International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
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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
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Tuesday, May 30, 2017 .  Available  www.weedscience.org
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