INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE
select
Weeds Resistant to PS I Electron Diversion HRAC Group 22 (Legacy D)
by species and country
Weeds Resistant to PS I Electron Diversion HRAC Group 22 (Legacy D)
by species and country
Drag a column header and drop it here to group by that column
Weeds Resistant to PS I Electron Diversion HRAC Group 22 (Legacy D)
by species and country
#SpeciesCountryFirst Year
1 Alopecurus japonicus
Japanese Foxtail 		2010 - China
20105Alopecurus japonicusJapanese FoxtailD722PS I Electron Diversion
2 Amaranthus blitum (ssp. oleraceus)
Livid Amaranth 		1990 - Malaysia
199013Amaranthus blitum (ssp. oleraceus)Livid AmaranthD722PS I Electron Diversion
3 Arctotheca calendula
Capeweed 		1986 - Australia (Victoria)
198621Arctotheca calendulaCapeweedD722PS I Electron Diversion
4 Bidens pilosa
Hairy Beggarticks 		1991 - Kenya
199132Bidens pilosaHairy BeggarticksD722PS I Electron Diversion
5 Convolvulus arvensis
Field Bindweed 		2011 - Jordan
2011312Convolvulus arvensisField BindweedD722PS I Electron Diversion
6 Conyza bonariensis
Hairy Fleabane 		1989 - Egypt
1989 - Japan
2003 - South Africa
2009 - United States (California) *Multiple - 2 SOA's
2016 - Australia (New South Wales )
2022 - Jordan *Multiple - 2 SOA's
 		198960Conyza bonariensisHairy FleabaneD722PS I Electron Diversion
7 Conyza canadensis
Horseweed 		1980 - Japan
1993 - Canada (Ontario)
1994 - United States (Mississippi)
1998 - Belgium
2003 - United States (Delaware)
2007 - United States (Mississippi) *Multiple - 2 SOA's
2014 - United States (California) *Multiple - 2 SOA's
2024 - United States (New York)
198061Conyza canadensisHorseweedD722PS I Electron Diversion
8 Conyza sumatrensis
Sumatran Fleabane 		1980 - Taiwan
1986 - Japan
1990 - Malaysia
1998 - Sri Lanka
2016 - Brazil
2017 - Brazil *Multiple - 3 SOA's
2017 - Brazil *Multiple - 5 SOA's
2017 - Paraguay *Multiple - 3 SOA's
2018 - Australia (Queensland)
2024 - Bolivia
198065Conyza sumatrensisSumatran FleabaneD722PS I Electron Diversion
9 Crassocephalum crepidioides
Redflower Ragleaf 		1990 - Malaysia
199066Crassocephalum crepidioidesRedflower RagleafD722PS I Electron Diversion
10 Cuphea carthagenensis
Tarweed Cuphea 		1984 - Fiji
198468Cuphea carthagenensisTarweed CupheaD722PS I Electron Diversion
11 Eleusine indica
Goosegrass 		1990 - Malaysia
1996 - United States (Florida)
2009 - Malaysia *Multiple - 2 SOA's
2009 - Malaysia *Multiple - 4 SOA's
2010 - China
2012 - Indonesia *Multiple - 2 SOA's
2012 - Indonesia
2015 - Australia (Queensland)
2016 - Colombia *Multiple - 2 SOA's
2019 - United States (Alabama)
199081Eleusine indicaGoosegrassD722PS I Electron Diversion
12 Epilobium ciliatum
Fringed Willowherb 		1982 - Belgium
1989 - United Kingdom
198282Epilobium ciliatumFringed WillowherbD722PS I Electron Diversion
13 Erigeron philadelphicus
Philadelphia Fleabane 		1980 - Japan
198085Erigeron philadelphicusPhiladelphia FleabaneD722PS I Electron Diversion
14 Gamochaeta pensylvanica
Pennsylvania Everlasting 		1991 - Japan
2015 - Australia (Queensland)
1991298Gamochaeta pensylvanicaPennsylvania EverlastingD722PS I Electron Diversion
15 Hedyotis verticillata
Woody borreria 		2005 - Malaysia *Multiple - 2 SOA's
 		2005310Hedyotis verticillataWoody borreriaD722PS I Electron Diversion
16 Hordeum murinum ssp. glaucum
Smooth Barley 		1984 - Australia (Victoria)
1990 - Australia (South Australia)
