschutzdienstes 35 : 161 - 168.

Factors influencing the build-up of resistance to triazines are reviewed with reference to Senecio vulgaris, Chenopodium spp., Amaranthus spp., Ambrosia artemisifolia, Brassica campestris, Stellaria media, Solanum nigrum, Polygonum spp., Galinsoga ciliata, Bidens tripartita, Erigeron canadensis and Cirsium arvense..

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