International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
(Lolium persicum)

ACCase inhibitors (A/1)

United States, Montana
Persian Darnel (Lolium persicum) is a monocot weed in the Poaceae family.  In Montana this weed first evolved resistance to Group A/1 herbicides in 1993 and infests Wheat.   Group A/1 herbicides are known as ACCase inhibitors (Inhibition of acetyl CoA carboxylase (ACCase)).  Research has shown that these particular biotypes are resistant to diclofop-methyl 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.

If we do not have a picture for this weed, or you can provide a better picture (scan, digital camera etc) please please e-mail it to us.

QUIK STATS (last updated Sep 15, 2000 )

Common NamePersian Darnel
SpeciesLolium persicum
GroupACCase inhibitors (A/1)
LocationUnited States, Montana
Contributors - (Alphabetically)Alvin Bussan 
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Alvin Bussan
Not resistant to sethoxydim. Only resistant to the cereal selective ACCase inhibitors. Need to rotate out of cereals and use sethoxydim and quizalofop but resistance to these herbicides may soon follow.

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Confirmation Tests

Greenhouse 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 Montana please update the database.
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Montana State University
747 Ridgemark Drive
Bozeman, 59717-3120, Montana
United States
Email Alvin Bussan


The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Montana have been instrumental in providing you this information. Particular thanks is given to Alvin Bussan for providing detailed information.
Herbicide Resistant Persian Darnel Globally
(Lolium persicum)
Herbicide Resistant Persian Darnel Globally
(Lolium persicum)
Drag a column header and drop it here to group by that column
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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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Wednesday, January 20, 2021 .  Available
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