198497Hordeum murinum ssp. glaucumSmooth BarleyD722PS I Electron Diversion
17 Hordeum murinum ssp. leporinum
Hare Barley 		1988 - Australia (Victoria)
2001 - Australia (South Australia)
198898Hordeum murinum ssp. leporinumHare BarleyD722PS I Electron Diversion
18 Ischaemum rugosum
Saramollagrass 		1989 - Malaysia
198999Ischaemum rugosumSaramollagrassD722PS I Electron Diversion
19 Landoltia punctata
Dotted Duckweed 		2001 - United States (Florida)
2001232Landoltia punctataDotted DuckweedD722PS I Electron Diversion
20 Lepidium virginicum
Virginia Pepperweed 		1993 - Canada (Ontario)
1993103Lepidium virginicumVirginia PepperweedD722PS I Electron Diversion
21 Lolium perenne ssp. multiflorum
Italian Ryegrass 		2015 - United States (California) *Multiple - 3 SOA's
2016 - United States (California) *Multiple - 4 SOA's
2022 - United States (North Carolina) *Multiple - 4 SOA's
 		2015110Lolium perenne ssp. multiflorumItalian RyegrassD722PS I Electron Diversion
22 Lolium rigidum
Rigid Ryegrass 		2002 - South Africa
2003 - South Africa *Multiple - 3 SOA's
2010 - Australia (South Australia) *Multiple - 2 SOA's
2010 - Australia (South Australia) *Multiple - 5 SOA's
2013 - Australia (Western Australia) *Multiple - 2 SOA's
 		2002112Lolium rigidumRigid RyegrassD722PS I Electron Diversion
23 Mazus fauriei
Asian Mazus 		2011 - China
2011281Mazus faurieiAsian Mazus D722PS I Electron Diversion
24 Mazus pumilus
Japanese Mazus 		2006 - Japan
2006296Mazus pumilusJapanese MazusD722PS I Electron Diversion
25 Mitracarpus hirtus
Tropical Girdlepod 		2007 - Australia (Queensland)
2007240Mitracarpus hirtus Tropical GirdlepodD722PS I Electron Diversion
26 Plantago lanceolata
Buckhorn Plantain 		2022 - South Africa *Multiple - 2 SOA's
 		2022220Plantago lanceolataBuckhorn PlantainD722PS I Electron Diversion
27 Poa annua
Annual Bluegrass 		1981 - United Kingdom
1993 - Belgium
2025 - United States (Oregon)
1981130Poa annuaAnnual BluegrassD722PS I Electron Diversion
28 Sclerochloa dura
Hardgrass 		2011 - China
2011283Sclerochloa duraHardgrassD722PS I Electron Diversion
29 Solanum americanum
American Black Nightshade 		1985 - United States (Florida)
2009 - New Zealand
1985161Solanum americanumAmerican Black NightshadeD722PS I Electron Diversion
30 Solanum nigrum
Black Nightshade 		1990 - Malaysia
2009 - New Zealand
2015 - Australia (Queensland)
1990162Solanum nigrumBlack NightshadeD722PS I Electron Diversion
31 Solanum ptycanthum
Eastern Black Nightshade 		2009 - Canada (Ontario)
2009190Solanum ptycanthumEastern Black NightshadeD722PS I Electron Diversion
32 Vulpia bromoides
Squirreltail Fescue 		1990 - Australia (Victoria)
1990173Vulpia bromoidesSquirreltail FescueD722PS I Electron Diversion
33 Youngia japonica
Asiatic Hawksbeard 		1986 - Japan
2009 - China
1986175Youngia japonicaAsiatic HawksbeardD722PS I Electron Diversion
HRAC Global Heap, I.  The International Herbicide-Resistant Weed Database.  Online.  Wednesday, September 23, 2026.  Available at  www.weedscience.org

Copyright © 1993- 2026 WeedScience.org. All rights reserved.

Normal scientific reference, citation, and limited use of individual records are permitted. Automated or systematic data extraction, bulk copying, database replication or synchronization, AI or machine-learning use, predictive-model development, redistribution, and commercial reuse are not permitted without prior written permission from WeedScience.org.

See our Data Use and AI Policy.