HRAC GROUP 9 (LEGACY G) RESISTANT ARROCILLO
(Paspalum paniculatum)

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

Costa Rica, Limón, Alajuela

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INTRODUCTION ARROCILLO Arrocillo (Paspalum paniculatum) is a monocot weed in the Poaceae family.  In Costa Rica this weed first evolved resistance to Group 9 (Legacy G) herbicides in 2010 and infests Banana and Plantain, and Pejibaye palm.   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 Aug 31, 2017 ) Common Name Arrocillo Species Paspalum paniculatum Group Inhibition of Enolpyruvyl Shikimate Phosphate Synthase HRAC Group 9 (Legacy G) Herbicides glyphosate Location Costa Rica, Limón, Alajuela Year 2010 Situation(s) Banana and Plantain, and Pejibaye palm Contributors - (Alphabetically) Bernal Valverde  Edit this Case  |  Add New Case of Resistance  |  Add Note

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

CONTRIBUTING WEED SCIENTISTS BERNAL VALVERDE Honorary Associate Professor The University of Copenhagen Department of Plant and Environmental Sciences Hojebakkegaard Allé 13 Taastrup, DK-2630, Hovedstaden Denmark Email Bernal Valverde

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

Herbicide Resistant Arrocillo Globally (Paspalum paniculatum) Herbicide Resistant Arrocillo Globally (Paspalum paniculatum) Drag a column header and drop it here to group by that column Herbicide Resistant Arrocillo Globally (Paspalum paniculatum) # Country Country StateName FirstYear Situation Active Ingredients CountryID Site of Action WeedID Species CommonName ResistID 1 Costa Rica Costa Rica   2010 Banana and Plantain, and Pejibaye palm glyphosate 11 Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ( HRAC Group 9 (Legacy G) 335 Paspalum paniculatum Arrocillo 17101

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