International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP B/2 RESISTANT WILD POINSETTIA
(Euphorbia heterophylla)


ALS inhibitors (B/2)

Brazil, Rio Grande do Sul, Paraná
INTRODUCTION WILD POINSETTIA
Wild Poinsettia (Euphorbia heterophylla) is a dicot weed in the Euphorbiaceae family.  In Brazil this weed first evolved resistance to Group B/2 herbicides in 1993 and infests 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 chlorimuron-ethyl, cloransulam-methyl, imazamox, imazaquin, and imazethapyr 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 May 29, 2014 )

Common NameWild Poinsettia
SpeciesEuphorbia heterophylla
GroupALS inhibitors (B/2)
Herbicideschlorimuron-ethyl, cloransulam-methyl, imazamox, imazaquin, and imazethapyr
LocationBrazil, Rio Grande do Sul, Paraná
Year1993
Situation(s)Soybean
Contributors - (Alphabetically)Marcio Adoryan, Rafael De Prado, Gerson Gelmini, Maria Novo, Juan Pedro Ruiz-Santaella, Ricardo Victória, and Ribas Vidal 
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ACADEMIC ASPECTS

Confirmation Tests

Field, Greenhouse, and Laboratory trials comparing a known susceptible Wild Poinsettia biotype with this Wild Poinsettia 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 Wild Poinsettia 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

Studies on the mechanism of resistance of Group B/2 resistant Wild Poinsettia from Brazil indicate that resistance is due to an altered target site.  There may be a note below or an article discussing the mechanism of resistance in the Fact Sheets and Other Literature
 
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 Wild Poinsettia from Brazil please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

MARCIO ADORYAN
Head of Early Development and Resistance Management
Bayer Cropscience
Agronomic Development
Rod. Doutor Roberto Moreira
5005 – EAE - CEAT
Paulinia, 13148-914, São Paulo
Brazil
Email Marcio Adoryan
RAFAEL DE PRADO
Head of Early Development and Resistance Management
Universidad De Cordoba
Qvimica Agricola Y Edafologa
E T S Ingenieros Agronomos
PO Box 119
Cordoba, E-14080, Andalusia
Spain
Email Rafael De Prado
GERSON GELMINI
Head of Early Development and Resistance Management
Universidad De Cordoba
Qvimica Agricola Y Edafologa
E T S Ingenieros Agronomos
945 Marion Street
Cordoba, E-14080, Andalusia
Brazil
Email Gerson Gelmini
MARIA NOVO
Head of Early Development and Resistance Management
Universidad De Cordoba
Qvimica Agricola Y Edafologa
E T S Ingenieros Agronomos
Department of Crop& Soil Sciences
115 Coastal Way, PO Box 748
Cordoba, E-14080, Andalusia
Brazil
Email Maria Novo
JUAN PEDRO RUIZ-SANTAELLA
Research Associate
University Of Córdoba
Department Of Agricultural Chemistry
233 Funchess Hall
Córdoba, 14071, Andalusia
Spain
Email Juan Pedro Ruiz-Santaella
Web   : Web Site Link
RICARDO VICTÓRIA
Research Associate
University Of Córdoba
Department Of Agricultural Chemistry
Dept of Plant Sciences
Córdoba, 14071, Andalusia
Brazil
Email Ricardo Victória
Web   : Web Site Link
RIBAS VIDAL
Professor
Universidade Federal Do Rio Grande Do Sul
Plant Sciences
Rod. Carlos João Strass
Acesso Orlando, Cx Postal 231,
Porto Alegre, CEP 91001-970, RS
Brazil
Email Ribas Vidal
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 Marcio Adoryan, Rafael De Prado, Gerson Gelmini, Maria Novo, Juan Pedro Ruiz-Santaella, Ricardo Victória, and Ribas Vidal for providing detailed information.
Herbicide Resistant Wild Poinsettia Globally
(Euphorbia heterophylla)
Herbicide Resistant Wild Poinsettia Globally
(Euphorbia heterophylla)
Drag a column header and drop it here to group by that column
Herbicide Resistant Wild Poinsettia Globally
(Euphorbia heterophylla)
#CountryFirstYearSituationActive IngredientsSite of Action
1 BrazilBrazil 1993 Soybean chlorimuron-ethyl, cloransulam-methyl, imazamox, imazaquin, and imazethapyr 5 ALS inhibitors (B/2)
87Euphorbia heterophyllaWild Poinsettia5294
2 BrazilBrazil 2004 Corn (maize), and Soybean acifluorfen-sodium, cloransulam-methyl, diclosulam, flumetsulam, flumiclorac-pentyl, fomesafen, imazethapyr, lactofen, metsulfuron-methyl, nicosulfuron, and saflufenacil 5 Multiple Resistance: 2 Sites of Action
ALS inhibitors (B/2)
PPO inhibitors (E/14)
87Euphorbia heterophyllaWild Poinsettia5215
3 EcuadorEcuador 1990 Corn (maize), and Soybean linuron 14 PSII inhibitor (Ureas and amides) (C2/7)
87Euphorbia heterophyllaWild Poinsettia87
4 ParaguayParaguay 1995 Soybean imazethapyr 46 ALS inhibitors (B/2)
87Euphorbia heterophyllaWild Poinsettia1162
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