International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
GROUP N/26 RESISTANT CHILEAN OR URUGUAYAN NEEDLEGRASS
(Nassella neesiana)


Lipid Inhibitors (N/26)

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 N/26 herbicides in 1992 and infests Pastures.   Group N/26 herbicides are known as Lipid Inhibitors (Inhibition of lipid synthesis - not ACCase inhibition).  Research has shown that these particular biotypes are resistant to dalapon and they may be cross-resistant to other Group N/26 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
GroupLipid Inhibitors (N/26)
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 Group N/26 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 N/26 resistant Chilean or Uruguayan Needlegrass from New Zealand please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

KERRY HARRINGTON
Massey University
624 Betts Rd
Palmerston North
New Zealand
Email Kerry Harrington

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)
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Herbicide Resistant Chilean or Uruguayan Needlegrass Globally
(Nassella neesiana)
#CountryFirstYearSituationActive IngredientsSite of Action
1 New ZealandNew Zealand 1992 Pastures dalapon 30 Lipid Inhibitors (N/26)
169Nassella neesianaChilean or Uruguayan Needlegrass514
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Wednesday, October 16, 2019 .  Available  www.weedscience.org
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