HRAC GROUP 2 (LEGACY B) RESISTANT MARSHELDER
(Iva xanthiifolia)

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

United States, North Dakota

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INTRODUCTION MARSHELDER Marshelder (Iva xanthiifolia) is a dicot weed in the Asteraceae family.  In North Dakota this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2003 and infests Soybean.   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, and 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.

QUIK STATS (last updated Feb 01, 2005 ) Common Name Marshelder Species Iva xanthiifolia Group Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B) Herbicides imazamox, and tribenuron-methyl Location United States, North Dakota Year 2003 Situation(s) Soybean Contributors - (Alphabetically) Kirk Howatt  Edit this Case  |  Add New Case of Resistance  |  Add Note

ACADEMIC ASPECTS Confirmation Tests Greenhouse trials comparing a known susceptible Marshelder biotype with this Marshelder 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 Marshelder 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 Marshelder from North Dakota please update the database.   Edit Case  |  Add Note  |  Add Article  |  Add New Case  |  Help

CONTRIBUTING WEED SCIENTISTS KIRK HOWATT Associate Professor North Dakota State University Department of Plant Sciences Loftsgard Hall 470F Fargo, 58108-6050, North Dakota United States Email Kirk Howatt Web   : Web Site Link

ACKNOWLEDGEMENTS The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in North Dakota have been instrumental in providing you this information. Particular thanks is given to Kirk Howatt for providing detailed information.

Herbicide Resistant Marshelder Globally (Iva xanthiifolia) Herbicide Resistant Marshelder Globally (Iva xanthiifolia) Drag a column header and drop it here to group by that column Herbicide Resistant Marshelder Globally (Iva xanthiifolia) # Country Country StateName FirstYear Situation Active Ingredients CountryID Site of Action WeedID Species CommonName ResistID 1 United States (North Dakota) United States North Dakota 2003 Soybean imazamox, and tribenuron-methyl 45 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B) 229 Iva xanthiifolia Marshelder 5236

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