International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP B/2 RESISTANT TROPICAL WHITEWEED
(Ageratum conyzoides)


ALS inhibitors (B/2)

Brazil, Matto Grosso
INTRODUCTION TROPICAL WHITEWEED
Tropical Whiteweed (Ageratum conyzoides) is a dicot weed in the Asteraceae family.  In Brazil this weed first evolved resistance to Group B/2 herbicides in 2013 and infests Cotton, and Soybean.   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 pyrithiobac-sodium, and trifloxysulfuron-sodium 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 Jan 12, 2015 )

Common NameTropical Whiteweed
SpeciesAgeratum conyzoides
GroupALS inhibitors (B/2)
Herbicidespyrithiobac-sodium, and trifloxysulfuron-sodium
LocationBrazil, Matto Grosso
Year2013
Situation(s)Cotton, and Soybean
Contributors - (Alphabetically)Edson Andrade Junior, Sebastião Carneiro Guimarães, and Anderson Luis Cavenaghi 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Tropical Whiteweed biotype with this Tropical Whiteweed 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 Tropical Whiteweed 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 Tropical Whiteweed from Brazil please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

EDSON ANDRADE JUNIOR
Research
Instituto Mato-Grossense do Algodão
Crop Protection
Highway BR 070 KM 265 post office box 149
Primavera do Leste, 78850000, Mato Grosso
Brazil
Email Edson Andrade Junior
Web   : Web Site Link
SEBASTIÃO CARNEIRO GUIMARÃES
Associate Professor
Universidade Federal de Mato Grosso
Faculdade de Agronomia
Av. Fernando Correa da Costa 2367
Bairro Boa Esperança
Cuiabá, 78850000, Mato Grosso
Brazil
Email Sebastião Carneiro Guimarães
Web   : Web Site Link
ANDERSON LUIS CAVENAGHI
Associate Professor
UNIVAG – Centro Universitário de Várzea Grande
GPA CABE AGRONOMIA
Av. Dom Orlando Chaves
2.655, Bairro Cristo Rei
Várzea Grande, 78850000, Matto Grosso
Brazil
Email Anderson Luis Cavenaghi
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 Edson Andrade Junior, Sebastião Carneiro Guimarães, and Anderson Luis Cavenaghi for providing detailed information.
Herbicide Resistant Tropical Whiteweed Globally
(Ageratum conyzoides)
Herbicide Resistant Tropical Whiteweed Globally
(Ageratum conyzoides)
Drag a column header and drop it here to group by that column
Herbicide Resistant Tropical Whiteweed Globally
(Ageratum conyzoides)
#CountryFirstYearSituationActive IngredientsSite of Action
1 BrazilBrazil 2013 Cotton, and Soybean pyrithiobac-sodium, and trifloxysulfuron-sodium 5 ALS inhibitors (B/2)
319Ageratum conyzoidesTropical Whiteweed9947
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Friday, September 20, 2019 .  Available  www.weedscience.org
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