HRAC GROUP 2 (LEGACY B) RESISTANT ENGLISH CATCHFLY
(Silene gallica)

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Chile, La Araucanía

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INTRODUCTION ENGLISH CATCHFLY English Catchfly (Silene gallica) is a dicot weed in the Caryophyllaceae family.  In Chile this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2012 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 imazamox, imazapyr, iodosulfuron-methyl-Na, metsulfuron-methyl, and pyroxsulam 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 Jul 06, 2012 ) Common Name English Catchfly Species Silene gallica Group Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B) Herbicides imazamox, imazapyr, iodosulfuron-methyl-Na, metsulfuron-methyl, and pyroxsulam Location Chile, La Araucanía Year 2012 Situation(s) Wheat Contributors - (Alphabetically) Nelson Espinoza, and Cristian Rodriguez  Edit this Case  |  Add New Case of Resistance  |  Add Note

ACADEMIC ASPECTS Confirmation Tests Field, and Greenhouse trials comparing a known susceptible English Catchfly biotype with this English Catchfly 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 English Catchfly 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 English Catchfly from Chile please update the database.   Edit Case  |  Add Note  |  Add Article  |  Add New Case  |  Help

CONTRIBUTING WEED SCIENTISTS NELSON ESPINOZA Investigador Malherbología Inia-Carillanca Producción Vegetal USDA-ARS, 302 Natural Resources Bldg Cropping Systems& Water Quality Temuco Chile Email Nelson Espinoza Web   : Web Site Link CRISTIAN RODRIGUEZ Agronomist Inia-Carillanca Producción Vegetal USDA-ARS, 302 Natural Resources Bldg Cropping Systems& Water Quality Temuco Chile Email Cristian Rodriguez Web   : Web Site Link

ACKNOWLEDGEMENTS The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Chile have been instrumental in providing you this information. Particular thanks is given to Nelson Espinoza, and Cristian Rodriguez for providing detailed information.

Herbicide Resistant English Catchfly Globally (Silene gallica) Herbicide Resistant English Catchfly Globally (Silene gallica) Drag a column header and drop it here to group by that column Herbicide Resistant English Catchfly Globally (Silene gallica) # Country Country StateName FirstYear Situation Active Ingredients CountryID Site of Action WeedID Species CommonName ResistID 1 Chile Chile   2012 Wheat imazamox, imazapyr, iodosulfuron-methyl-Na, metsulfuron-methyl, and pyroxsulam 8 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B) 279 Silene gallica English Catchfly 5664

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