Postemergence
clethodim (SelectMax and other trade names)
Rate Annual grasses: use 0.068 to 0.121 lb ai/A (9 to 16 oz/A SelectMax); perennial grasses: use 0.091 to 0.242 lb ai/A (12 to 32 oz/A SelectMax)
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 Postemergence to grasses. See label for details.
Remarks Controls annual and perennial grasses. Always use a nonionic surfactant at 1 quart/100 gal or a petroleum-based crop oil at 1 gal/100 gal.
Caution Do not exceed 14 oz/A per season. Preharvest interval is 60 days. Do not feed vines or hay.
Site of action Group 1: acetyl CoA carboxylase (ACCase) inhibitor
Chemical family Aryloxyphenoxy propionate
sethoxydim (Poast and other trade names)
Rate 0.19 to 0.47 lb ai/A (1 to 2.5 pints/A Poast)
Time Apply to wild oat and volunteer cereals up to 4 inches tall, and to other grasses according to label.
Remarks Refer to label for specific herbicide rates, weed species, and weed size. Always add nonphytotoxic oil concentrate at 2 pints/A.
Caution Control is erratic on grasses stressed by drought, temperature extremes, herbicide injury, or other factors. Do not apply if rain is expected within 1 hour of application. Do not mix with other pesticides. Do not exceed 0.75 lb ai/A in one season. Preharvest interval is 50 days.
Site of action Group 1: acetyl CoA carboxylase (ACCase) inhibitor
Chemical family Cyclohexanedione