HRAC GROUP 2 (LEGACY B) RESISTANT PATERSONS CURSE
(Echium plantagineum)

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Brazil, Rio Grande du Sol

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INTRODUCTION PATERSONS CURSE Patersons Curse (Echium plantagineum) is a dicot weed in the Boraginaceae family.  In Brazil this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2015 and infests Cereals, and 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 metsulfuron-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.

QUIK STATS (last updated Apr 18, 2016 ) Common Name Patersons Curse Species Echium plantagineum Group Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B) Herbicides metsulfuron-methyl Location Brazil, Rio Grande du Sol Year 2015 Situation(s) Cereals, and Wheat Contributors - (Alphabetically) Mauro Rizzardi, and Sabrina Tolotti Peruzzo  Edit this Case  |  Add New Case of Resistance  |  Add Note

ACADEMIC ASPECTS Confirmation Tests Greenhouse, and Laboratory trials comparing a known susceptible Patersons Curse biotype with this Patersons Curse 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 Patersons Curse 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 2 (Legacy B) resistant Patersons Curse from Brazil please update the database.   Edit Case  |  Add Note  |  Add Article  |  Add New Case  |  Help

CONTRIBUTING WEED SCIENTISTS MAURO RIZZARDI Professor Universidade De Passo Fundo Crop Science 3713 Whispering Lane Passo Fundo, 99010110, Rio Grande Do Sul Brazil Email Mauro Rizzardi SABRINA TOLOTTI PERUZZO Graduate Student Universidade De Passo Fundo Crop Science Avenida Brazil 894 Passo Fundo, 99025003, Rio Grande do Sul Brazil Email Sabrina Tolotti Peruzzo

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 Mauro Rizzardi, and Sabrina Tolotti Peruzzo for providing detailed information.

Herbicide Resistant Patersons Curse Globally (Echium plantagineum) Herbicide Resistant Patersons Curse Globally (Echium plantagineum) Drag a column header and drop it here to group by that column Herbicide Resistant Patersons Curse Globally (Echium plantagineum) # Country Country StateName FirstYear Situation Active Ingredients CountryID Site of Action WeedID Species CommonName ResistID 1 Australia (South Australia) Australia South Australia 1997 Cereals, and Pastures chlorsulfuron, and metosulam 1 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B) 186 Echium plantagineum Patersons Curse 1136 2 Australia (Western Australia) Australia Western Australia 1997 Cereals chlorsulfuron 1 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B) 186 Echium plantagineum Patersons Curse 5030 3 Brazil Brazil   2015 Cereals, and Wheat metsulfuron-methyl 5 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B) 186 Echium plantagineum Patersons Curse 12033

Literature about Similar Cases

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Preston, C.. 2006. Resistance to acetolactate synthase-inhibiting herbicides in Echium plantagineum L. : 530 - 533.

Echium plantagineum L. is a major weed of pastures in southern Australia. It can be problematic to control as it has a large seed bank and often establishes on early autumn rains. Metsulfuron-methyl can be used to selectively control E. plantagineum in grass pastures. In 1997, following seven applications of metsulfuron-methyl to a horse-agistment pasture near in South Australia, failure to control E. plantagineum was observed. Dose response experiments conducted with a range of sulfonylurea herbicides demonstrated this population was highly resistant to the sulfonylurea herbicides metsulfuron-methyl, chlorsulfuron, triasulfuron and sulfometuron-methyl when compared with a susceptible population. The resistant population also had low-level resistance to the imidazolinone herbicides, imazapyr and imazethapyr. Acetolactate synthase (ALS) enzyme assays were conducted using isolated leaf chloroplasts as the source of ALS enzyme. These assays demonstrated that the enzyme from resistant plants was very highly resistant, >30-fold, to all sulfonylurea herbicides when tested in vivo. The isolated ALS was also resistant to the sulfonamide herbicide flumetsulam, but had low-level resistance to the imidazolinone herbicides. Resistance to ALSinhibiting herbicides in E. plantagineum is the result of an insensitive target enzyme..

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