HRAC GROUP 2 (LEGACY B) RESISTANT HERA-OMODAKA
(Alisma canaliculatum)

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Japan, Tochigi

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INTRODUCTION HERA-OMODAKA Hera-omodaka (Alisma canaliculatum) is a monocot weed in the Alismataceae family.  In Japan this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2007 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 pyrazosulfuron-ethyl 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 Hera-omodaka Species Alisma canaliculatum Group Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B) Herbicides bensulfuron-methyl, and pyrazosulfuron-ethyl Location Japan, Tochigi Year 2007 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 Hera-omodaka biotype with this Hera-omodaka 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 Hera-omodaka 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 Hera-omodaka 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 Hera-omodaka Globally (Alisma canaliculatum) Herbicide Resistant Hera-omodaka Globally (Alisma canaliculatum) Drag a column header and drop it here to group by that column Herbicide Resistant Hera-omodaka Globally (Alisma canaliculatum) # Country Country StateName FirstYear Situation Active Ingredients CountryID Site of Action WeedID Species CommonName ResistID 1 Japan Japan   2007 Rice bensulfuron-methyl, and pyrazosulfuron-ethyl 25 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B) 300 Alisma canaliculatum Hera-omodaka 7793

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