HRAC GROUP 0 (LEGACY Z) RESISTANT CHILEAN OR URUGUAYAN NEEDLEGRASS
(Nassella neesiana)

UnknownHRAC Group 0 (Legacy Z)

New Zealand

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INTRODUCTION CHILEAN OR URUGUAYAN NEEDLEGRASS Chilean or Uruguayan Needlegrass (Nassella neesiana) is a monocot weed in the Poaceae family.  In New Zealand this weed first evolved resistance to Group 0 (Legacy Z) herbicides in 1992 and infests Pastures.   Group 0 (Legacy Z) herbicides are known as Unknown (Unknown).  Research has shown that these particular biotypes are resistant to dalapon and they may be cross-resistant to other Group 0 (Legacy Z) 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 Sep 15, 2000 ) Common Name Chilean or Uruguayan Needlegrass Species Nassella neesiana Group Unknown HRAC Group 0 (Legacy Z) Herbicides dalapon Location New Zealand Year 1992 Situation(s) Pastures Contributors - (Alphabetically) Kerry Harrington  Edit this Case  |  Add New Case of Resistance  |  Add Note

ACADEMIC ASPECTS Confirmation Tests Field, and Greenhouse trials comparing a known susceptible Chilean or Uruguayan Needlegrass biotype with this Chilean or Uruguayan Needlegrass 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 0 resistant Chilean or Uruguayan Needlegrass 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 0 (Legacy Z) resistant Chilean or Uruguayan Needlegrass from New Zealand please update the database.   Edit Case  |  Add Note  |  Add Article  |  Add New Case  |  Help

CONTRIBUTING WEED SCIENTISTS KERRY HARRINGTON Associate Professor in Weed Science Massey University School of Agriculture Private Bag 11-222 Palmerston North, 4442, Manawatu New Zealand Email Kerry Harrington Web   : Web Site Link

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

Herbicide Resistant Chilean or Uruguayan Needlegrass Globally (Nassella neesiana) Herbicide Resistant Chilean or Uruguayan Needlegrass Globally (Nassella neesiana) Drag a column header and drop it here to group by that column Herbicide Resistant Chilean or Uruguayan Needlegrass Globally (Nassella neesiana) # Country Country StateName FirstYear Situation Active Ingredients CountryID Site of Action WeedID Species CommonName ResistID 1 New Zealand New Zealand   1992 Pastures dalapon 30 Unknown ( HRAC Group 0 (Legacy Z) 169 Nassella neesiana Chilean or Uruguayan Needlegrass 514

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