HRAC GROUP 2 (LEGACY B) RESISTANT TAIWAN-YAMAI
(Schoenoplectus wallichii)

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Japan, Miyagi

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INTRODUCTION TAIWAN-YAMAI Taiwan-yamai (Schoenoplectus wallichii) is a monocot weed in the Cyperaceae family.  In Japan 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 08, 2014 ) Common Name Taiwan-yamai Species Schoenoplectus wallichii Group Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B) Herbicides bensulfuron-methyl Location Japan, Miyagi Year 2000 Situation(s) Rice Contributors - (Alphabetically) Satoshi Iwakami, and Akira Uchino  Edit this Case  |  Add New Case of Resistance  |  Add Note

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

CONTRIBUTING WEED SCIENTISTS SATOSHI IWAKAMI Weed Scientist University of Tsukuba Faculty of Life and Environmental Sciences 1-1-1 Tennoudai Tsukuba, 305-8577, Ibaraki Japan Email Satoshi Iwakami AKIRA UCHINO Weed Scientist NARO Agricultural Research Center Faculty of Life and Environmental Sciences 3-1-1 Kannondai Tsukuba, 305-8666, Ibaraki Japan Email Akira Uchino

ACKNOWLEDGEMENTS The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Japan have been instrumental in providing you this information. Particular thanks is given to Satoshi Iwakami, and Akira Uchino for providing detailed information.

Herbicide Resistant Taiwan-yamai Globally (Schoenoplectus wallichii) Herbicide Resistant Taiwan-yamai Globally (Schoenoplectus wallichii) Drag a column header and drop it here to group by that column Herbicide Resistant Taiwan-yamai Globally (Schoenoplectus wallichii) # Country Country StateName FirstYear Situation Active Ingredients CountryID Site of Action WeedID Species CommonName ResistID 1 Japan Japan   2000 Rice bensulfuron-methyl 25 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B) 299 Schoenoplectus wallichii Taiwan-yamai 7790

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