Herbicide Resistant Weeds

HERBICIDE RESISTANT WEEDS SUMMARY TABLE Friday, February 03, 2012
Herbicide Group Click for details	Site of Action	HRAC Group	Example Herbicide	Total
ALS inhibitors	Inhibition of acetolactate synthase ALS (acetohydroxyacid synthase AHAS)	B	Chlorsulfuron	116
Photosystem II inhibitors	Inhibition of photosynthesis at photosystem II	C1	Atrazine	69
ACCase inhibitors	Inhibition of acetyl CoA carboxylase (ACCase)	A	Diclofop-methyl	41
Synthetic Auxins	Synthetic auxins (action like indoleacetic acid)	O	2,4-D	29
Bipyridiliums	Photosystem-I-electron diversion	D	Paraquat	25
Ureas and amides	Inhibition of photosynthesis at photosystem II	C2	Chlorotoluron	22
Glycines	Inhibition of EPSP synthase	G	Glyphosate	21
Dinitroanilines and others	Microtubule assembly inhibition	K1	Trifluralin	11
Thiocarbamates and others	Inhibition of lipid synthesis - not ACCase inhibition	N	Triallate	8
Triazoles, ureas, isoxazolidiones	Bleaching: Inhibition of carotenoid biosynthesis (unknown target)	F3	Amitrole	5
Chloroacetamides and others	Inhibition of cell division (Inhibition of very long chain fatty acids)	K3	Butachlor	5
Nitriles and others	Inhibition of photosynthesis at photosystem II	C3	Bromoxynil	4
PPO inhibitors	Inhibition of protoporphyrinogen oxidase (PPO)	E	Oxyfluorfen	4
Carotenoid biosynthesis inhibitors	Bleaching: Inhibition of carotenoid biosynthesis at the phytoene desaturase step (PDS)	F1	Flurtamone	2
Glutamine synthase inhibitors	Inhibition of glutamine synthetase	H	Glufosinate-ammonium	2
Arylaminopropionic acids	Unknown	Z	Flamprop-methyl	2
				1
4-HPPD inhibitors	Bleaching: Inhibition of 4-hydroxyphenyl-pyruvate-dioxygenase (4-HPPD)	F2	Isoxaflutole	1
Mitosis inhibitors	Inhibition of mitosis / microtubule polymerization inhibitor	K2	Propham	1
Cellulose inhibitors	Inhibition of cell wall (cellulose) synthesis	L	Dichlobenil	1
Unknown	Unknown	Z	(chloro) - flurenol	1
Organoarsenicals	Unknown	Z	MSMA	1
Total Number of Unique Herbicide Resistant Biotypes				372