HRAC GROUP 2 (LEGACY B) RESISTANT GUYANESE ARROWHEAD
(Sagittaria guayanensis)

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Malaysia

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INTRODUCTION GUYANESE ARROWHEAD Guyanese Arrowhead (Sagittaria guayanensis) is a monocot weed in the Alismataceae family.  In Malaysia this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2000 and infests Rice.   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 bensulfuron-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 Jan 16, 2003 ) Common Name Guyanese Arrowhead Species Sagittaria guayanensis Group Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B) Herbicides bensulfuron-methyl Location Malaysia Year 2000 Situation(s) Rice Contributors - (Alphabetically) Kazuyuki Itoh  Edit this Case  |  Add New Case of Resistance  |  Add Note

ACADEMIC ASPECTS Confirmation Tests Greenhouse, and Laboratory trials comparing a known susceptible Guyanese Arrowhead biotype with this Guyanese Arrowhead 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 Guyanese Arrowhead 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 Guyanese Arrowhead from Malaysia please update the database.   Edit Case  |  Add Note  |  Add Article  |  Add New Case  |  Help

CONTRIBUTING WEED SCIENTISTS KAZUYUKI ITOH Professor Kobe University Graduate School of Agricultural Science １-１ Rokkodaicho Kobe, 657-0013, Hyogo Japan Email Kazuyuki Itoh

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

Herbicide Resistant Guyanese Arrowhead Globally (Sagittaria guayanensis) Herbicide Resistant Guyanese Arrowhead Globally (Sagittaria guayanensis) Drag a column header and drop it here to group by that column Herbicide Resistant Guyanese Arrowhead Globally (Sagittaria guayanensis) # Country Country StateName FirstYear Situation Active Ingredients CountryID Site of Action WeedID Species CommonName ResistID 1 Malaysia Malaysia   2000 Rice bensulfuron-methyl 28 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B) 215 Sagittaria guayanensis Guyanese Arrowhead 5145

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