INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

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

UnknownHRAC Group 0 (Legacy Z)

New Zealand
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.

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QUIK STATS (last updated Sep 15, 2000 )

Common NameChilean or Uruguayan Needlegrass
SpeciesNassella neesiana
GroupUnknown HRAC Group 0 (Legacy Z)
Herbicidesdalapon
LocationNew Zealand
Year1992
Situation(s)Pastures
Contributors - (Alphabetically)Kerry Harrington 
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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.
 
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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)
#CountryFirstYearSituationActive IngredientsSite of Action
1 New ZealandNew Zealand 1992 Pastures dalapon 30 Unknown ( HRAC Group 0 (Legacy Z)
 		169Nassella neesianaChilean or Uruguayan Needlegrass514
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Heap, I.  The International Herbicide-Resistant Weed Database.  Online.  Thursday, November 14, 2024 .  Available  www.weedscience.org Copyright © 1993- 2024 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.