1
| 1037 | Common Groundsel | 1981 | Senecio vulgaris Common Groundsel | United States (California) | California | CA | Photosystem II inhibitors (C1/5) |
Photosystem II inhibitors (C1/5)
| atrazine | Jodie Holt |
2
| 396 | Perennial Ryegrass | 1989 | Lolium perenne Perennial Ryegrass | United States (California) | California | CA | ALS inhibitors (B/2) |
ALS inhibitors (B/2)
| sulfometuron-methyl | Leonard Saari, Josephine Cotterman |
3
| 390 | California Arrowhead | 1993 | Sagittaria montevidensis California Arrowhead | United States (California) | California | CA | ALS inhibitors (B/2) |
ALS inhibitors (B/2)
| bensulfuron-methyl | Michael Carriere |
4
| 391 | Smallflower Umbrella Sedge | 1993 | Cyperus difformis Smallflower Umbrella Sedge | United States (California) | California | CA | ALS inhibitors (B/2) |
ALS inhibitors (B/2)
| bensulfuron-methyl | Michael Carriere |
5
| 1036 | Russian-thistle | 1994 | Salsola tragus Russian-thistle | United States (California) | California | | ALS inhibitors (B/2) |
ALS inhibitors (B/2)
| chlorsulfuron, sulfometuron-methyl | Timothy Prather, Jodie Holt |
6
| 1176 | Wild Oat | 1996 | Avena fatua Wild Oat | United States (California) | California | CA | Cell elongation inhibitors (Z/8) |
Cell elongation inhibitors (Z/8)
| difenzoquat | Steve Orloff, Jodie Holt |
7
| 1098 | Eared Redstem | 1997 | Ammannia auriculata Eared Redstem | United States (California) | California | CA | ALS inhibitors (B/2) |
ALS inhibitors (B/2)
| bensulfuron-methyl | Jim Hill |
8
| 1099 | Ricefield Bulrush | 1997 | Schoenoplectus mucronatus (=Scirpus mucronatus) Ricefield Bulrush | United States (California) | California | CA | ALS inhibitors (B/2) |
ALS inhibitors (B/2)
| bensulfuron-methyl | Jim Hill |
9
| 283 | Late Watergrass | 1998 | Echinochloa phyllopogon (=E. oryzicola) Late Watergrass | United States (California) | California | CA | ACCase inhibitors (A/1) |
ACCase inhibitors (A/1)
| fenoxaprop-P-ethyl | Albert Fischer |
10
| 1034 | Rigid Ryegrass | 1998 | Lolium rigidum Rigid Ryegrass | United States (California) | California | | EPSP synthase inhibitors (G/9) |
EPSP synthase inhibitors (G/9)
| glyphosate | Thomas Lanini : retired, Brad Hanson, Marie Jasieniuk |
11
| 1035 | Late Watergrass | 1998 | Echinochloa phyllopogon (=E. oryzicola) Late Watergrass | United States (California) | California | CA | Lipid Inhibitors (N/8) |
Lipid Inhibitors (N/8)
| thiobencarb = benthiocarb | Albert Fischer |
12
| 5492 | Early Watergrass | 2000 | Echinochloa oryzoides Early Watergrass | United States (California) | California | | Lipid Inhibitors (N/8) |
Lipid Inhibitors (N/8)
| molinate, thiobencarb = benthiocarb | Albert Fischer |
13
| 5135 | Redstem | 2000 | Ammannia coccinea Redstem | United States (California) | California | | ALS inhibitors (B/2) |
ALS inhibitors (B/2)
| bensulfuron-methyl | Jim Hill |
14
| 5136 | Barnyardgrass | 2000 | Echinochloa crus-galli var. crus-galli Barnyardgrass | United States (California) | California | | ACCase inhibitors (A/1), Lipid Inhibitors (N/8) |
Multiple Resistance: 2 Sites of Action ACCase inhibitors (A/1) Lipid Inhibitors (N/8)
| cyhalofop-butyl, fenoxaprop-P-ethyl, molinate, thiobencarb = benthiocarb | Albert Fischer |
15
| 5137 | Late Watergrass | 2000 | Echinochloa phyllopogon (=E. oryzicola) Late Watergrass | United States (California) | California | | ACCase inhibitors (A/1), Lipid Inhibitors (N/8) |
Multiple Resistance: 2 Sites of Action ACCase inhibitors (A/1) Lipid Inhibitors (N/8)
| cyhalofop-butyl, fenoxaprop-P-ethyl, molinate, thiobencarb = benthiocarb | Albert Fischer |
16
| 5163 | Little seed Canary grass | 2001 | Phalaris minor Little seed Canary grass | United States (California) | California | | ACCase inhibitors (A/1) |
ACCase inhibitors (A/1)
| clethodim, fenoxaprop-P-ethyl, fluazifop-P-butyl, sethoxydim | Joseph Di Tomaso |
17
| 5134 | Smooth Crabgrass | 2002 | Digitaria ischaemum Smooth Crabgrass | United States (California) | California | | Synthetic Auxins (O/4) |
Synthetic Auxins (O/4)
| quinclorac | Albert Fischer |
