1
| 320 | Italian Ryegrass | 1987 | Lolium perenne ssp. multiflorum Italian Ryegrass | United States (Oregon) | Oregon | OR | ACCase inhibitors (A/1) |
ACCase inhibitors (A/1)
| diclofop-methyl | Ian Heap |
2
| 475 | Wild Oat | 1990 | Avena fatua Wild Oat | United States (Oregon) | Oregon | OR | Microtubule inhibitors (K1/3) |
Microtubule inhibitors (K1/3)
| propyzamide = pronamide | Steven Seefeldt |
3
| 319 | Wild Oat | 1990 | Avena fatua Wild Oat | United States (Oregon) | Oregon | | ACCase inhibitors (A/1) |
ACCase inhibitors (A/1)
| diclofop-methyl, fenoxaprop-P-ethyl | Ian Heap |
4
| 1173 | Russian-thistle | 1993 | Salsola tragus Russian-thistle | United States (Oregon) | Oregon | OR | ALS inhibitors (B/2) |
ALS inhibitors (B/2)
| chlorsulfuron, metsulfuron-methyl, triasulfuron | Daniel Ball |
5
| 1174 | Prickly Lettuce | 1993 | Lactuca serriola Prickly Lettuce | United States (Oregon) | Oregon | OR | ALS inhibitors (B/2) |
ALS inhibitors (B/2)
| chlorsulfuron, metsulfuron-methyl, triasulfuron | Daniel Ball |
6
| 1175 | Kochia | 1993 | Kochia scoparia Kochia | United States (Oregon) | Oregon | OR | ALS inhibitors (B/2) |
ALS inhibitors (B/2)
| chlorsulfuron, metsulfuron-methyl, triasulfuron | Daniel Ball |
7
| 321 | Redroot Pigweed | 1994 | Amaranthus retroflexus Redroot Pigweed | United States (Oregon) | Oregon | OR | Photosystem II inhibitors (C1/5) |
Photosystem II inhibitors (C1/5)
| terbacil | Ian Heap |
8
| 334 | Annual Bluegrass | 1994 | Poa annua Annual Bluegrass | United States (Oregon) | Oregon | OR | Lipid Inhibitors (N/16) |
Lipid Inhibitors (N/16)
| ethofumesate | Ian Heap |
9
| 336 | Annual Bluegrass | 1994 | Poa annua Annual Bluegrass | United States (Oregon) | Oregon | OR | PSII inhibitor (Ureas and amides) (C2/7) |
PSII inhibitor (Ureas and amides) (C2/7)
| diuron | Ian Heap |
10
| 338 | Annual Bluegrass | 1994 | Poa annua Annual Bluegrass | United States (Oregon) | Oregon | OR | Photosystem II inhibitors (C1/5) |
Photosystem II inhibitors (C1/5)
| atrazine | Ian Heap |
11
| 322 | Common Groundsel | 1995 | Senecio vulgaris Common Groundsel | United States (Oregon) | Oregon | OR | PSII inhibitors (Nitriles) (C3/6) |
PSII inhibitors (Nitriles) (C3/6)
| bromoxynil | Ian Heap |
12
| 1112 | Downy Brome (Cheatgrass) | 1997 | Bromus tectorum Downy Brome (Cheatgrass) | United States (Oregon) | Oregon | OR | ALS inhibitors (B/2) |
ALS inhibitors (B/2)
| imazamox, primisulfuron-methyl, sulfosulfuron | Daniel Ball, George Mueuller-Warrant, Kee-Woong Park |
13
| 5111 | Smallseed Flaxfalse | 1999 | Camelina microcarpa Smallseed Flaxfalse | United States (Oregon) | Oregon | | ALS inhibitors (B/2) |
ALS inhibitors (B/2)
| chlorsulfuron, metsulfuron-methyl | Brad Hanson |
14
| 18181 | Annual Bluegrass | 2000 | Poa annua Annual Bluegrass | United States (Oregon) | Oregon | | Photosystem II inhibitors (C1/5), PSII inhibitor (Ureas and amides) (C2/7) |
Multiple Resistance: 2 Sites of Action Photosystem II inhibitors (C1/5) PSII inhibitor (Ureas and amides) (C2/7)
| diuron, metribuzin | George Mueuller-Warrant, Lemma Mengistu |
15
| 5249 | Italian Ryegrass | 2004 | Lolium perenne ssp. multiflorum Italian Ryegrass | United States (Oregon) | Oregon | | EPSP synthase inhibitors (G/9) |
EPSP synthase inhibitors (G/9)
| glyphosate | Jed Colquhoun |
16
| 5375 | Downy Brome (Cheatgrass) | 2005 | Bromus tectorum Downy Brome (Cheatgrass) | United States (Oregon) | Oregon | | ACCase inhibitors (A/1) |
ACCase inhibitors (A/1)
| clethodim, fluazifop-P-butyl, quizalofop-P-ethyl, sethoxydim | Daniel Ball |
17
| 5366 | Shepherd's-purse | 2007 | Capsella bursa-pastoris Shepherd's-purse | United States (Oregon) | Oregon | OR | Photosystem II inhibitors (C1/5) |
Photosystem II inhibitors (C1/5)
| hexazinone, metribuzin | Alejandro Perez-Jones, Carol Mallory-Smith |
18
| 5564 | Italian Ryegrass | 2010 | Lolium perenne ssp. multiflorum Italian Ryegrass | United States (Oregon) | Oregon | | EPSP synthase inhibitors (G/9), Glutamine synthase inhibitors (H/10) |
Multiple Resistance: 2 Sites of Action EPSP synthase inhibitors (G/9) Glutamine synthase inhibitors (H/10)
| glufosinate-ammonium, glyphosate | Carol Mallory-Smith, Wilson Avila Garcia |
19
| 9944 | Kochia | 2014 | Kochia scoparia Kochia | United States (Oregon) | Oregon | | EPSP synthase inhibitors (G/9) |
EPSP synthase inhibitors (G/9)
| glyphosate | Don Morishita, Prashant Jha, Joel Felix |
20
| 13055 | Russian-thistle | 2016 | Salsola tragus Russian-thistle | United States (Oregon) | Oregon | | EPSP synthase inhibitors (G/9) |
EPSP synthase inhibitors (G/9)
| glyphosate | Carol Mallory-Smith |
21
| 17151 | Italian Ryegrass | 2018 | Lolium perenne ssp. multiflorum Italian Ryegrass | United States (Oregon) | Oregon | | Long chain fatty acid inhibitors (K3/15) |
Long chain fatty acid inhibitors (K3/15)
| flufenacet | Alberto Collavo, Roland Beffa |