Table 2.1-9. Herbicide modes and sites of action and representative examples within each group.
Mode of action Site of action Herbicide examples
Growth regulators multiple sites* Banvel, Crossbow, 2,4-D, MCPA, Stinger
Amino acid synthesis ALS synthase Accent, Ally, Beacon, Classic, Express, Harmony Extra, Permit, Pinnacle, Pursuit, Python, Scepter,
EPSP synthase Rodeo, Roundup, Touchdown
Lipid inhibitors ACCase enzyme Assure II, Fusilade, Fusion, Hoelon, Poast, Select,
N-metabolism disruptors GS enzyme Liberty
Seedling root inhibitors tubulin protein Balan, Prowl, Sonalan, Treflan
Seedling shoot inhibitors multiple sites * Dual, Eptam, Eradicane,
Harness, Lasso, Outlook, Ramrod, Surpass,
Sutan+
Photosynthesis inhibitors D-1 quinone protein Atrazine, Basagran, Buctril,
Laddok, Lexone, Lorox,
Princep, Sencor, Sinbar, Spike, Velpar
Cell membrane disrupters Photosystem I Gramoxone, Diquat
PPO Authority, Blazer, Cobra, Reflex, Resource
Pigment inhibitors Carotenoid biosynthesis Command, Balance, Callisto
* Herbicides with multiple sites of action are less likely to select for herbicide-resistant weeds.