International Survey of Herbicide-Resistant Weeds

Countries Weeds Herbicides Mutations Graphs References Researchers
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Herbicide Resistant Weeds in Oregon, United States.
#YearSpeciesSite of ActionActivesContacts
1 320Italian Ryegrass1987Lolium perenne ssp. multiflorum
Italian Ryegrass
United States
(Oregon)
OregonOR Inhibition of Acetyl CoA Carboxylase (A/1) Inhibition of Acetyl CoA Carboxylase (A/1) diclofop-methyl Ian Heap
2 475Wild Oat1990Avena fatua
Wild Oat
United States
(Oregon)
OregonOR Inhibition of Microtubule Assembly 2 (K1/3) Inhibition of Microtubule Assembly 2 (K1/3) propyzamide/pronamide Steven Seefeldt
3 319Wild Oat1990Avena fatua
Wild Oat
United States
(Oregon)
Oregon  Inhibition of Acetyl CoA Carboxylase (A/1) Inhibition of Acetyl CoA Carboxylase (A/1) diclofop-methyl, fenoxaprop-ethyl Ian Heap
4 1173Russian-thistle1993Salsola tragus
Russian-thistle
United States
(Oregon)
OregonOR Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) chlorsulfuron, metsulfuron-methyl, triasulfuron Daniel Ball
5 1174Prickly Lettuce1993Lactuca serriola
Prickly Lettuce
United States
(Oregon)
OregonOR Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) chlorsulfuron, metsulfuron-methyl, triasulfuron Daniel Ball
6 1175Kochia1993Kochia scoparia
Kochia
United States
(Oregon)
OregonOR Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) chlorsulfuron, metsulfuron-methyl, triasulfuron Daniel Ball
7 321Redroot Pigweed1994Amaranthus retroflexus
Redroot Pigweed
United States
(Oregon)
OregonOR PSII inhibitors - Serine 264 Binders (C1 C2/5) PSII inhibitors - Serine 264 Binders (C1 C2/5) terbacil Ian Heap
8 334Annual Bluegrass1994Poa annua
Annual Bluegrass
United States
(Oregon)
OregonOR Very Long-Chain Fatty Acid Synthesis inhibitors (K3 N/16) Very Long-Chain Fatty Acid Synthesis inhibitors (K3 N/16) ethofumesate Ian Heap
9 336Annual Bluegrass1994Poa annua
Annual Bluegrass
United States
(Oregon)
OregonOR PSII inhibitors - Serine 264 Binders (C1 C2/7) PSII inhibitors - Serine 264 Binders (C1 C2/7) diuron Ian Heap
10 338Annual Bluegrass1994Poa annua
Annual Bluegrass
United States
(Oregon)
OregonOR PSII inhibitors - Serine 264 Binders (C1 C2/5) PSII inhibitors - Serine 264 Binders (C1 C2/5) atrazine Ian Heap
11 322Common Groundsel1995Senecio vulgaris
Common Groundsel
United States
(Oregon)
OregonOR PSII inhibitors - Histidine 215 Binders (C3/6) PSII inhibitors - Histidine 215 Binders (C3/6) bromoxynil Ian Heap
12 1112Downy Brome (Cheatgrass)1997Bromus tectorum
Downy Brome (Cheatgrass)
United States
(Oregon)
OregonOR Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) imazamox, primisulfuron-methyl, sulfosulfuron Daniel Ball, George Mueuller-Warrant, Kee-Woong Park
13 5111Smallseed Flaxfalse1999Camelina microcarpa
Smallseed Flaxfalse
United States
(Oregon)
Oregon  Inhibition of Acetolactate Synthase (B/2) Inhibition of Acetolactate Synthase (B/2) chlorsulfuron, metsulfuron-methyl Brad Hanson
14 18181Annual Bluegrass2000Poa annua
Annual Bluegrass
United States
(Oregon)
Oregon  PSII inhibitors - Serine 264 Binders (C1 C2/5), PSII inhibitors - Serine 264 Binders (C1 C2/7) Multiple Resistance: 2 Sites of Action
PSII inhibitors - Serine 264 Binders (C1 C2/5)
PSII inhibitors - Serine 264 Binders (C1 C2/7)
diuron, metribuzin George Mueuller-Warrant, Lemma Mengistu
15 5249Italian Ryegrass2004Lolium perenne ssp. multiflorum
Italian Ryegrass
United States
(Oregon)
Oregon  Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) glyphosate Jed Colquhoun
16 5375Downy Brome (Cheatgrass)2005Bromus tectorum
Downy Brome (Cheatgrass)
United States
(Oregon)
Oregon  Inhibition of Acetyl CoA Carboxylase (A/1) Inhibition of Acetyl CoA Carboxylase (A/1) clethodim, fluazifop-butyl, quizalofop-ethyl, sethoxydim Daniel Ball
17 5366Shepherd's-purse2007Capsella bursa-pastoris
Shepherd's-purse
United States
(Oregon)
OregonOR PSII inhibitors - Serine 264 Binders (C1 C2/5) PSII inhibitors - Serine 264 Binders (C1 C2/5) hexazinone, metribuzin Alejandro Perez-Jones, Carol Mallory-Smith
18 5564Italian Ryegrass2010Lolium perenne ssp. multiflorum
Italian Ryegrass
United States
(Oregon)
Oregon  Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9), Inhibition of Glutamine Synthetase (H/10) Multiple Resistance: 2 Sites of Action
Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9)
Inhibition of Glutamine Synthetase (H/10)
glufosinate-ammonium, glyphosate Carol Mallory-Smith, Wilson Avila Garcia
19 9944Kochia2014Kochia scoparia
Kochia
United States
(Oregon)
Oregon  Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) glyphosate Don Morishita, Prashant Jha, Joel Felix
20 13055Russian-thistle2016Salsola tragus
Russian-thistle
United States
(Oregon)
Oregon  Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) Inhibition of Enolpyruvyl Shikimate Phosphate Synthase (G/9) glyphosate Carol Mallory-Smith
21 17151Italian Ryegrass2018Lolium perenne ssp. multiflorum
Italian Ryegrass
United States
(Oregon)
Oregon  Very Long-Chain Fatty Acid Synthesis inhibitors (K3 N/15) Very Long-Chain Fatty Acid Synthesis inhibitors (K3 N/15) flufenacet Alberto Collavo, Roland Beffa
Contributing Weed Scientists
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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Thursday, October 21, 2021 .  Available  www.weedscience.org
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