HRAC GROUP 9 (LEGACY G) RESISTANT RESCUEGRASS
(Bromus catharticus)

Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G)

Argentina, Buenos Aires Province

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INTRODUCTION RESCUEGRASS Rescuegrass (Bromus catharticus) is a monocot weed in the Poaceae family.  In Argentina this weed first evolved resistance to Group 9 (Legacy G) herbicides in 2017 and infests Fallow, Wheat, and Winter barley.   Group 9 (Legacy G) herbicides are known as Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (Inhibition of EPSP synthase).  Research has shown that these particular biotypes are resistant to glyphosate and they may be cross-resistant to other Group 9 (Legacy G) 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 02, 2018 ) Common Name Rescuegrass Species Bromus catharticus Group Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G) Herbicides glyphosate Location Argentina, Buenos Aires Province Year 2017 Situation(s) Fallow, Wheat, and Winter barley Contributors - (Alphabetically) Marcos Yanniccari  Edit this Case  |  Add New Case of Resistance  |  Add Note

ACADEMIC ASPECTS Confirmation Tests Greenhouse trials comparing a known susceptible Rescuegrass biotype with this Rescuegrass 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 9 resistant Rescuegrass 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 9 (Legacy G) resistant Rescuegrass from Argentina please update the database.   Edit Case  |  Add Note  |  Add Article  |  Add New Case  |  Help

CONTRIBUTING WEED SCIENTISTS MARCOS YANNICCARI Dr CONICET Chacra Experimental Integrada Barrow RN 3 km 487 cc 50 Tres Arroyos, 7500, Buenos Aires Argentina Email Marcos Yanniccari

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

Herbicide Resistant Rescuegrass Globally (Bromus catharticus) Herbicide Resistant Rescuegrass Globally (Bromus catharticus) Drag a column header and drop it here to group by that column Herbicide Resistant Rescuegrass Globally (Bromus catharticus) # Country Country StateName FirstYear Situation Active Ingredients CountryID Site of Action WeedID Species CommonName ResistID 1 Argentina Argentina   2017 Fallow, Wheat, and Winter barley glyphosate 48 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G) 338 Bromus catharticus Rescuegrass 17144

Literature about Similar Cases

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Rolston, M. P. ; Archie, W.. 1999. Wild oat control and tolerance of grass seed crops to fenoxaprop-P-ethyl. Proceedings of the Fifty Second New Zealand Plant Protection Conference, Auckland Airport Centra, Auckland, New Zealand, 10-12 August, 1999 : 218 - 222.

Three field experiments were conducted in New Zealand. In the first trial (1995), Fenoxaprop P-ethyl [fenoxaprop-P], a wild oat (Avena sativa) herbicide, was applied to five grass species (Lolium perenne cv. Grasslands Nui, L. multiflorum cv. Concord, Bromus willdenowii [B. catharticus] cv. Grasslands Matua, Bromus stamineus cv. Grasslands Gala and Phalaris aquatica cv. Grasslands Maru). L. perenne was tolerant to 37 g/ha, but there was a trend for a reduction in seed yield at 75 g/ha. The two Bromus species had good tolerance, but P. aquatica seed yields were reduced by 80%. In the second trial (1996-97), fenoxaprop P-ethyl applied at 56 g/ha had no significant effect on seed yield of perennial and hybrid ryegrass cultivars (Yatsyn and Grasslands Impact, respectively). However, there was a trend for 75 g/ha to reduce seed yield in the perennial ryegrass. In the third experiment (1997) involving L. perenne cv. Verdette, wild oats were very competitive, reducing seed yields from 2600 kg/ha (best herbicide treatment) to 660 kg/ha in the untreated control. Excellent wild oat control was achieved with fenoxaprop P-ethyl at rates of 45 g/ha in August and 56 g/ha in September..

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