Herbicide Sites of Action

Enter the site of action for each herbicide group. All groups with multiple group #s must be specified with exception of photosynthesis inhibitors.

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Last updated: March 30, 2026

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Hint	Answer
Group 22	Cell Membrane Disrupter (Photosystem I electron diverter)
Group 12	Pigment Inhibitor (phytoene desaturase inhibitor)
Group 2	Amino Acid (EPSP) Inhibitor
Group 8	Seedling Shoot Growth Inhibitors (Lipid synthesis inhibitor)
Group 19	Growth Regulators (auxin transport inhibitor)
Group 10	Nitrogen Metabolism Inhibitor
Group 6	Photosynthesis Inhibitors
Group 14	Cell Membrane Disrupter (PPO inhibitor)
Group 9	Amino Acid (ALS) Inhibitor
Group 1	Lipid Synthesis Inhibitor
Group 7	Photosynthesis Inhibitors
Group 16	Seedling Shoot Growth Inhibitors (specific site unkown)
Group 15	Seedling Shoot Growth Inhibitors (Long-chain fatty acid inhibitor)
Group 4	Growth Regulators (T1R1 auxin receptor)
Group 5	Photosynthesis Inhibitors
Group 3	Seedling Root Growth Inhibitor
Group 27	Pigment Inhibitor (HPPD inhibitor)
Group 13	Pigment Inhibitor (DOXP synthase inhibitor)

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