select Select by Site of Action - (Inhibition of dihydroorotate dehydrogenase (DHODH) ) A (Inhibition of Acetyl CoA Carboxylase ) B (Inhibition of Acetolactate Synthase ) C1 (PSII inhibitors - Serine 264 Binders ) C1 C2 (PSII inhibitors - Serine 264 Binders ) C3 (PSII inhibitors - Histidine 215 Binders ) D (PS I Electron Diversion ) E (Inhibition of Protoporphyrinogen Oxidase ) F1 (Phytoene Desaturase inhibitors) F2 (Inhibition of Hydroxyphenyl Pyruvate Dioxygenase ) F3 (Inhibition of Lycopene Cyclase ) F4 (Inhibition of Deoxy-D-Xylulose Phosphate Synthase) G (Inhibition of Enolpyruvyl Shikimate Phosphate Synthase ) H (Inhibition of Glutamine Synthetase ) I (Inhibition of Dihydropteroate Synthase) K1 (Inhibition of Microtubule Assembly) K2 (Inhibition of Microtubule Organization ) K3 N (Very Long-Chain Fatty Acid Synthesis inhibitors) L (Inhibition of Cellulose Synthesis ) M (Uncouplers) N (Inhibition of Very Long-Chain Fatty Acid Synthesis ) O (Auxin Mimics ) P (Auxin Transport inhibitor) Q (Inhibition of Fatty Acid Thioesterase ) R (Inhibition of Serine-Threonine Protein Phosphatase ) S (Inhibition of Solanesyl Diphosphate Synthase ) T (Inhibition of Homogentisate Solanesyltransferase ) Z (Antimicrotubule mitotic disrupter) Z (Cell elongation inhibitors) Z (Nucleic acid inhibitors) Z (Unknown)

Weeds Resistant to Very Long-Chain Fatty Acid Synthesis inhibitors (K3 N/16) by species and country
Weeds Resistant to Very Long-Chain Fatty Acid Synthesis inhibitors (K3 N/16) by species and country Drag a column header and drop it here to group by that column

Weeds Resistant to Very Long-Chain Fatty Acid Synthesis inhibitors (K3 N/16) by species and country

#	Species	Country	First Year	WeedID	Species	CommonName	HRAC	MOAID	WSSA	HerbicideGroup
1	Alopecurus myosuroides Blackgrass	2007 - Germany *Multiple - 4 SOA's 2011 - Sweden *Multiple - 3 SOA's 2020 - France	2007	6	Alopecurus myosuroides	Blackgrass	K3 N	18	15	Very Long-Chain Fatty Acid Synthesis inhibitors
2	Amaranthus palmeri Palmer Amaranth	2016 - United States (Arkansas) *Multiple - 5 SOA's 2017 - United States (Arkansas)	2016	14	Amaranthus palmeri	Palmer Amaranth	K3 N	18	15	Very Long-Chain Fatty Acid Synthesis inhibitors
3	Amaranthus tuberculatus (=A. rudis) Tall Waterhemp	2016 - United States (Illinois)	2016	219	Amaranthus tuberculatus (=A. rudis)	Tall Waterhemp	K3 N	18	15	Very Long-Chain Fatty Acid Synthesis inhibitors
4	Avena fatua Wild Oat	1989 - Canada (Alberta) *Multiple - 2 SOA's 1990 - United States (Montana) *Multiple - 2 SOA's 1993 - United States (Idaho) *Multiple - 2 SOA's 1996 - Canada (Saskatchewan) 1996 - Canada (Saskatchewan) *Multiple - 3 SOA's 1997 - Canada (Manitoba) 1997 - Canada (Manitoba) *Multiple - 4 SOA's 1998 - Canada (Alberta) *Multiple - 3 SOA's 2015 - Canada (Manitoba) *Multiple - 4 SOA's	1989	28	Avena fatua	Wild Oat	K3 N	18	15	Very Long-Chain Fatty Acid Synthesis inhibitors
5	Echinochloa crus-galli var. crus-galli Barnyardgrass	1993 - China 1993 - China 1998 - Thailand *Multiple - 2 SOA's 2000 - United States (California) *Multiple - 2 SOA's 2005 - Philippines *Multiple - 2 SOA's	1993	79	Echinochloa crus-galli var. crus-galli	Barnyardgrass	K3 N	18	15	Very Long-Chain Fatty Acid Synthesis inhibitors
6	Echinochloa oryzoides Early Watergrass	2000 - United States (California)	2000	261	Echinochloa oryzoides	Early Watergrass	K3 N	18	15	Very Long-Chain Fatty Acid Synthesis inhibitors
7	Echinochloa phyllopogon (=E. oryzicola) Late Watergrass	1998 - United States (California) 2000 - United States (California) *Multiple - 2 SOA's	1998	178	Echinochloa phyllopogon (=E. oryzicola)	Late Watergrass	K3 N	18	15	Very Long-Chain Fatty Acid Synthesis inhibitors
8	Lolium perenne ssp. multiflorum Italian Ryegrass	2005 - United States (Idaho) *Multiple - 3 SOA's 2018 - France 2018 - United Kingdom 2018 - United States (Oregon) 2018 - United States (Washington)	2005	110	Lolium perenne ssp. multiflorum	Italian Ryegrass	K3 N	18	15	Very Long-Chain Fatty Acid Synthesis inhibitors
9	Lolium rigidum Rigid Ryegrass	1982 - Australia (South Australia) *Multiple - 6 SOA's 1984 - Australia (South Australia) 2015 - Australia (New South Wales ) 2015 - Australia (Victoria)	1982	112	Lolium rigidum	Rigid Ryegrass	K3 N	18	15	Very Long-Chain Fatty Acid Synthesis inhibitors
10	Poa annua Annual Bluegrass	1994 - United States (Oregon)	1994	130	Poa annua	Annual Bluegrass	K3 N	18	16	Very Long-Chain Fatty Acid Synthesis inhibitors

PERMISSION MUST BE OBTAINED FIRST if you intend to base a significant portion of a scientific paper on data derived from this site.
Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Sunday, November 2, 2025 .  Available  www.weedscience.org
Copyright © 1993- 2025 WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.