Tarzec® 320 WG (Reg. No. L10760) is a combination of Arylex® (halauxifen-methyl), a synthetic auxin-type herbicide (Group O) and Pyroxsulam, an ALS (AcetoLactate Synthase) enzyme inhibiting herbicide (Group B). This product controls plants by disrupting normal growth patterns and / or by inhibiting production of the enzyme essential for production of certain amino acids needed for normal plant growth.