<b>HRAC Group 15</b> <font size='2'> (Legacy K3 N) </font> resistant Nassella neesiana from New Zealand

INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE

HRAC GROUP 15 (LEGACY K3 N) RESISTANT CHILEAN OR URUGUAYAN NEEDLEGRASS
(Nassella neesiana)

Very Long-Chain Fatty Acid Synthesis inhibitorsHRAC Group 15 (Legacy K3 N)

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 15 (Legacy K3 N) herbicides in 1992 and infests Pastures. Group 15 (Legacy K3 N) herbicides are known as Very Long-Chain Fatty Acid Synthesis inhibitors (Inhibition of Very Long-Chain Fatty Acid Synthesis ). Research has shown that these particular biotypes are resistant to dalapon and they may be cross-resistant to other Group 15 (Legacy K3 N) 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	Very Long-Chain Fatty Acid Synthesis inhibitors HRAC Group 15 (Legacy K3 N)
Herbicides	dalapon
Location	New Zealand
Year	1992
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 15 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 15 (Legacy K3 N) 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.

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Herbicide Resistant Chilean or Uruguayan Needlegrass Globally
(Nassella neesiana)

Country

FirstYear

Situation

Active Ingredients

Site of Action

New Zealand

1992

Pastures

dalapon

Very Long-Chain Fatty Acid Synthesis inhibitors ( HRAC Group 15 (Legacy K3 N)

Literature about Similar Cases

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PERMISSION MUST BE OBTAINED FIRST if you intend to base a significant portion of a scientific paper on data derived from this site. Citation:
Heap, I. The International Herbicide-Resistant Weed Database. Online. Friday, April 19, 2024 . Available www.weedscience.org Copyright © 1993- 2024 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.