International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
MULTIPLE RESISTANT PERENNIAL RYEGRASS
(Lolium perenne)


Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)

Germany
INTRODUCTION PERENNIAL RYEGRASS
Perennial Ryegrass (Lolium perenne) is a monocot weed in the Poaceae family.  In Germany this weed first evolved multiple resistance (to 2 herbicide sites of action) in 2008 and infests Wheat.  Multiple resistance has evolved to herbicides in the Groups A/1, and B/2.  These particular biotypes are known to have resistance to iodosulfuron-methyl-sodium, pinoxaden, and pyroxsulam and they may be cross-resistant to other herbicides in the Groups A/1, and B/2.

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 Jun 23, 2009 )

Common NamePerennial Ryegrass
SpeciesLolium perenne
GroupACCase inhibitors (A/1)
ALS inhibitors (B/2)
Herbicidesiodosulfuron-methyl-sodium, pinoxaden, and pyroxsulam
LocationGermany
Year2008
Situation(s)Wheat
Contributors - (Alphabetically)Jan Petersen 
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ACADEMIC ASPECTS

Confirmation Tests

Greenhouse trials comparing a known susceptible Perennial Ryegrass biotype with this Perennial Ryegrass 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 A, B/1, 2 resistant Perennial Ryegrass 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 multiple resistant Perennial Ryegrass from Germany please update the database.
 
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CONTRIBUTING WEED SCIENTISTS

JAN PETERSEN
Professor
University Of Applied Science Bingen
Fac. Of Life Science And Engineering
2836 Crestscene Trail
Bingen, D-55411
Germany
Email Jan Petersen
Web   : Web Site Link

ACKNOWLEDGEMENTS

The Herbicide Resistance Action Committee, The Weed Science Society of America, and weed scientists in Germany have been instrumental in providing you this information. Particular thanks is given to Jan Petersen for providing detailed information.
Herbicide Resistant Perennial Ryegrass Globally
(Lolium perenne)
Herbicide Resistant Perennial Ryegrass Globally
(Lolium perenne)
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Herbicide Resistant Perennial Ryegrass Globally
(Lolium perenne)
#CountryFirstYearSituationActive IngredientsSite of Action
1 ArgentinaArgentina 2008 Soybean, Spring Barley, and Wheat glyphosate 48 EPSP synthase inhibitors (G/9)
111Lolium perennePerennial Ryegrass5487
2 ChileChile 2001 Cereals clodinafop-propargyl, and diclofop-methyl 8 ACCase inhibitors (A/1)
111Lolium perennePerennial Ryegrass5397
3 DenmarkDenmark 2016 Wheat clodinafop-propargyl, and iodosulfuron-methyl-sodium 13 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
111Lolium perennePerennial Ryegrass15077
4 GermanyGermany 2008 Wheat iodosulfuron-methyl-sodium, pinoxaden, and pyroxsulam 18 Multiple Resistance: 2 Sites of Action
ACCase inhibitors (A/1)
ALS inhibitors (B/2)
111Lolium perennePerennial Ryegrass5385
5 New ZealandNew Zealand 2012 Grapes glyphosate 30 EPSP synthase inhibitors (G/9)
111Lolium perennePerennial Ryegrass6750
6 New ZealandNew Zealand 2015 Grapes amitrole, glufosinate-ammonium, and glyphosate 30 Multiple Resistance: 3 Sites of Action
Carotenoid biosynthesis (unknown target) (F3/11)
EPSP synthase inhibitors (G/9)
Glutamine synthase inhibitors (H/10)
111Lolium perennePerennial Ryegrass14055
7 PortugalPortugal 2013 Grapes glyphosate 34 EPSP synthase inhibitors (G/9)
111Lolium perennePerennial Ryegrass7825
8 United States (California) United StatesCalifornia1989 Railways, and Roadsides sulfometuron-methyl 45 ALS inhibitors (B/2)
111Lolium perennePerennial Ryegrass396
9 United States (Texas) United StatesTexas1989 Roadsides sulfometuron-methyl 45 ALS inhibitors (B/2)
111Lolium perennePerennial Ryegrass397
Literature about Similar Cases

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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Thursday, September 21, 2017 .  Available  www.weedscience.org
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