Postemergence
clethodim (Select Max and other trade names)
Rate Annual grasses: use 0.068 to 0.121 lb ai/A (9 to 16 oz/A Select Max); perennial grasses: use 0.091 to 0.242 lb ai/A (12 to 32 oz/A Select Max)
Time Apply postemergence to actively growing grasses. See label for details.
Remarks Apply with an approved nonionic surfactant at 0.25% v/v.
Caution Do not exceed 32 oz/A per application or 64 oz/A per year. Preharvest interval is 30 days. Allow at least 14 days between re-treatments.
Site of action Group 1: acetyl CoA carboxylase (ACCase) inhibitor
Chemical family Cyclohexanedione
quizalofop-P (Assure II and other trade names)
Rate 0.04 to 0.08 lb ai/A (6 to 12 oz/A Assure II)
Time After grasses emerge; see label for details.
Remarks Controls annual and perennial grasses. Always use either a nonionic surfactant at 1 quart/100 gal or a petroleum-based crop oil at 1 gal/100 gal.
Caution Do not exceed 24 oz/A per season. Preharvest interval is 30 days. Do not feed vines or hay.
Site of action Group 1: acetyl CoA carboxylase (ACCase) inhibitor
Chemical family Aryloxyphenoxypropionate
sethoxydim (Poast and other trade names)
Rate 0.281 to 0.468 lb ai/A (1.5 to 2.5 pints/A)
Time Apply postemergence to actively growing weeds.
Remarks Add crop oil concentrate or methylated seed oil and liquid urea ammonium nitrate fertilizer or ammonium sulfate as adjuvants. See label for more information on adjuvants and tank-mixes. Apply to most grasses when 4 to 8 inches tall. Refer to label for specific weed recommendations and other restrictions.
Caution Do not apply to grasses or crops under moisture stress.
Site of action Group 1: acetyl CoA carboxylase (ACCase) inhibitor
Chemical family Cyclohexanedione