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 PSII inhibitors - Histidine 215 Binders (C3/6) by species and country
Weeds Resistant to PSII inhibitors - Histidine 215 Binders (C3/6) by species and country Drag a column header and drop it here to group by that column

Weeds Resistant to PSII inhibitors - Histidine 215 Binders (C3/6) by species and country

#	Species	Country	First Year	WeedID	Species	CommonName	HRAC	MOAID	WSSA	HerbicideGroup
1	Amaranthus hybridus (syn: quitensis) Smooth Pigweed	2004 - Canada (Ontario)	2004	12	Amaranthus hybridus (syn: quitensis)	Smooth Pigweed	C3	6	6	PSII inhibitors - Histidine 215 Binders
2	Amaranthus retroflexus Redroot Pigweed	2005 - Canada (Ontario)	2005	16	Amaranthus retroflexus	Redroot Pigweed	C3	6	6	PSII inhibitors - Histidine 215 Binders
3	Cyperus difformis Smallflower Umbrella Sedge	2023 - Portugal *Multiple - 2 SOA's	2023	71	Cyperus difformis	Smallflower Umbrella Sedge	C3	6	6	PSII inhibitors - Histidine 215 Binders
4	Sagittaria montevidensis California Arrowhead	2009 - Brazil *Multiple - 2 SOA's	2009	146	Sagittaria montevidensis	California Arrowhead	C3	6	6	PSII inhibitors - Histidine 215 Binders
5	Senecio vulgaris Common Groundsel	1995 - United States (Oregon)	1995	148	Senecio vulgaris	Common Groundsel	C3	6	6	PSII inhibitors - Histidine 215 Binders

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Cite this site as: Heap, I.  The International Survey of Herbicide Resistant Weeds.  Online.  Internet.  Friday, October 31, 2025 .  Available  www.weedscience.org
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