(Lolium persicum)

ACCase inhibitors (A/1)

Canada, Alberta
Persian Darnel (Lolium persicum) is a monocot weed in the Poaceae family.  In Alberta this weed first evolved resistance to Group A/1 herbicides in 2009 and infests Spring Barley, and Wheat.   Group A/1 herbicides are known as ACCase inhibitors (Inhibition of Acetyl CoA Carboxylase ).  Research has shown that these particular biotypes are resistant to fenoxaprop-P-ethyl, pinoxaden, and tralkoxydim and they may be cross-resistant to other Group A/1 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 Jan 19, 2014 )

Common NamePersian Darnel
SpeciesLolium persicum
GroupACCase inhibitors (A/1)
Herbicidesfenoxaprop-P-ethyl, pinoxaden, and tralkoxydim
LocationCanada, Alberta
Situation(s)Spring Barley, and Wheat
Contributors - (Alphabetically)Hugh Beckie 
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Confirmation Tests

Greenhouse, and Laboratory trials comparing a known susceptible Persian Darnel biotype with this Persian Darnel biotype have been used to confirm resistance. For further information on the tests conducted please contact the local weed scientists that provided this information.

Genetic studies on Group A/1 resistant Persian Darnel 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 A/1 resistant Persian Darnel from Alberta please update the database.
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Research Scientist
Agriculture & Agri-Food Canada, Science & Technology Branch
Herbicide-Resistant & Novel-Trait Plants
107 Science Place
Saskatoon, S7N 0X2, Saskatchewan
Email Hugh Beckie


The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Alberta have been instrumental in providing you this information. Particular thanks is given to Hugh Beckie for providing detailed information.
Herbicide Resistant Persian Darnel Globally
(Lolium persicum)
Herbicide Resistant Persian Darnel Globally
(Lolium persicum)
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Herbicide Resistant Persian Darnel Globally
(Lolium persicum)
#CountryFirstYearSituationActive IngredientsSite of Action
1 Canada (Saskatchewan) CanadaSaskatchewan2004 Spring Barley tralkoxydim 7 ACCase inhibitors (A/1)
181Lolium persicumPersian Darnel5244
2 Canada (Alberta) CanadaAlberta2009 Spring Barley, and Wheat fenoxaprop-P-ethyl, pinoxaden, and tralkoxydim 7 ACCase inhibitors (A/1)
181Lolium persicumPersian Darnel7832
3 United States (Montana) United StatesMontana1993 Wheat diclofop-methyl 45 ACCase inhibitors (A/1)
181Lolium persicumPersian Darnel557
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.  Sunday, April 18, 2021 .  Available Copyright © 1993- 2021 All rights reserved. Fair use of this material is encouraged. Proper citation is requested.