International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
MULTIPLE RESISTANT GREATER BEGGARTICKS
(Bidens subalternans)


Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)

Brazil, Paraná
INTRODUCTION GREATER BEGGARTICKS
Greater Beggarticks (Bidens subalternans) is a dicot weed in the Asteraceae family.  In Brazil this weed first evolved multiple resistance (to 2 herbicide sites of action) in 2006 and infests Corn (maize).  Multiple resistance has evolved to herbicides in the Groups B/2, and C1/5.  These particular biotypes are known to have resistance to atrazine, foramsulfuron, and iodosulfuron-methyl-sodium and they may be cross-resistant to other herbicides in the Groups B/2, and C1/5.

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 03, 2009 )

Common NameGreater Beggarticks
SpeciesBidens subalternans
GroupALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
Herbicidesatrazine, foramsulfuron, and iodosulfuron-methyl-sodium
LocationBrazil, Paraná
Year2006
Situation(s)Corn (maize)
Contributors - (Alphabetically)Fernando Adegas, and Dionisio Gazziero 
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ACADEMIC ASPECTS

Confirmation Tests

Field, and Greenhouse trials comparing a known susceptible Greater Beggarticks biotype with this Greater 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 B, C1/2, 5 resistant Greater 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

Researchers have indicated that Group B, C1/2, 5 resistant Greater Beggarticks is ecologically less fit than normal susceptible Greater Beggarticks.  There may be a note below or an article discussing the fitness of this biotype in the Fact Sheets and Other Literature
 
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CONTRIBUTING WEED SCIENTISTS

FERNANDO ADEGAS
Weed Scientist
Embrapa Soja
Weed Management
Rod. Carlos Joao Strass
Ac. Orlando Amaral. PO Box 231
Londrina, 86001-970, Paraná
Brazil
Email Fernando Adegas
Web   : Web Site Link
DIONISIO GAZZIERO
Research Associate
Embrapa
Soja
5825 South Bend Rd
86001-970 Londrina-Pr, 86001-970, Paraná
Brazil
Email Dionisio Gazziero
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Brazil have been instrumental in providing you this information. Particular thanks is given to Fernando Adegas, and Dionisio Gazziero for providing detailed information.
Herbicide Resistant Greater Beggarticks Globally
(Bidens subalternans)
Herbicide Resistant Greater Beggarticks Globally
(Bidens subalternans)
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Herbicide Resistant Greater Beggarticks Globally
(Bidens subalternans)
#CountryFirstYearSituationActive IngredientsSite of Action
1 BrazilBrazil 1996 Soybean chlorimuron-ethyl, imazethapyr, and nicosulfuron 5 ALS inhibitors (B/2)
194Bidens subalternansGreater Beggarticks1195
2 BrazilBrazil 2006 Corn (maize) atrazine, foramsulfuron, and iodosulfuron-methyl-sodium 5 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
Photosystem II inhibitors (C1/5)
194Bidens subalternansGreater Beggarticks5382
3 ParaguayParaguay 2018 Soybean glyphosate 46 EPSP synthase inhibitors (G/9)
194Bidens subalternansGreater Beggarticks17150
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Saturday, December 14, 2019 .  Available  www.weedscience.org
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