INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

HRAC GROUP 2 (LEGACY B) RESISTANT CORN POPPY
(Papaver rhoeas)


Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Portugal, Lower Alentejo
INTRODUCTION CORN POPPY
Corn Poppy (Papaver rhoeas) is a dicot weed in the Papaveraceae family.  In Portugal this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2018 and infests Wheat.   Group 2 (Legacy B) herbicides are known as Inhibition of Acetolactate Synthase (Inhibition of Acetolactate Synthase ).  Research has shown that these particular biotypes are resistant to tribenuron-methyl and they may be cross-resistant to other Group 2 (Legacy B) 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 Mar 05, 2024 )

Common NameCorn Poppy
SpeciesPapaver rhoeas
GroupInhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)
Herbicidestribenuron-methyl
LocationPortugal, Lower Alentejo
Year2018
Situation(s)Wheat
Contributors - (Alphabetically)Isabel Calha 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible Corn Poppy biotype with this Corn Poppy 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 2 resistant Corn Poppy 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 2 (Legacy B) resistant Corn Poppy from Portugal 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 2 (Legacy B) resistant Corn Poppy from Portugal please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

ISABEL CALHA
Instituto Nacional De Recursos Biológicos, Ip (inrb I.p. )
Laboratório Nacional De Investigação Agrária (linia)
Unidade De Investigação De Protecção De Plantas (uipp)
Dept of Agronomy& Plant Genetics
411 Borlaug Hall, 1991 Upper Buford Circle
Oeiras, 2784-505
Portugal
Email Isabel Calha

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Portugal have been instrumental in providing you this information. Particular thanks is given to Isabel Calha for providing detailed information.
Herbicide Resistant Corn Poppy Globally
(Papaver rhoeas)
Herbicide Resistant Corn Poppy Globally
(Papaver rhoeas)
Drag a column header and drop it here to group by that column
Herbicide Resistant Corn Poppy Globally
(Papaver rhoeas)
#CountryFirstYearSituationActive IngredientsSite of Action
1 BelgiumBelgium 2014 Wheat florasulam, and metsulfuron-methyl 3 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
123Papaver rhoeasCorn Poppy10960
2 DenmarkDenmark 2003 Wheat florasulam, iodosulfuron-methyl-Na, and tribenuron-methyl 13 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
123Papaver rhoeasCorn Poppy5346
3 FranceFrance 2007 Wheat iodosulfuron-methyl-Na, mesosulfuron-methyl, and metsulfuron-methyl 17 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
123Papaver rhoeasCorn Poppy5517
4 FranceFrance 2015 Wheat 2,4-D, and aminopyralid 17 Auxin Mimics ( HRAC Group 4 (Legacy O)
123Papaver rhoeasCorn Poppy18176
5 FranceFrance 2016 Cereals 2,4-D, aminopyralid, iodosulfuron-methyl-Na, MCPA, mesosulfuron-methyl, and metsulfuron-methyl 17 Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
Auxin Mimics ( HRAC Group 4 (Legacy O)
123Papaver rhoeasCorn Poppy15054
6 GermanyGermany 2012 Cereals, and Rapeseed florasulam, and imazamox 18 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
123Papaver rhoeasCorn Poppy6743
7 GreeceGreece 1998 Winter wheat chlorsulfuron, florasulam, imazamox, pyrithiobac-sodium, thifensulfuron-methyl, triasulfuron, and tribenuron-methyl 19 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
123Papaver rhoeasCorn Poppy1142
8 GreeceGreece 2002 Wheat 2,4-D, iodosulfuron-methyl-Na, and mesosulfuron-methyl 19 Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
Auxin Mimics ( HRAC Group 4 (Legacy O)
123Papaver rhoeasCorn Poppy18174
9 ItalyItaly 1998 Durum wheat florasulam, iodosulfuron-methyl-Na, and tribenuron-methyl 24 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
123Papaver rhoeasCorn Poppy1140
10 ItalyItaly 1998 Wheat 2,4-D, iodosulfuron-methyl-Na, and tribenuron-methyl 24 Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
Auxin Mimics ( HRAC Group 4 (Legacy O)
123Papaver rhoeasCorn Poppy5679
11 ItalyItaly 1998 Wheat 2,4-D 24 Auxin Mimics ( HRAC Group 4 (Legacy O)
123Papaver rhoeasCorn Poppy5680
12 PolandPoland 2014 Winter wheat tribenuron-methyl 33 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
123Papaver rhoeasCorn Poppy10983
13 PortugalPortugal 2018 Wheat 2,4-D, and tribenuron-methyl 34 Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
Auxin Mimics ( HRAC Group 4 (Legacy O)
123Papaver rhoeasCorn Poppy28267
14 PortugalPortugal 2018 Wheat tribenuron-methyl 34 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
123Papaver rhoeasCorn Poppy28271
15 SpainSpain 1993 Cereals, and Wheat 2,4-D, and tribenuron-methyl 38 Multiple Resistance: 2 Sites of Action
Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
Auxin Mimics ( HRAC Group 4 (Legacy O)
123Papaver rhoeasCorn Poppy185
16 SwedenSweden 2011 Winter wheat amidosulfuron, iodosulfuron-methyl-Na, and propoxycarbazone-Na 40 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
123Papaver rhoeasCorn Poppy8913
17 United KingdomUnited Kingdom 2001 Cereals metsulfuron-methyl 44 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B)
123Papaver rhoeasCorn Poppy5169
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