HRAC GROUP 2 (LEGACY B) RESISTANT SHORTLEAF SPIKESEDGE
(Cyperus brevifolius)

Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B)

Japan, Kagawa, Saga, Shizuoka, Yamanashi

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INTRODUCTION SHORTLEAF SPIKESEDGE Shortleaf Spikesedge (Cyperus brevifolius) is a monocot weed in the Cyperaceae family.  In Japan this weed first evolved resistance to Group 2 (Legacy B) herbicides in 2010 and infests Golf courses.   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 flazasulfuron 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 Shortleaf Spikesedge Species Cyperus brevifolius Group Inhibition of Acetolactate Synthase HRAC Group 2 (Legacy B) Herbicides bensulfuron-methyl, and flazasulfuron Location Japan, Kagawa, Saga, Shizuoka, Yamanashi Year 2010 Situation(s) Golf courses Contributors - (Alphabetically) Satoshi Iwakami, and Akira Uchino  Edit this Case  |  Add New Case of Resistance  |  Add Note

NOTES ABOUT THIS BIOTYPE GENERAL Akira Uchino Okuno,J., S.Iwakami, A.Uchino, K.Tsuchida and M.Yokoyama (2015) Response to halosulfuron-methyl and Flazasulfuron and mutation of acetolactate synthase gene of Cyperus brevifolius survived in turf grass on golf course. Journal of Japan Society of Turfgrass Science 43, 159-162 (in Japanese with English summary). Edit this Note  |  Add New Note

ACADEMIC ASPECTS Confirmation Tests Greenhouse, and Laboratory trials comparing a known susceptible Shortleaf Spikesedge biotype with this Shortleaf Spikesedge 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 Shortleaf Spikesedge 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 Shortleaf Spikesedge 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 Shortleaf Spikesedge Globally (Cyperus brevifolius) Herbicide Resistant Shortleaf Spikesedge Globally (Cyperus brevifolius) Drag a column header and drop it here to group by that column Herbicide Resistant Shortleaf Spikesedge Globally (Cyperus brevifolius) # Country Country StateName FirstYear Situation Active Ingredients CountryID Site of Action WeedID Species CommonName ResistID 1 Japan Japan   2010 Golf courses bensulfuron-methyl, and flazasulfuron 25 Inhibition of Acetolactate Synthase ( HRAC Group 2 (Legacy B) 303 Cyperus brevifolius Shortleaf Spikesedge 7798

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