18
| 5250 | Horseweed | 2005 | Conyza canadensis Horseweed | United States (California) | California | | EPSP synthase inhibitors (G/9) |
EPSP synthase inhibitors (G/9)
| glyphosate | Brad Hanson, Anil Shrestha, Kurt Hembree, Steve Wright |
19
| 5310 | Hairy Fleabane | 2007 | Conyza bonariensis Hairy Fleabane | United States (California) | California | | EPSP synthase inhibitors (G/9) |
EPSP synthase inhibitors (G/9)
| glyphosate | Brad Hanson, Anil Shrestha, Kurt Hembree, Marcelo L. Moretti |
20
| 5545 | Junglerice | 2008 | Echinochloa colona Junglerice | United States (California) | California | | EPSP synthase inhibitors (G/9) |
EPSP synthase inhibitors (G/9)
| glyphosate | Albert Fischer, Thomas Lanini : retired, Brad Hanson, Steve Wright |
21
| 5698 | Italian Ryegrass | 2008 | Lolium perenne ssp. multiflorum Italian Ryegrass | United States (California) | California | | EPSP synthase inhibitors (G/9) |
EPSP synthase inhibitors (G/9)
| glyphosate | Marie Jasieniuk |
22
| 5390 | Hairy Fleabane | 2009 | Conyza bonariensis Hairy Fleabane | United States (California) | California | | EPSP synthase inhibitors (G/9), PSI Electron Diverter (D/22) |
Multiple Resistance: 2 Sites of Action EPSP synthase inhibitors (G/9) PSI Electron Diverter (D/22)
| glyphosate, paraquat | Brad Hanson, Anil Shrestha, Kurt Hembree, Steve Wright, Marcelo L. Moretti |
23
| 6739 | Smallflower Umbrella Sedge | 2013 | Cyperus difformis Smallflower Umbrella Sedge | United States (California) | California | | PSII inhibitor (Ureas and amides) (C2/7) |
PSII inhibitor (Ureas and amides) (C2/7)
| propanil | Albert Fischer, Rafael Pedroso |
24
| 7805 | Annual Bluegrass | 2013 | Poa annua Annual Bluegrass | United States (California) | California | | EPSP synthase inhibitors (G/9) |
EPSP synthase inhibitors (G/9)
| glyphosate | Brad Hanson, Marcelo L. Moretti |
25
| 9924 | Ricefield Bulrush | 2014 | Schoenoplectus mucronatus (=Scirpus mucronatus) Ricefield Bulrush | United States (California) | California | | PSII inhibitor (Ureas and amides) (C2/7) |
PSII inhibitor (Ureas and amides) (C2/7)
| propanil | Albert Fischer, Rafael Pedroso |
26
| 9943 | Horseweed | 2014 | Conyza canadensis Horseweed | United States (California) | California | | EPSP synthase inhibitors (G/9), PSI Electron Diverter (D/22) |
Multiple Resistance: 2 Sites of Action EPSP synthase inhibitors (G/9) PSI Electron Diverter (D/22)
| glyphosate, paraquat | Brad Hanson, Marcelo L. Moretti |
27
| 13041 | Palmer Amaranth | 2015 | Amaranthus palmeri Palmer Amaranth | United States (California) | California | | EPSP synthase inhibitors (G/9) |
EPSP synthase inhibitors (G/9)
| glyphosate | Brad Hanson, Anil Shrestha, Steve Wright, Jorge Angeles, Samikshya Budhathoki , Mala To, Sonia Rios |
28
| 13044 | Italian Ryegrass | 2015 | Lolium perenne ssp. multiflorum Italian Ryegrass | United States (California) | California | | Glutamine synthase inhibitors (H/10) |
Glutamine synthase inhibitors (H/10)
| glufosinate-ammonium | Marie Jasieniuk, Parsa Tehranchian |
29
| 15066 | Italian Ryegrass | 2015 | Lolium perenne ssp. multiflorum Italian Ryegrass | United States (California) | California | | ACCase inhibitors (A/1), EPSP synthase inhibitors (G/9), PSI Electron Diverter (D/22) |
Multiple Resistance: 3 Sites of Action ACCase inhibitors (A/1) EPSP synthase inhibitors (G/9) PSI Electron Diverter (D/22)
| glyphosate, paraquat, sethoxydim | Brad Hanson, Marie Jasieniuk, Caio Brunharo, Parsa Tehranchian |
30
| 17104 | Italian Ryegrass | 2016 | Lolium perenne ssp. multiflorum Italian Ryegrass | United States (California) | California | | ACCase inhibitors (A/1), ALS inhibitors (B/2), EPSP synthase inhibitors (G/9), PSI Electron Diverter (D/22) |
Multiple Resistance: 4 Sites of Action ACCase inhibitors (A/1) ALS inhibitors (B/2) EPSP synthase inhibitors (G/9) PSI Electron Diverter (D/22)
| clethodim, cyhalofop-butyl, fenoxaprop-P-ethyl, fluazifop-P-butyl, glyphosate, imazamox, mesosulfuron-methyl, paraquat, sethoxydim | Marie Jasieniuk, Maor Matzrafi, Parsa Tehranchian |